1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638 3639 3640 3641 3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665 3666 3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716 3717 3718 3719 3720 3721 3722 3723 3724 3725 3726 3727 3728 3729 3730 3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819 3820 3821 3822 3823 3824 3825 3826 3827 3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 3884 3885 3886 3887 3888 3889 3890 3891 3892 3893 3894 3895 3896 3897 3898 3899 3900 3901 3902 3903 3904 3905 3906 3907 3908 3909 3910 3911 3912 3913 3914 3915 3916 3917 3918 3919 3920 3921 3922 3923 3924 3925 3926 3927 3928 3929 3930 3931 3932 3933 3934 3935 3936 3937 3938 3939 3940 3941 3942 3943 3944 3945 3946 3947 3948 3949 3950 3951 3952 3953 3954 3955 3956 3957 3958 3959 3960 3961 3962 3963 3964 3965 3966 3967 3968 3969 3970 3971 3972 3973 3974 3975 3976 3977 3978 3979 3980 3981 3982 3983 3984 3985 3986 3987 3988 3989 3990 3991 3992 3993 3994 3995 3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008 4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048 4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065 4066 4067 4068 4069 4070 4071 4072 4073 4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085 4086 4087 4088 4089 4090 4091 4092 4093 4094 4095 4096 4097 4098 4099 4100 4101 4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115 4116 4117 4118 4119 4120 4121 4122 4123 4124 4125 4126 4127 4128 4129 4130 4131 4132 4133 4134 4135 4136 4137 4138 4139 4140 4141 4142 4143 4144 4145 4146 4147 4148 4149 4150 4151 4152 4153 4154 4155 4156 4157 4158 4159 4160 4161 4162 4163 4164 4165 4166 4167 4168 4169 4170 4171 4172 4173 4174 4175 4176 4177 4178 4179 4180 4181 4182 4183 4184 4185 4186 4187 4188 4189 4190 4191 4192 4193 4194 4195 4196 4197 4198 4199 4200 4201 4202 4203 4204 4205 4206 4207 4208 4209 4210 4211 4212 4213 4214 4215 4216 4217 4218 4219 4220 4221 4222 4223 4224 4225 4226 4227 4228 4229 4230 4231 4232 4233 4234 4235 4236 4237 4238 4239 4240 4241 4242 4243 4244 4245 4246 4247 4248 4249 4250 4251 4252 4253 4254 4255 4256 4257 4258 4259 4260 4261 4262 4263 4264 4265 4266 4267 4268 4269 4270 4271 4272 4273 4274 4275 4276 4277 4278 4279 4280 4281 4282 4283 4284 4285 4286 4287 4288 4289 4290 4291 4292 4293 4294 4295 4296 4297 4298 4299 4300 4301 4302 4303 4304 4305 4306 4307 4308 4309 4310 4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322 4323 4324 4325 4326 4327 4328 4329 4330 4331 4332 4333 4334 4335 4336 4337 4338 4339 4340 4341 4342 4343 4344 4345 4346 4347 4348 4349 4350 4351 4352 4353 4354 4355 4356 4357 4358 4359 4360 4361 4362 4363 4364 4365 4366 4367 4368 4369 4370 4371 4372 4373 4374 4375 4376 4377 4378 4379 4380 4381 4382 4383 4384 4385 4386 4387 4388 4389 4390 4391 4392 4393 4394 4395 4396 4397 4398 4399 4400 4401 4402 4403 4404 4405 4406 4407 4408 4409 4410 4411 4412 4413 4414 4415 4416 4417 4418 4419 4420 4421 4422 4423 4424 4425 4426 4427 4428 4429 4430 4431 4432 4433 4434 4435 4436 4437 4438 4439 4440 4441 4442 4443 4444 4445 4446 4447 4448 4449 4450 4451 4452 4453 4454 4455 4456 4457 4458 4459 4460 4461 4462 4463 4464 4465 4466 4467 4468 4469 4470 4471 4472 4473 4474 4475 4476 4477 4478 4479 4480 4481 4482 4483 4484 4485 4486 4487 4488 4489 4490 4491 4492 4493 4494 4495 4496 4497 4498 4499 4500 4501 4502 4503 4504 4505 4506 4507 4508 4509 4510 4511 4512 4513 4514 4515 4516 4517 4518 4519 4520 4521 4522 4523 4524 4525 4526 4527 4528 4529 4530 4531 4532 4533 4534 4535 4536 4537 4538 4539 4540 4541 4542 4543 4544 4545 4546 4547 4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558 4559 4560 4561 4562 4563 4564 4565 4566 4567 4568 4569 4570 4571 4572 4573 4574 4575 4576 4577 4578 4579 4580 4581 4582 4583 4584 4585 4586 4587 4588 4589 4590 4591 4592 4593 4594 4595 4596 4597 4598 4599 4600 4601 4602 4603 4604 4605 4606 4607 4608 4609 4610 4611 4612 4613 4614 4615 4616 4617 4618 4619 4620 4621 4622 4623 4624 4625 4626 4627 4628 4629 4630 4631 4632 4633 4634 4635 4636 4637 4638 4639 4640 4641 4642 4643 4644 4645 4646 4647 4648 4649 4650 4651 4652 4653 4654 4655 4656 4657 4658 4659 4660 4661 4662 4663 4664 4665 4666 4667 4668 4669 4670 4671 4672 4673 4674 4675 4676 4677 4678 4679 4680 4681 4682 4683 4684 4685 4686 4687 4688 4689 4690 4691 4692 4693 4694 4695 4696 4697 4698 4699 4700 4701 4702 4703 4704 4705 4706 4707 4708 4709 4710 4711 4712 4713 4714 4715 4716 4717 4718 4719 4720 4721 4722 4723 4724 4725 4726 4727 4728 4729 4730 4731 4732 4733 4734 4735 4736 4737 4738 4739 4740 4741 4742 4743 4744 4745 4746 4747 4748 4749 4750 4751 4752 4753 4754 4755 4756 4757 4758 4759 4760 4761 4762 4763 4764 4765 4766 4767 4768 4769 4770 4771 4772 4773 4774 4775 4776 4777 4778 4779 4780 4781 4782 4783 4784 4785 4786 4787 4788 4789 4790 4791 4792 4793 4794 4795 4796 4797 4798 4799 4800 4801 4802 4803 4804 4805 4806 4807 4808 4809 4810 4811 4812 4813 4814 4815 4816 4817 4818 4819 4820 4821 4822 4823 4824 4825 4826 4827 4828 4829 4830 4831 4832 4833 4834 4835 4836 4837 4838 4839 4840 4841 4842 4843 4844 4845 4846 4847 4848 4849 4850 4851 4852 4853 4854 4855 4856 4857 4858 4859 4860 4861 4862 4863 4864 4865 4866 4867 4868 4869 4870 4871 4872 4873 4874 4875 4876 4877 4878 4879 4880 4881 4882 4883 4884 4885 4886 4887 4888 4889 4890 4891 4892 4893 4894 4895 4896 4897 4898 4899 4900 4901 4902 4903 4904 4905 4906 4907 4908 4909 4910 4911 4912 4913 4914 4915 4916 4917 4918 4919 4920 4921 4922 4923 4924 4925 4926 4927 4928 4929 4930 4931 4932 4933 4934 4935 4936 4937 4938 4939 4940 4941 4942 4943 4944 4945 4946 4947 4948 4949 4950 4951 4952 4953 4954 4955 4956 4957 4958 4959 4960 4961 4962 4963 4964 4965 4966 4967 4968 4969 4970 4971 4972 4973 4974 4975 4976 4977 4978 4979 4980 4981 4982 4983 4984 4985 4986 4987 4988 4989 4990 4991 4992 4993 4994 4995 4996 4997 4998 4999 5000 5001 5002 5003 5004 5005 5006 5007 5008 5009 5010 5011 5012 5013 5014 5015 5016 5017 5018 5019 5020 5021 5022 5023 5024 5025 5026 5027 5028 5029 5030 5031 5032 5033 5034 5035 5036 5037 5038 5039 5040 5041 5042 5043 5044 5045 5046 5047 5048 5049 5050 5051 5052 5053 5054 5055 5056 5057 5058 5059 5060 5061 5062 5063 5064 5065 5066 5067 5068 5069 5070 5071 5072 5073 5074 5075 5076 5077 5078 5079 5080 5081 5082 5083 5084 5085 5086 5087 5088 5089 5090 5091 5092 5093 5094 5095 5096 5097 5098 5099 5100 5101 5102 5103 5104 5105 5106 5107 5108 5109 5110 5111 5112 5113 5114 5115 5116 5117 5118 5119 5120 5121 5122 5123 5124 5125 5126 5127 5128 5129 5130 5131 5132 5133 5134 5135 5136 5137 5138 5139 5140 5141 5142 5143 5144 5145 5146 5147 5148 5149 5150 5151 5152 5153 5154 5155 5156 5157 5158 5159 5160 5161 5162 5163 5164 5165 5166 5167 5168 5169 5170 5171 5172 5173 5174 5175 5176 5177 5178 5179 5180 5181 5182 5183 5184 5185 5186 5187 5188 5189 5190 5191 5192 5193 5194 5195 5196 5197 5198 5199 5200 5201 5202 5203 5204 5205 5206 5207 5208 5209 5210 5211 5212 5213 5214 5215 5216 5217 5218 5219 5220 5221 5222 5223 5224 5225 5226 5227 5228 5229 5230 5231 5232 5233 5234 5235 5236 5237 5238 5239 5240 5241 5242 5243 5244 5245 5246 5247 5248 5249 5250 5251 5252 5253 5254 5255 5256 5257 5258 5259 5260 5261 5262 5263 5264 5265 5266 5267 5268 5269 5270 5271 5272 5273 5274 5275 5276 5277 5278 5279 5280 5281 5282 5283 5284 5285 5286 5287 5288 5289 5290 5291 5292 5293 5294 5295 5296 5297 5298 5299 5300 5301 5302 5303 5304 5305 5306 5307 5308 5309 5310 5311 5312 5313 5314 5315 5316 5317 5318 5319 5320 5321 5322 5323 5324 5325 5326 5327 5328 5329 5330 5331 5332 5333 5334 5335 5336 5337 5338 5339 5340 5341 5342 5343 5344 5345 5346 5347 5348 5349 5350 5351 5352 5353 5354 5355 5356 5357 5358 5359 5360 5361 5362 5363 5364 5365 5366 5367 5368 5369 5370 5371 5372 5373 5374 5375 5376 5377 5378 5379 5380 5381 5382 5383 5384 5385 5386 5387 5388 5389 5390 5391 5392 5393 5394 5395 5396 5397 5398 5399 5400 5401 5402 5403 5404 5405 5406 5407 5408 5409 5410 5411 5412 5413 5414 5415 5416 5417 5418 5419 5420 5421 5422 5423 5424 5425 5426 5427 5428 5429 5430 5431 5432 5433 5434 5435 5436 5437 5438 5439 5440 5441 5442 5443 5444 5445 5446 5447 5448 5449 5450 5451 5452 5453 5454 5455 5456 5457 5458 5459 5460 5461 5462 5463 5464 5465 5466 5467 5468 5469 5470 5471 5472 5473 5474 5475 5476 5477 5478 5479 5480 5481 5482 5483 5484 5485 5486 5487 5488 5489 5490 5491 5492 5493 5494 5495 5496 5497 5498 5499 5500 5501 5502 5503 5504 5505 5506 5507 5508 5509 5510 5511 5512 5513 5514 5515 5516 5517 5518 5519 5520 5521 5522 5523 5524 5525 5526 5527 5528 5529 5530 5531 5532 5533 5534 5535 5536 5537 5538 5539 5540 5541 5542 5543 5544 5545 5546 5547 5548 5549 5550 5551 5552 5553 5554 5555 5556 5557 5558 5559 5560 5561 5562 5563 5564 5565 5566 5567 5568 5569 5570 5571 5572 5573 5574 5575 5576 5577 5578 5579 5580 5581 5582 5583 5584 5585 5586 5587 5588 5589 5590 5591 5592 5593 5594 5595 5596 5597 5598 5599 5600 5601 5602 5603 5604 5605 5606 5607 5608 5609 5610 5611 5612 5613 5614 5615 5616 5617 5618 5619 5620 5621 5622 5623 5624 5625 5626 5627 5628 5629 5630 5631 5632 5633 5634 5635 5636 5637 5638 5639 5640 5641 5642 5643 5644 5645 5646 5647 5648 5649 5650 5651 5652 5653 5654 5655 5656 5657 5658 5659 5660 5661 5662 5663 5664 5665 5666 5667 5668 5669 5670 5671 5672 5673 5674 5675 5676 5677 5678 5679 5680 5681 5682 5683 5684 5685 5686 5687 5688 5689 5690 5691 5692 5693 5694 5695 5696 5697 5698 5699 5700 5701 5702 5703 5704 5705 5706 5707 5708 5709 5710 5711 5712 5713 5714 5715 5716 5717 5718 5719 5720 5721 5722 5723 5724 5725 5726 5727 5728 5729 5730 5731 5732 5733 5734 5735 5736 5737 5738 5739 5740 5741 5742 5743 5744 5745 5746 5747 5748 5749 5750 5751 5752 5753 5754 5755 5756 5757 5758 5759 5760 5761 5762 5763 5764 5765 5766 5767 5768 5769 5770 5771 5772 5773 5774 5775 5776 5777 5778 5779 5780 5781 5782 5783 5784 5785 5786 5787 5788 5789 5790 5791 5792 5793 5794 5795 5796 5797 5798 5799 5800 5801 5802 5803 5804 5805 5806 5807 5808 5809 5810 5811 5812 5813 5814 5815 5816 5817 5818 5819 5820 5821 5822 5823 5824 5825 5826 5827 5828 5829 5830 5831 5832 5833 5834 5835 5836 5837 5838 5839 5840 5841 5842 5843 5844 5845 5846 5847 5848 5849 5850 5851 5852 5853 5854 5855 5856 5857 5858 5859 5860 5861 5862 5863 5864 5865 5866 5867 5868 5869 5870 5871 5872 5873 5874 5875 5876 5877 5878 5879 5880 5881 5882 5883 5884 5885 5886 5887 5888 5889 5890 5891 5892 5893 5894 5895 5896 5897 5898 5899 5900 5901 5902 5903 5904 5905 5906 5907 5908 5909 5910 5911 5912 5913 5914 5915 5916 5917 5918 5919 5920 5921 5922 5923 5924 5925 5926 5927 5928 5929 5930 5931 5932 5933 5934 5935 5936 5937 5938 5939 5940 5941 5942 5943 5944 5945 5946 5947 5948 5949 5950 5951 5952 5953 5954 5955 5956 5957 5958 5959 5960 5961 5962 5963 5964 5965 5966 5967 5968 5969 5970 5971 5972 5973 5974 5975 5976 5977 5978 5979 5980 5981 5982 5983 5984 5985 5986 5987 5988 5989 5990 5991 5992 5993 5994 5995 5996 5997 5998 5999 6000 6001 6002 6003 6004 6005 6006 6007 6008 6009 6010 6011 6012 6013 6014 6015 6016 6017 6018 6019 6020 6021 6022 6023 6024 6025 6026 6027 6028 6029 6030 6031 6032 6033 6034 6035 6036 6037 6038 6039 6040 6041 6042 6043 6044 6045 6046 6047 6048 6049 6050 6051 6052 6053 6054 6055 6056 6057 6058 6059 6060 6061 6062 6063 6064 6065 6066 6067 6068 6069 6070 6071 6072 6073 6074 6075 6076 6077 6078 6079 6080 6081 6082 6083 6084 6085 6086 6087 6088 6089 6090 6091 6092 6093 6094 6095 6096 6097 6098 6099 6100 6101 6102 6103 6104 6105 6106 6107 6108 6109 6110 6111 6112 6113 6114 6115 6116 6117 6118 6119 6120 6121 6122 6123 6124 6125 6126 6127 6128 6129 6130 6131 6132 6133 6134 6135 6136 6137 6138 6139 6140 6141 6142 6143 6144 6145 6146 6147 6148 6149 6150 6151 6152 6153 6154 6155 6156 6157 6158 6159 6160 6161 6162 6163 6164 6165 6166 6167 6168 6169 6170 6171 6172 6173 6174 6175 6176 6177 6178 6179 6180 6181 6182 6183 6184 6185 6186 6187 6188 6189 6190 6191 6192 6193 6194 6195 6196 6197 6198 6199 6200 6201 6202 6203 6204 6205 6206 6207 6208 6209 6210 6211 6212 6213 6214 6215 6216 6217 6218 6219 6220 6221 6222 6223 6224 6225 6226 6227 6228 6229 6230 6231 6232 6233 6234 6235 6236 6237 6238 6239 6240 6241 6242 6243 6244 6245 6246 6247 6248 6249 6250 6251 6252 6253 6254 6255 6256 6257 6258 6259 6260 6261 6262 6263 6264 6265 6266 6267 6268 6269 6270 6271 6272 6273 6274 6275 6276 6277 6278 6279 6280 6281 6282 6283 6284 6285 6286 6287 6288 6289 6290 6291 6292 6293 6294 6295 6296 6297 6298 6299 6300 6301 6302 6303 6304 6305 6306 6307 6308 6309 6310 6311 6312 6313 6314 6315 6316 6317 6318 6319 6320 6321 6322 6323 6324 6325 6326 6327 6328 6329 6330 6331 6332 6333 6334 6335 6336 6337 6338 6339 6340 6341 6342 6343 6344 6345 6346 6347 6348 6349 6350 6351 6352 6353 6354 6355 6356 6357 6358 6359 6360 6361 6362 6363 6364 6365 6366 6367 6368 6369 6370 6371 6372 6373 6374 6375 6376 6377 6378 6379 6380 6381 6382 6383 6384 6385 6386 6387 6388 6389 6390 6391 6392 6393 6394 6395 6396 6397 6398 6399 6400 6401 6402 6403 6404 6405 6406 6407 6408 6409 6410 6411 6412 6413 6414 6415 6416 6417 6418 6419 6420 6421 6422 6423 6424 6425 6426 6427 6428 6429 6430 6431 6432 6433 6434 6435 6436 6437 6438 6439 6440 6441 6442 6443 6444 6445 6446 6447 6448 6449 6450 6451 6452 6453 6454 6455 6456 6457 6458 6459 6460 6461 6462 6463 6464 6465 6466 6467 6468 6469 6470 6471 6472 6473 6474 6475 6476 6477 6478 6479 6480 6481 6482 6483 6484 6485 6486 6487 6488 6489 6490 6491 6492 6493 6494 6495 6496 6497 6498 6499 6500 6501 6502 6503 6504 6505 6506 6507 6508 6509 6510 6511 6512 6513 6514 6515 6516 6517 6518 6519 6520 6521 6522 6523 6524 6525 6526 6527 6528 6529 6530 6531 6532 6533 6534 6535 6536 6537 6538 6539 6540 6541 6542 6543 6544 6545 6546 6547 6548 6549 6550 6551 6552 6553 6554 6555 6556 6557 6558 6559 6560 6561 6562 6563 6564 6565 6566 6567 6568 6569 6570 6571 6572 6573 6574 6575 6576 6577 6578 6579 6580 6581 6582 6583 6584 6585 6586 6587 6588 6589 6590 6591 6592 6593 6594 6595 6596 6597 6598 6599 6600 6601 6602 6603 6604 6605 6606 6607 6608 6609 6610 6611 6612 6613 6614 6615 6616 6617 6618 6619 6620 6621 6622 6623 6624 6625 6626 6627 6628 6629 6630 6631 6632 6633 6634 6635 6636 6637 6638 6639 6640 6641 6642 6643 6644 6645 6646 6647 6648 6649 6650 6651 6652 6653 6654 6655 6656 6657 6658 6659 6660 6661 6662 6663 6664 6665 6666 6667 6668 6669 6670 6671 6672 6673 6674 6675 6676 6677 6678 6679 6680 6681 6682 6683 6684 6685 6686 6687 6688 6689 6690 6691 6692 6693 6694 6695 6696 6697 6698 6699 6700 6701 6702 6703 6704 6705 6706 6707 6708 6709 6710 6711 6712 6713 6714 6715 6716 6717 6718 6719 6720 6721 6722 6723 6724 6725 6726 6727 6728 6729 6730 6731 6732 6733 6734 6735 6736 6737 6738 6739 6740 6741 6742 6743 6744 6745 6746 6747 6748 6749 6750 6751 6752 6753 6754 6755 6756 6757 6758 6759 6760 6761 6762 6763 6764 6765 6766 6767 6768 6769 6770 6771 6772 6773 6774 6775 6776 6777 6778 6779 6780 6781 6782 6783 6784 6785 6786 6787 6788 6789 6790 6791 6792 6793 6794 6795 6796 6797 6798 6799 6800 6801 6802 6803 6804 6805 6806 6807 6808 6809 6810 6811 6812 6813 6814 6815 6816 6817 6818 6819 6820 6821 6822 6823 6824 6825 6826 6827 6828 6829 6830 6831 6832 6833 6834 6835 6836 6837 6838 6839 6840 6841 6842 6843 6844 6845 6846 6847 6848 6849 6850 6851 6852 6853 6854 6855 6856 6857 6858 6859 6860 6861 6862 6863 6864 6865 6866 6867 6868 6869 6870 6871
|
/* Copyright (c) 2000, 2013, Oracle and/or its affiliates.
Copyright (c) 2008, 2014, SkySQL Ab.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
/**
@addtogroup Replication
@{
@file
@brief Code to run the io thread and the sql thread on the
replication slave.
*/
#include <my_global.h>
#include "sql_priv.h"
#include "slave.h"
#include "sql_parse.h" // execute_init_command
#include "sql_table.h" // mysql_rm_table
#include "rpl_mi.h"
#include "rpl_rli.h"
#include "sql_repl.h"
#include "rpl_filter.h"
#include "repl_failsafe.h"
#include "transaction.h"
#include <thr_alarm.h>
#include <my_dir.h>
#include <sql_common.h>
#include <errmsg.h>
#include <mysqld_error.h>
#include <mysys_err.h>
#include "rpl_handler.h"
#include <signal.h>
#include <mysql.h>
#include <myisam.h>
#include "sql_base.h" // close_thread_tables
#include "tztime.h" // struct Time_zone
#include "log_event.h" // Rotate_log_event,
// Create_file_log_event,
// Format_description_log_event
#ifdef HAVE_REPLICATION
#include "rpl_tblmap.h"
#include "debug_sync.h"
#include "rpl_parallel.h"
#define FLAGSTR(V,F) ((V)&(F)?#F" ":"")
#define MAX_SLAVE_RETRY_PAUSE 5
/*
a parameter of sql_slave_killed() to defer the killed status
*/
#define SLAVE_WAIT_GROUP_DONE 60
bool use_slave_mask = 0;
MY_BITMAP slave_error_mask;
char slave_skip_error_names[SHOW_VAR_FUNC_BUFF_SIZE];
char* slave_load_tmpdir = 0;
Master_info *active_mi= 0;
Master_info_index *master_info_index;
my_bool replicate_same_server_id;
ulonglong relay_log_space_limit = 0;
LEX_STRING default_master_connection_name= { (char*) "", 0 };
/*
When slave thread exits, we need to remember the temporary tables so we
can re-use them on slave start.
TODO: move the vars below under Master_info
*/
int disconnect_slave_event_count = 0, abort_slave_event_count = 0;
static pthread_key(Master_info*, RPL_MASTER_INFO);
enum enum_slave_reconnect_actions
{
SLAVE_RECON_ACT_REG= 0,
SLAVE_RECON_ACT_DUMP= 1,
SLAVE_RECON_ACT_EVENT= 2,
SLAVE_RECON_ACT_MAX
};
enum enum_slave_reconnect_messages
{
SLAVE_RECON_MSG_WAIT= 0,
SLAVE_RECON_MSG_KILLED_WAITING= 1,
SLAVE_RECON_MSG_AFTER= 2,
SLAVE_RECON_MSG_FAILED= 3,
SLAVE_RECON_MSG_COMMAND= 4,
SLAVE_RECON_MSG_KILLED_AFTER= 5,
SLAVE_RECON_MSG_MAX
};
static const char *reconnect_messages[SLAVE_RECON_ACT_MAX][SLAVE_RECON_MSG_MAX]=
{
{
"Waiting to reconnect after a failed registration on master",
"Slave I/O thread killed while waitnig to reconnect after a failed \
registration on master",
"Reconnecting after a failed registration on master",
"failed registering on master, reconnecting to try again, \
log '%s' at position %s%s",
"COM_REGISTER_SLAVE",
"Slave I/O thread killed during or after reconnect"
},
{
"Waiting to reconnect after a failed binlog dump request",
"Slave I/O thread killed while retrying master dump",
"Reconnecting after a failed binlog dump request",
"failed dump request, reconnecting to try again, log '%s' at position %s%s",
"COM_BINLOG_DUMP",
"Slave I/O thread killed during or after reconnect"
},
{
"Waiting to reconnect after a failed master event read",
"Slave I/O thread killed while waiting to reconnect after a failed read",
"Reconnecting after a failed master event read",
"Slave I/O thread: Failed reading log event, reconnecting to retry, \
log '%s' at position %s%s",
"",
"Slave I/O thread killed during or after a reconnect done to recover from \
failed read"
}
};
typedef enum { SLAVE_THD_IO, SLAVE_THD_SQL} SLAVE_THD_TYPE;
static int process_io_rotate(Master_info* mi, Rotate_log_event* rev);
static int process_io_create_file(Master_info* mi, Create_file_log_event* cev);
static bool wait_for_relay_log_space(Relay_log_info* rli);
static bool io_slave_killed(Master_info* mi);
static bool sql_slave_killed(rpl_group_info *rgi);
static int init_slave_thread(THD* thd, Master_info *mi,
SLAVE_THD_TYPE thd_type);
static void print_slave_skip_errors(void);
static int safe_connect(THD* thd, MYSQL* mysql, Master_info* mi);
static int safe_reconnect(THD* thd, MYSQL* mysql, Master_info* mi,
bool suppress_warnings);
static int connect_to_master(THD* thd, MYSQL* mysql, Master_info* mi,
bool reconnect, bool suppress_warnings);
static Log_event* next_event(rpl_group_info* rgi, ulonglong *event_size);
static int queue_event(Master_info* mi,const char* buf,ulong event_len);
static int terminate_slave_thread(THD *thd,
mysql_mutex_t *term_lock,
mysql_cond_t *term_cond,
volatile uint *slave_running,
bool skip_lock);
static bool check_io_slave_killed(Master_info *mi, const char *info);
static bool send_show_master_info_header(THD *thd, bool full,
size_t gtid_pos_length);
static bool send_show_master_info_data(THD *thd, Master_info *mi, bool full,
String *gtid_pos);
/*
Function to set the slave's max_allowed_packet based on the value
of slave_max_allowed_packet.
@in_param thd Thread handler for slave
@in_param mysql MySQL connection handle
*/
static void set_slave_max_allowed_packet(THD *thd, MYSQL *mysql)
{
DBUG_ENTER("set_slave_max_allowed_packet");
// thd and mysql must be valid
DBUG_ASSERT(thd && mysql);
thd->variables.max_allowed_packet= slave_max_allowed_packet;
thd->net.max_packet_size= slave_max_allowed_packet;
/*
Adding MAX_LOG_EVENT_HEADER_LEN to the max_packet_size on the I/O
thread and the mysql->option max_allowed_packet, since a
replication event can become this much larger than
the corresponding packet (query) sent from client to master.
*/
thd->net.max_packet_size+= MAX_LOG_EVENT_HEADER;
/*
Skipping the setting of mysql->net.max_packet size to slave
max_allowed_packet since this is done during mysql_real_connect.
*/
mysql->options.max_allowed_packet=
slave_max_allowed_packet+MAX_LOG_EVENT_HEADER;
DBUG_VOID_RETURN;
}
/*
Find out which replications threads are running
SYNOPSIS
init_thread_mask()
mask Return value here
mi master_info for slave
inverse If set, returns which threads are not running
IMPLEMENTATION
Get a bit mask for which threads are running so that we can later restart
these threads.
RETURN
mask If inverse == 0, running threads
If inverse == 1, stopped threads
*/
void init_thread_mask(int* mask,Master_info* mi,bool inverse)
{
bool set_io = mi->slave_running, set_sql = mi->rli.slave_running;
register int tmp_mask=0;
DBUG_ENTER("init_thread_mask");
if (set_io)
tmp_mask |= SLAVE_IO;
if (set_sql)
tmp_mask |= SLAVE_SQL;
if (inverse)
tmp_mask^= (SLAVE_IO | SLAVE_SQL);
*mask = tmp_mask;
DBUG_VOID_RETURN;
}
/*
lock_slave_threads()
*/
void lock_slave_threads(Master_info* mi)
{
DBUG_ENTER("lock_slave_threads");
//TODO: see if we can do this without dual mutex
mysql_mutex_lock(&mi->run_lock);
mysql_mutex_lock(&mi->rli.run_lock);
DBUG_VOID_RETURN;
}
/*
unlock_slave_threads()
*/
void unlock_slave_threads(Master_info* mi)
{
DBUG_ENTER("unlock_slave_threads");
//TODO: see if we can do this without dual mutex
mysql_mutex_unlock(&mi->rli.run_lock);
mysql_mutex_unlock(&mi->run_lock);
DBUG_VOID_RETURN;
}
#ifdef HAVE_PSI_INTERFACE
static PSI_thread_key key_thread_slave_io, key_thread_slave_sql;
static PSI_thread_info all_slave_threads[]=
{
{ &key_thread_slave_io, "slave_io", PSI_FLAG_GLOBAL},
{ &key_thread_slave_sql, "slave_sql", PSI_FLAG_GLOBAL}
};
static void init_slave_psi_keys(void)
{
const char* category= "sql";
int count;
if (PSI_server == NULL)
return;
count= array_elements(all_slave_threads);
PSI_server->register_thread(category, all_slave_threads, count);
}
#endif /* HAVE_PSI_INTERFACE */
static bool slave_init_thread_running;
pthread_handler_t
handle_slave_init(void *arg __attribute__((unused)))
{
THD *thd;
my_thread_init();
thd= new THD;
thd->thread_stack= (char*) &thd; /* Set approximate stack start */
mysql_mutex_lock(&LOCK_thread_count);
thd->thread_id= thread_id++;
mysql_mutex_unlock(&LOCK_thread_count);
thd->system_thread = SYSTEM_THREAD_SLAVE_INIT;
thd->store_globals();
thd->security_ctx->skip_grants();
thd->set_command(COM_DAEMON);
thd_proc_info(thd, "Loading slave GTID position from table");
if (rpl_load_gtid_slave_state(thd))
sql_print_warning("Failed to load slave replication state from table "
"%s.%s: %u: %s", "mysql",
rpl_gtid_slave_state_table_name.str,
thd->get_stmt_da()->sql_errno(),
thd->get_stmt_da()->message());
mysql_mutex_lock(&LOCK_thread_count);
delete thd;
mysql_mutex_unlock(&LOCK_thread_count);
my_thread_end();
mysql_mutex_lock(&LOCK_slave_init);
slave_init_thread_running= false;
mysql_cond_broadcast(&COND_slave_init);
mysql_mutex_unlock(&LOCK_slave_init);
return 0;
}
/*
Start the slave init thread.
This thread is used to load the GTID state from mysql.gtid_slave_pos at
server start; reading from table requires valid THD, which is otherwise not
available during server init.
*/
static int
run_slave_init_thread()
{
pthread_t th;
slave_init_thread_running= true;
if (mysql_thread_create(key_thread_slave_init, &th, &connection_attrib,
handle_slave_init, NULL))
{
sql_print_error("Failed to create thread while initialising slave");
return 1;
}
mysql_mutex_lock(&LOCK_slave_init);
while (slave_init_thread_running)
mysql_cond_wait(&COND_slave_init, &LOCK_slave_init);
mysql_mutex_unlock(&LOCK_slave_init);
return 0;
}
/* Initialize slave structures */
int init_slave()
{
DBUG_ENTER("init_slave");
int error= 0;
#ifdef HAVE_PSI_INTERFACE
init_slave_psi_keys();
#endif
if (run_slave_init_thread())
return 1;
/*
This is called when mysqld starts. Before client connections are
accepted. However bootstrap may conflict with us if it does START SLAVE.
So it's safer to take the lock.
*/
mysql_mutex_lock(&LOCK_active_mi);
if (pthread_key_create(&RPL_MASTER_INFO, NULL))
goto err;
master_info_index= new Master_info_index;
if (!master_info_index || master_info_index->init_all_master_info())
{
sql_print_error("Failed to initialize multi master structures");
mysql_mutex_unlock(&LOCK_active_mi);
DBUG_RETURN(1);
}
if (!(active_mi= new Master_info(&default_master_connection_name,
relay_log_recovery)) ||
active_mi->error())
{
delete active_mi;
active_mi= 0;
goto err;
}
if (master_info_index->add_master_info(active_mi, FALSE))
{
delete active_mi;
active_mi= 0;
goto err;
}
if (global_rpl_thread_pool.init(opt_slave_parallel_threads))
return 1;
/*
If --slave-skip-errors=... was not used, the string value for the
system variable has not been set up yet. Do it now.
*/
if (!use_slave_mask)
{
print_slave_skip_errors();
}
/*
If master_host is not specified, try to read it from the master_info file.
If master_host is specified, create the master_info file if it doesn't
exists.
*/
if (init_master_info(active_mi,master_info_file,relay_log_info_file,
1, (SLAVE_IO | SLAVE_SQL)))
{
sql_print_error("Failed to initialize the master info structure");
goto err;
}
/* If server id is not set, start_slave_thread() will say it */
if (active_mi->host[0] && !opt_skip_slave_start)
{
if (start_slave_threads(1 /* need mutex */,
0 /* no wait for start*/,
active_mi,
master_info_file,
relay_log_info_file,
SLAVE_IO | SLAVE_SQL))
{
sql_print_error("Failed to create slave threads");
goto err;
}
}
end:
mysql_mutex_unlock(&LOCK_active_mi);
DBUG_RETURN(error);
err:
sql_print_error("Failed to allocate memory for the Master Info structure");
error= 1;
goto end;
}
/*
Updates the master info based on the information stored in the
relay info and ignores relay logs previously retrieved by the IO
thread, which thus starts fetching again based on to the
group_master_log_pos and group_master_log_name. Eventually, the old
relay logs will be purged by the normal purge mechanism.
In the feature, we should improve this routine in order to avoid throwing
away logs that are safely stored in the disk. Note also that this recovery
routine relies on the correctness of the relay-log.info and only tolerates
coordinate problems in master.info.
In this function, there is no need for a mutex as the caller
(i.e. init_slave) already has one acquired.
Specifically, the following structures are updated:
1 - mi->master_log_pos <-- rli->group_master_log_pos
2 - mi->master_log_name <-- rli->group_master_log_name
3 - It moves the relay log to the new relay log file, by
rli->group_relay_log_pos <-- BIN_LOG_HEADER_SIZE;
rli->event_relay_log_pos <-- BIN_LOG_HEADER_SIZE;
rli->group_relay_log_name <-- rli->relay_log.get_log_fname();
rli->event_relay_log_name <-- rli->relay_log.get_log_fname();
If there is an error, it returns (1), otherwise returns (0).
*/
int init_recovery(Master_info* mi, const char** errmsg)
{
DBUG_ENTER("init_recovery");
Relay_log_info *rli= &mi->rli;
if (rli->group_master_log_name[0])
{
mi->master_log_pos= MY_MAX(BIN_LOG_HEADER_SIZE,
rli->group_master_log_pos);
strmake_buf(mi->master_log_name, rli->group_master_log_name);
sql_print_warning("Recovery from master pos %ld and file %s.",
(ulong) mi->master_log_pos, mi->master_log_name);
strmake_buf(rli->group_relay_log_name, rli->relay_log.get_log_fname());
strmake_buf(rli->event_relay_log_name, rli->relay_log.get_log_fname());
rli->group_relay_log_pos= rli->event_relay_log_pos= BIN_LOG_HEADER_SIZE;
}
DBUG_RETURN(0);
}
/**
Convert slave skip errors bitmap into a printable string.
*/
static void print_slave_skip_errors(void)
{
/*
To be safe, we want 10 characters of room in the buffer for a number
plus terminators. Also, we need some space for constant strings.
10 characters must be sufficient for a number plus {',' | '...'}
plus a NUL terminator. That is a max 6 digit number.
*/
const size_t MIN_ROOM= 10;
DBUG_ENTER("print_slave_skip_errors");
DBUG_ASSERT(sizeof(slave_skip_error_names) > MIN_ROOM);
DBUG_ASSERT(MAX_SLAVE_ERROR <= 999999); // 6 digits
/* Make @@slave_skip_errors show the nice human-readable value. */
opt_slave_skip_errors= slave_skip_error_names;
if (!use_slave_mask || bitmap_is_clear_all(&slave_error_mask))
{
/* purecov: begin tested */
memcpy(slave_skip_error_names, STRING_WITH_LEN("OFF"));
/* purecov: end */
}
else if (bitmap_is_set_all(&slave_error_mask))
{
/* purecov: begin tested */
memcpy(slave_skip_error_names, STRING_WITH_LEN("ALL"));
/* purecov: end */
}
else
{
char *buff= slave_skip_error_names;
char *bend= buff + sizeof(slave_skip_error_names);
int errnum;
for (errnum= 0; errnum < MAX_SLAVE_ERROR; errnum++)
{
if (bitmap_is_set(&slave_error_mask, errnum))
{
if (buff + MIN_ROOM >= bend)
break; /* purecov: tested */
buff= int10_to_str(errnum, buff, 10);
*buff++= ',';
}
}
if (buff != slave_skip_error_names)
buff--; // Remove last ','
if (errnum < MAX_SLAVE_ERROR)
{
/* Couldn't show all errors */
buff= strmov(buff, "..."); /* purecov: tested */
}
*buff=0;
}
DBUG_PRINT("init", ("error_names: '%s'", slave_skip_error_names));
DBUG_VOID_RETURN;
}
/*
Init function to set up array for errors that should be skipped for slave
SYNOPSIS
init_slave_skip_errors()
arg List of errors numbers to skip, separated with ','
NOTES
Called from get_options() in mysqld.cc on start-up
*/
void init_slave_skip_errors(const char* arg)
{
const char *p;
DBUG_ENTER("init_slave_skip_errors");
if (my_bitmap_init(&slave_error_mask,0,MAX_SLAVE_ERROR,0))
{
fprintf(stderr, "Badly out of memory, please check your system status\n");
exit(1);
}
use_slave_mask = 1;
for (;my_isspace(system_charset_info,*arg);++arg)
/* empty */;
if (!my_strnncoll(system_charset_info,(uchar*)arg,4,(const uchar*)"all",4))
{
bitmap_set_all(&slave_error_mask);
print_slave_skip_errors();
DBUG_VOID_RETURN;
}
for (p= arg ; *p; )
{
long err_code;
if (!(p= str2int(p, 10, 0, LONG_MAX, &err_code)))
break;
if (err_code < MAX_SLAVE_ERROR)
bitmap_set_bit(&slave_error_mask,(uint)err_code);
while (!my_isdigit(system_charset_info,*p) && *p)
p++;
}
/* Convert slave skip errors bitmap into a printable string. */
print_slave_skip_errors();
DBUG_VOID_RETURN;
}
int terminate_slave_threads(Master_info* mi,int thread_mask,bool skip_lock)
{
DBUG_ENTER("terminate_slave_threads");
if (!mi->inited)
DBUG_RETURN(0); /* successfully do nothing */
int error,force_all = (thread_mask & SLAVE_FORCE_ALL);
mysql_mutex_t *sql_lock = &mi->rli.run_lock, *io_lock = &mi->run_lock;
mysql_mutex_t *log_lock= mi->rli.relay_log.get_log_lock();
if (thread_mask & (SLAVE_SQL|SLAVE_FORCE_ALL))
{
DBUG_PRINT("info",("Terminating SQL thread"));
if (opt_slave_parallel_threads > 0 &&
mi->rli.abort_slave && mi->rli.stop_for_until)
{
mi->rli.stop_for_until= false;
mi->rli.parallel.stop_during_until();
}
else
mi->rli.abort_slave=1;
if ((error=terminate_slave_thread(mi->rli.sql_driver_thd, sql_lock,
&mi->rli.stop_cond,
&mi->rli.slave_running,
skip_lock)) &&
!force_all)
DBUG_RETURN(error);
mysql_mutex_lock(log_lock);
DBUG_PRINT("info",("Flushing relay-log info file."));
if (current_thd)
THD_STAGE_INFO(current_thd, stage_flushing_relay_log_info_file);
if (flush_relay_log_info(&mi->rli))
DBUG_RETURN(ER_ERROR_DURING_FLUSH_LOGS);
if (my_sync(mi->rli.info_fd, MYF(MY_WME)))
DBUG_RETURN(ER_ERROR_DURING_FLUSH_LOGS);
mysql_mutex_unlock(log_lock);
}
if (thread_mask & (SLAVE_IO|SLAVE_FORCE_ALL))
{
DBUG_PRINT("info",("Terminating IO thread"));
mi->abort_slave=1;
if ((error=terminate_slave_thread(mi->io_thd, io_lock,
&mi->stop_cond,
&mi->slave_running,
skip_lock)) &&
!force_all)
DBUG_RETURN(error);
mysql_mutex_lock(log_lock);
DBUG_PRINT("info",("Flushing relay log and master info file."));
if (current_thd)
THD_STAGE_INFO(current_thd, stage_flushing_relay_log_and_master_info_repository);
if (flush_master_info(mi, TRUE, FALSE))
DBUG_RETURN(ER_ERROR_DURING_FLUSH_LOGS);
if (mi->rli.relay_log.is_open() &&
my_sync(mi->rli.relay_log.get_log_file()->file, MYF(MY_WME)))
DBUG_RETURN(ER_ERROR_DURING_FLUSH_LOGS);
if (my_sync(mi->fd, MYF(MY_WME)))
DBUG_RETURN(ER_ERROR_DURING_FLUSH_LOGS);
mysql_mutex_unlock(log_lock);
}
DBUG_RETURN(0);
}
/**
Wait for a slave thread to terminate.
This function is called after requesting the thread to terminate
(by setting @c abort_slave member of @c Relay_log_info or @c
Master_info structure to 1). Termination of the thread is
controlled with the the predicate <code>*slave_running</code>.
Function will acquire @c term_lock before waiting on the condition
unless @c skip_lock is true in which case the mutex should be owned
by the caller of this function and will remain acquired after
return from the function.
@param term_lock
Associated lock to use when waiting for @c term_cond
@param term_cond
Condition that is signalled when the thread has terminated
@param slave_running
Pointer to predicate to check for slave thread termination
@param skip_lock
If @c true the lock will not be acquired before waiting on
the condition. In this case, it is assumed that the calling
function acquires the lock before calling this function.
@retval 0 All OK ER_SLAVE_NOT_RUNNING otherwise.
@note If the executing thread has to acquire term_lock (skip_lock
is false), the negative running status does not represent
any issue therefore no error is reported.
*/
static int
terminate_slave_thread(THD *thd,
mysql_mutex_t *term_lock,
mysql_cond_t *term_cond,
volatile uint *slave_running,
bool skip_lock)
{
DBUG_ENTER("terminate_slave_thread");
if (!skip_lock)
{
mysql_mutex_lock(term_lock);
}
else
{
mysql_mutex_assert_owner(term_lock);
}
if (!*slave_running)
{
if (!skip_lock)
{
/*
if run_lock (term_lock) is acquired locally then either
slave_running status is fine
*/
mysql_mutex_unlock(term_lock);
DBUG_RETURN(0);
}
else
{
DBUG_RETURN(ER_SLAVE_NOT_RUNNING);
}
}
DBUG_ASSERT(thd != 0);
THD_CHECK_SENTRY(thd);
/*
Is is critical to test if the slave is running. Otherwise, we might
be referening freed memory trying to kick it
*/
while (*slave_running) // Should always be true
{
int error __attribute__((unused));
DBUG_PRINT("loop", ("killing slave thread"));
mysql_mutex_lock(&thd->LOCK_thd_data);
#ifndef DONT_USE_THR_ALARM
/*
Error codes from pthread_kill are:
EINVAL: invalid signal number (can't happen)
ESRCH: thread already killed (can happen, should be ignored)
*/
int err __attribute__((unused))= pthread_kill(thd->real_id, thr_client_alarm);
DBUG_ASSERT(err != EINVAL);
#endif
thd->awake(NOT_KILLED);
mysql_mutex_unlock(&thd->LOCK_thd_data);
/*
There is a small chance that slave thread might miss the first
alarm. To protect againts it, resend the signal until it reacts
*/
struct timespec abstime;
set_timespec(abstime,2);
error= mysql_cond_timedwait(term_cond, term_lock, &abstime);
DBUG_ASSERT(error == ETIMEDOUT || error == 0);
}
DBUG_ASSERT(*slave_running == 0);
if (!skip_lock)
mysql_mutex_unlock(term_lock);
DBUG_RETURN(0);
}
int start_slave_thread(
#ifdef HAVE_PSI_INTERFACE
PSI_thread_key thread_key,
#endif
pthread_handler h_func, mysql_mutex_t *start_lock,
mysql_mutex_t *cond_lock,
mysql_cond_t *start_cond,
volatile uint *slave_running,
volatile ulong *slave_run_id,
Master_info* mi)
{
pthread_t th;
ulong start_id;
int error;
DBUG_ENTER("start_slave_thread");
DBUG_ASSERT(mi->inited);
if (start_lock)
mysql_mutex_lock(start_lock);
if (!global_system_variables.server_id)
{
if (start_cond)
mysql_cond_broadcast(start_cond);
if (start_lock)
mysql_mutex_unlock(start_lock);
sql_print_error("Server id not set, will not start slave");
DBUG_RETURN(ER_BAD_SLAVE);
}
if (*slave_running)
{
if (start_cond)
mysql_cond_broadcast(start_cond);
if (start_lock)
mysql_mutex_unlock(start_lock);
DBUG_RETURN(ER_SLAVE_MUST_STOP);
}
start_id= *slave_run_id;
DBUG_PRINT("info",("Creating new slave thread"));
if ((error = mysql_thread_create(thread_key,
&th, &connection_attrib, h_func, (void*)mi)))
{
sql_print_error("Can't create slave thread (errno= %d).", error);
if (start_lock)
mysql_mutex_unlock(start_lock);
DBUG_RETURN(ER_SLAVE_THREAD);
}
if (start_cond && cond_lock) // caller has cond_lock
{
THD* thd = current_thd;
while (start_id == *slave_run_id)
{
DBUG_PRINT("sleep",("Waiting for slave thread to start"));
PSI_stage_info saved_stage= {0, "", 0};
thd->ENTER_COND(start_cond, cond_lock,
& stage_waiting_for_slave_thread_to_start,
& saved_stage);
/*
It is not sufficient to test this at loop bottom. We must test
it after registering the mutex in enter_cond(). If the kill
happens after testing of thd->killed and before the mutex is
registered, we could otherwise go waiting though thd->killed is
set.
*/
if (!thd->killed)
mysql_cond_wait(start_cond, cond_lock);
thd->EXIT_COND(& saved_stage);
mysql_mutex_lock(cond_lock); // re-acquire it as exit_cond() released
if (thd->killed)
{
if (start_lock)
mysql_mutex_unlock(start_lock);
DBUG_RETURN(thd->killed_errno());
}
}
}
if (start_lock)
mysql_mutex_unlock(start_lock);
DBUG_RETURN(0);
}
/*
start_slave_threads()
NOTES
SLAVE_FORCE_ALL is not implemented here on purpose since it does not make
sense to do that for starting a slave--we always care if it actually
started the threads that were not previously running
*/
int start_slave_threads(bool need_slave_mutex, bool wait_for_start,
Master_info* mi, const char* master_info_fname,
const char* slave_info_fname, int thread_mask)
{
mysql_mutex_t *lock_io=0, *lock_sql=0, *lock_cond_io=0, *lock_cond_sql=0;
mysql_cond_t* cond_io=0, *cond_sql=0;
int error=0;
const char *errmsg;
DBUG_ENTER("start_slave_threads");
if (need_slave_mutex)
{
lock_io = &mi->run_lock;
lock_sql = &mi->rli.run_lock;
}
if (wait_for_start)
{
cond_io = &mi->start_cond;
cond_sql = &mi->rli.start_cond;
lock_cond_io = &mi->run_lock;
lock_cond_sql = &mi->rli.run_lock;
}
/*
If we are using GTID and both SQL and IO threads are stopped, then get
rid of all relay logs.
Relay logs are not very useful when using GTID, except as a buffer
between the fetch in the IO thread and the apply in SQL thread. However
while one of the threads is running, they are in use and cannot be
removed.
*/
if (mi->using_gtid != Master_info::USE_GTID_NO &&
!mi->slave_running && !mi->rli.slave_running)
{
/*
purge_relay_logs() clears the mi->rli.group_master_log_pos.
So save and restore them, like we do in CHANGE MASTER.
(We are not going to use them for GTID, but it might be worth to
keep them in case connection with GTID fails and user wants to go
back and continue with previous old-style replication coordinates).
*/
mi->master_log_pos = MY_MAX(BIN_LOG_HEADER_SIZE,
mi->rli.group_master_log_pos);
strmake(mi->master_log_name, mi->rli.group_master_log_name,
sizeof(mi->master_log_name)-1);
purge_relay_logs(&mi->rli, NULL, 0, &errmsg);
mi->rli.group_master_log_pos= mi->master_log_pos;
strmake(mi->rli.group_master_log_name, mi->master_log_name,
sizeof(mi->rli.group_master_log_name)-1);
error= rpl_load_gtid_state(&mi->gtid_current_pos, mi->using_gtid ==
Master_info::USE_GTID_CURRENT_POS);
mi->events_queued_since_last_gtid= 0;
mi->gtid_reconnect_event_skip_count= 0;
}
if (!error && (thread_mask & SLAVE_IO))
error= start_slave_thread(
#ifdef HAVE_PSI_INTERFACE
key_thread_slave_io,
#endif
handle_slave_io, lock_io, lock_cond_io,
cond_io,
&mi->slave_running, &mi->slave_run_id,
mi);
if (!error && (thread_mask & SLAVE_SQL))
{
error= start_slave_thread(
#ifdef HAVE_PSI_INTERFACE
key_thread_slave_sql,
#endif
handle_slave_sql, lock_sql, lock_cond_sql,
cond_sql,
&mi->rli.slave_running, &mi->rli.slave_run_id,
mi);
if (error)
terminate_slave_threads(mi, thread_mask & SLAVE_IO, !need_slave_mutex);
}
DBUG_RETURN(error);
}
/*
Release slave threads at time of executing shutdown.
SYNOPSIS
end_slave()
*/
void end_slave()
{
DBUG_ENTER("end_slave");
/*
This is called when the server terminates, in close_connections().
It terminates slave threads. However, some CHANGE MASTER etc may still be
running presently. If a START SLAVE was in progress, the mutex lock below
will make us wait until slave threads have started, and START SLAVE
returns, then we terminate them here.
We can also be called by cleanup(), which only happens if some
startup parameter to the server was wrong.
*/
mysql_mutex_lock(&LOCK_active_mi);
/* This will call terminate_slave_threads() on all connections */
delete master_info_index;
master_info_index= 0;
active_mi= 0;
mysql_mutex_unlock(&LOCK_active_mi);
global_rpl_thread_pool.destroy();
free_all_rpl_filters();
DBUG_VOID_RETURN;
}
static bool io_slave_killed(Master_info* mi)
{
DBUG_ENTER("io_slave_killed");
DBUG_ASSERT(mi->slave_running); // tracking buffer overrun
DBUG_RETURN(mi->abort_slave || abort_loop || mi->io_thd->killed);
}
/**
The function analyzes a possible killed status and makes
a decision whether to accept it or not.
Normally upon accepting the sql thread goes to shutdown.
In the event of deffering decision @rli->last_event_start_time waiting
timer is set to force the killed status be accepted upon its expiration.
@param thd pointer to a THD instance
@param rli pointer to Relay_log_info instance
@return TRUE the killed status is recognized, FALSE a possible killed
status is deferred.
*/
static bool sql_slave_killed(rpl_group_info *rgi)
{
bool ret= FALSE;
Relay_log_info *rli= rgi->rli;
THD *thd= rgi->thd;
DBUG_ENTER("sql_slave_killed");
DBUG_ASSERT(rli->sql_driver_thd == thd);
DBUG_ASSERT(rli->slave_running == 1);// tracking buffer overrun
if (abort_loop || rli->sql_driver_thd->killed || rli->abort_slave)
{
/*
The transaction should always be binlogged if OPTION_KEEP_LOG is
set (it implies that something can not be rolled back). And such
case should be regarded similarly as modifing a
non-transactional table because retrying of the transaction will
lead to an error or inconsistency as well.
Example: OPTION_KEEP_LOG is set if a temporary table is created
or dropped.
Note that transaction.all.modified_non_trans_table may be 1
if last statement was a single row transaction without begin/end.
Testing this flag must always be done in connection with
rli->is_in_group().
*/
if ((thd->transaction.all.modified_non_trans_table ||
(thd->variables.option_bits & OPTION_KEEP_LOG)) &&
rli->is_in_group())
{
char msg_stopped[]=
"... Slave SQL Thread stopped with incomplete event group "
"having non-transactional changes. "
"If the group consists solely of row-based events, you can try "
"to restart the slave with --slave-exec-mode=IDEMPOTENT, which "
"ignores duplicate key, key not found, and similar errors (see "
"documentation for details).";
DBUG_PRINT("info", ("modified_non_trans_table: %d OPTION_BEGIN: %d "
"OPTION_KEEP_LOG: %d is_in_group: %d",
thd->transaction.all.modified_non_trans_table,
MY_TEST(thd->variables.option_bits & OPTION_BEGIN),
MY_TEST(thd->variables.option_bits & OPTION_KEEP_LOG),
rli->is_in_group()));
if (rli->abort_slave)
{
DBUG_PRINT("info",
("Request to stop slave SQL Thread received while "
"applying a group that has non-transactional "
"changes; waiting for completion of the group ... "));
/*
Slave sql thread shutdown in face of unfinished group
modified Non-trans table is handled via a timer. The slave
may eventually give out to complete the current group and in
that case there might be issues at consequent slave restart,
see the error message. WL#2975 offers a robust solution
requiring to store the last exectuted event's coordinates
along with the group's coordianates instead of waiting with
@c last_event_start_time the timer.
*/
if (rgi->last_event_start_time == 0)
rgi->last_event_start_time= my_time(0);
ret= difftime(my_time(0), rgi->last_event_start_time) <=
SLAVE_WAIT_GROUP_DONE ? FALSE : TRUE;
DBUG_EXECUTE_IF("stop_slave_middle_group",
DBUG_EXECUTE_IF("incomplete_group_in_relay_log",
ret= TRUE;);); // time is over
if (ret == 0)
{
rli->report(WARNING_LEVEL, 0, rgi->gtid_info(),
"Request to stop slave SQL Thread received while "
"applying a group that has non-transactional "
"changes; waiting for completion of the group ... ");
}
else
{
rli->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR, rgi->gtid_info(),
ER(ER_SLAVE_FATAL_ERROR), msg_stopped);
}
}
else
{
ret= TRUE;
rli->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR, rgi->gtid_info(),
ER(ER_SLAVE_FATAL_ERROR),
msg_stopped);
}
}
else
{
ret= TRUE;
}
}
if (ret)
rgi->last_event_start_time= 0;
DBUG_RETURN(ret);
}
/*
skip_load_data_infile()
NOTES
This is used to tell a 3.23 master to break send_file()
*/
void skip_load_data_infile(NET *net)
{
DBUG_ENTER("skip_load_data_infile");
(void)net_request_file(net, "/dev/null");
(void)my_net_read(net); // discard response
(void)net_write_command(net, 0, (uchar*) "", 0, (uchar*) "", 0); // ok
DBUG_VOID_RETURN;
}
bool net_request_file(NET* net, const char* fname)
{
DBUG_ENTER("net_request_file");
DBUG_RETURN(net_write_command(net, 251, (uchar*) fname, strlen(fname),
(uchar*) "", 0));
}
/*
From other comments and tests in code, it looks like
sometimes Query_log_event and Load_log_event can have db == 0
(see rewrite_db() above for example)
(cases where this happens are unclear; it may be when the master is 3.23).
*/
const char *print_slave_db_safe(const char* db)
{
DBUG_ENTER("*print_slave_db_safe");
DBUG_RETURN((db ? db : ""));
}
#endif /* HAVE_REPLICATION */
int init_strvar_from_file(char *var, int max_size, IO_CACHE *f,
const char *default_val)
{
uint length;
DBUG_ENTER("init_strvar_from_file");
if ((length=my_b_gets(f,var, max_size)))
{
char* last_p = var + length -1;
if (*last_p == '\n')
*last_p = 0; // if we stopped on newline, kill it
else
{
/*
If we truncated a line or stopped on last char, remove all chars
up to and including newline.
*/
int c;
while (((c=my_b_get(f)) != '\n' && c != my_b_EOF)) ;
}
DBUG_RETURN(0);
}
else if (default_val)
{
strmake(var, default_val, max_size-1);
DBUG_RETURN(0);
}
DBUG_RETURN(1);
}
/*
when moving these functions to mysys, don't forget to
remove slave.cc from libmysqld/CMakeLists.txt
*/
int init_intvar_from_file(int* var, IO_CACHE* f, int default_val)
{
char buf[32];
DBUG_ENTER("init_intvar_from_file");
if (my_b_gets(f, buf, sizeof(buf)))
{
*var = atoi(buf);
DBUG_RETURN(0);
}
else if (default_val)
{
*var = default_val;
DBUG_RETURN(0);
}
DBUG_RETURN(1);
}
int init_floatvar_from_file(float* var, IO_CACHE* f, float default_val)
{
char buf[16];
DBUG_ENTER("init_floatvar_from_file");
if (my_b_gets(f, buf, sizeof(buf)))
{
if (sscanf(buf, "%f", var) != 1)
DBUG_RETURN(1);
else
DBUG_RETURN(0);
}
else if (default_val != 0.0)
{
*var = default_val;
DBUG_RETURN(0);
}
DBUG_RETURN(1);
}
/**
A master info read method
This function is called from @c init_master_info() along with
relatives to restore some of @c active_mi members.
Particularly, this function is responsible for restoring
IGNORE_SERVER_IDS list of servers whose events the slave is
going to ignore (to not log them in the relay log).
Items being read are supposed to be decimal output of values of a
type shorter or equal of @c long and separated by the single space.
@param arr @c DYNAMIC_ARRAY pointer to storage for servers id
@param f @c IO_CACHE pointer to the source file
@retval 0 All OK
@retval non-zero An error
*/
int init_dynarray_intvar_from_file(DYNAMIC_ARRAY* arr, IO_CACHE* f)
{
int ret= 0;
char buf[16 * (sizeof(long)*4 + 1)]; // static buffer to use most of times
char *buf_act= buf; // actual buffer can be dynamic if static is short
char *token, *last;
uint num_items; // number of items of `arr'
size_t read_size;
DBUG_ENTER("init_dynarray_intvar_from_file");
if ((read_size= my_b_gets(f, buf_act, sizeof(buf))) == 0)
{
return 0; // no line in master.info
}
if (read_size + 1 == sizeof(buf) && buf[sizeof(buf) - 2] != '\n')
{
/*
short read happend; allocate sufficient memory and make the 2nd read
*/
char buf_work[(sizeof(long)*3 + 1)*16];
memcpy(buf_work, buf, sizeof(buf_work));
num_items= atoi(strtok_r(buf_work, " ", &last));
size_t snd_size;
/*
max size lower bound approximate estimation bases on the formula:
(the items number + items themselves) *
(decimal size + space) - 1 + `\n' + '\0'
*/
size_t max_size= (1 + num_items) * (sizeof(long)*3 + 1) + 1;
buf_act= (char*) my_malloc(max_size, MYF(MY_WME));
memcpy(buf_act, buf, read_size);
snd_size= my_b_gets(f, buf_act + read_size, max_size - read_size);
if (snd_size == 0 ||
((snd_size + 1 == max_size - read_size) && buf_act[max_size - 2] != '\n'))
{
/*
failure to make the 2nd read or short read again
*/
ret= 1;
goto err;
}
}
token= strtok_r(buf_act, " ", &last);
if (token == NULL)
{
ret= 1;
goto err;
}
num_items= atoi(token);
for (uint i=0; i < num_items; i++)
{
token= strtok_r(NULL, " ", &last);
if (token == NULL)
{
ret= 1;
goto err;
}
else
{
ulong val= atol(token);
insert_dynamic(arr, (uchar *) &val);
}
}
err:
if (buf_act != buf)
my_free(buf_act);
DBUG_RETURN(ret);
}
#ifdef HAVE_REPLICATION
/*
Check if the error is caused by network.
@param[in] errorno Number of the error.
RETURNS:
TRUE network error
FALSE not network error
*/
bool is_network_error(uint errorno)
{
if (errorno == CR_CONNECTION_ERROR ||
errorno == CR_CONN_HOST_ERROR ||
errorno == CR_SERVER_GONE_ERROR ||
errorno == CR_SERVER_LOST ||
errorno == ER_CON_COUNT_ERROR ||
errorno == ER_CONNECTION_KILLED ||
errorno == ER_NEW_ABORTING_CONNECTION ||
errorno == ER_NET_READ_INTERRUPTED ||
errorno == ER_SERVER_SHUTDOWN)
return TRUE;
return FALSE;
}
/*
Note that we rely on the master's version (3.23, 4.0.14 etc) instead of
relying on the binlog's version. This is not perfect: imagine an upgrade
of the master without waiting that all slaves are in sync with the master;
then a slave could be fooled about the binlog's format. This is what happens
when people upgrade a 3.23 master to 4.0 without doing RESET MASTER: 4.0
slaves are fooled. So we do this only to distinguish between 3.23 and more
recent masters (it's too late to change things for 3.23).
RETURNS
0 ok
1 error
2 transient network problem, the caller should try to reconnect
*/
static int get_master_version_and_clock(MYSQL* mysql, Master_info* mi)
{
char err_buff[MAX_SLAVE_ERRMSG], err_buff2[MAX_SLAVE_ERRMSG];
const char* errmsg= 0;
int err_code= 0;
MYSQL_RES *master_res= 0;
MYSQL_ROW master_row;
uint version= mysql_get_server_version(mysql) / 10000;
DBUG_ENTER("get_master_version_and_clock");
/*
Free old description_event_for_queue (that is needed if we are in
a reconnection).
*/
delete mi->rli.relay_log.description_event_for_queue;
mi->rli.relay_log.description_event_for_queue= 0;
if (!my_isdigit(&my_charset_bin,*mysql->server_version))
{
errmsg= err_buff2;
snprintf(err_buff2, sizeof(err_buff2),
"Master reported unrecognized MySQL version: %s",
mysql->server_version);
err_code= ER_SLAVE_FATAL_ERROR;
sprintf(err_buff, ER(err_code), err_buff2);
}
else
{
/*
Note the following switch will bug when we have MySQL branch 30 ;)
*/
switch (version) {
case 0:
case 1:
case 2:
errmsg= err_buff2;
snprintf(err_buff2, sizeof(err_buff2),
"Master reported unrecognized MySQL version: %s",
mysql->server_version);
err_code= ER_SLAVE_FATAL_ERROR;
sprintf(err_buff, ER(err_code), err_buff2);
break;
case 3:
mi->rli.relay_log.description_event_for_queue= new
Format_description_log_event(1, mysql->server_version);
break;
case 4:
mi->rli.relay_log.description_event_for_queue= new
Format_description_log_event(3, mysql->server_version);
break;
default:
/*
Master is MySQL >=5.0. Give a default Format_desc event, so that we can
take the early steps (like tests for "is this a 3.23 master") which we
have to take before we receive the real master's Format_desc which will
override this one. Note that the Format_desc we create below is garbage
(it has the format of the *slave*); it's only good to help know if the
master is 3.23, 4.0, etc.
*/
mi->rli.relay_log.description_event_for_queue= new
Format_description_log_event(4, mysql->server_version);
break;
}
}
/*
This does not mean that a 5.0 slave will be able to read a 6.0 master; but
as we don't know yet, we don't want to forbid this for now. If a 5.0 slave
can't read a 6.0 master, this will show up when the slave can't read some
events sent by the master, and there will be error messages.
*/
if (errmsg)
goto err;
/* as we are here, we tried to allocate the event */
if (!mi->rli.relay_log.description_event_for_queue)
{
errmsg= "default Format_description_log_event";
err_code= ER_SLAVE_CREATE_EVENT_FAILURE;
sprintf(err_buff, ER(err_code), errmsg);
goto err;
}
/*
FD_q's (A) is set initially from RL's (A): FD_q.(A) := RL.(A).
It's necessary to adjust FD_q.(A) at this point because in the following
course FD_q is going to be dumped to RL.
Generally FD_q is derived from a received FD_m (roughly FD_q := FD_m)
in queue_event and the master's (A) is installed.
At one step with the assignment the Relay-Log's checksum alg is set to
a new value: RL.(A) := FD_q.(A). If the slave service is stopped
the last time assigned RL.(A) will be passed over to the restarting
service (to the current execution point).
RL.A is a "codec" to verify checksum in queue_event() almost all the time
the first fake Rotate event.
Starting from this point IO thread will executes the following checksum
warmup sequence of actions:
FD_q.A := RL.A,
A_m^0 := master.@@global.binlog_checksum,
{queue_event(R_f): verifies(R_f, A_m^0)},
{queue_event(FD_m): verifies(FD_m, FD_m.A), dump(FD_q), rotate(RL),
FD_q := FD_m, RL.A := FD_q.A)}
See legends definition on MYSQL_BIN_LOG::relay_log_checksum_alg
docs lines (binlog.h).
In above A_m^0 - the value of master's
@@binlog_checksum determined in the upcoming handshake (stored in
mi->checksum_alg_before_fd).
After the warm-up sequence IO gets to "normal" checksum verification mode
to use RL.A in
{queue_event(E_m): verifies(E_m, RL.A)}
until it has received a new FD_m.
*/
mi->rli.relay_log.description_event_for_queue->checksum_alg=
mi->rli.relay_log.relay_log_checksum_alg;
DBUG_ASSERT(mi->rli.relay_log.description_event_for_queue->checksum_alg !=
BINLOG_CHECKSUM_ALG_UNDEF);
DBUG_ASSERT(mi->rli.relay_log.relay_log_checksum_alg !=
BINLOG_CHECKSUM_ALG_UNDEF);
/*
Compare the master and slave's clock. Do not die if master's clock is
unavailable (very old master not supporting UNIX_TIMESTAMP()?).
*/
#ifdef ENABLED_DEBUG_SYNC
DBUG_EXECUTE_IF("dbug.before_get_UNIX_TIMESTAMP",
{
const char act[]=
"now "
"wait_for signal.get_unix_timestamp";
DBUG_ASSERT(debug_sync_service);
DBUG_ASSERT(!debug_sync_set_action(current_thd,
STRING_WITH_LEN(act)));
};);
#endif
master_res= NULL;
if (!mysql_real_query(mysql, STRING_WITH_LEN("SELECT UNIX_TIMESTAMP()")) &&
(master_res= mysql_store_result(mysql)) &&
(master_row= mysql_fetch_row(master_res)))
{
mi->clock_diff_with_master=
(long) (time((time_t*) 0) - strtoul(master_row[0], 0, 10));
}
else if (check_io_slave_killed(mi, NULL))
goto slave_killed_err;
else if (is_network_error(mysql_errno(mysql)))
{
mi->report(WARNING_LEVEL, mysql_errno(mysql), NULL,
"Get master clock failed with error: %s", mysql_error(mysql));
goto network_err;
}
else
{
mi->clock_diff_with_master= 0; /* The "most sensible" value */
sql_print_warning("\"SELECT UNIX_TIMESTAMP()\" failed on master, "
"do not trust column Seconds_Behind_Master of SHOW "
"SLAVE STATUS. Error: %s (%d)",
mysql_error(mysql), mysql_errno(mysql));
}
if (master_res)
{
mysql_free_result(master_res);
master_res= NULL;
}
/*
Check that the master's server id and ours are different. Because if they
are equal (which can result from a simple copy of master's datadir to slave,
thus copying some my.cnf), replication will work but all events will be
skipped.
Do not die if SHOW VARIABLES LIKE 'SERVER_ID' fails on master (very old
master?).
Note: we could have put a @@SERVER_ID in the previous SELECT
UNIX_TIMESTAMP() instead, but this would not have worked on 3.23 masters.
*/
#ifdef ENABLED_DEBUG_SYNC
DBUG_EXECUTE_IF("dbug.before_get_SERVER_ID",
{
const char act[]=
"now "
"wait_for signal.get_server_id";
DBUG_ASSERT(debug_sync_service);
DBUG_ASSERT(!debug_sync_set_action(current_thd,
STRING_WITH_LEN(act)));
};);
#endif
master_res= NULL;
master_row= NULL;
if (!mysql_real_query(mysql,
STRING_WITH_LEN("SHOW VARIABLES LIKE 'SERVER_ID'")) &&
(master_res= mysql_store_result(mysql)) &&
(master_row= mysql_fetch_row(master_res)))
{
if ((global_system_variables.server_id ==
(mi->master_id= strtoul(master_row[1], 0, 10))) &&
!mi->rli.replicate_same_server_id)
{
errmsg= "The slave I/O thread stops because master and slave have equal \
MySQL server ids; these ids must be different for replication to work (or \
the --replicate-same-server-id option must be used on slave but this does \
not always make sense; please check the manual before using it).";
err_code= ER_SLAVE_FATAL_ERROR;
sprintf(err_buff, ER(err_code), errmsg);
goto err;
}
}
else if (mysql_errno(mysql))
{
if (check_io_slave_killed(mi, NULL))
goto slave_killed_err;
else if (is_network_error(mysql_errno(mysql)))
{
mi->report(WARNING_LEVEL, mysql_errno(mysql), NULL,
"Get master SERVER_ID failed with error: %s", mysql_error(mysql));
goto network_err;
}
/* Fatal error */
errmsg= "The slave I/O thread stops because a fatal error is encountered \
when it try to get the value of SERVER_ID variable from master.";
err_code= mysql_errno(mysql);
sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
goto err;
}
else if (!master_row && master_res)
{
mi->report(WARNING_LEVEL, ER_UNKNOWN_SYSTEM_VARIABLE, NULL,
"Unknown system variable 'SERVER_ID' on master, \
maybe it is a *VERY OLD MASTER*.");
}
if (master_res)
{
mysql_free_result(master_res);
master_res= NULL;
}
if (mi->master_id == 0 && mi->ignore_server_ids.elements > 0)
{
errmsg= "Slave configured with server id filtering could not detect the master server id.";
err_code= ER_SLAVE_FATAL_ERROR;
sprintf(err_buff, ER(err_code), errmsg);
goto err;
}
/*
Check that the master's global character_set_server and ours are the same.
Not fatal if query fails (old master?).
Note that we don't check for equality of global character_set_client and
collation_connection (neither do we prevent their setting in
set_var.cc). That's because from what I (Guilhem) have tested, the global
values of these 2 are never used (new connections don't use them).
We don't test equality of global collation_database either as it's is
going to be deprecated (made read-only) in 4.1 very soon.
The test is only relevant if master < 5.0.3 (we'll test only if it's older
than the 5 branch; < 5.0.3 was alpha...), as >= 5.0.3 master stores
charset info in each binlog event.
We don't do it for 3.23 because masters <3.23.50 hang on
SELECT @@unknown_var (BUG#7965 - see changelog of 3.23.50). So finally we
test only if master is 4.x.
*/
/* redundant with rest of code but safer against later additions */
if (version == 3)
goto err;
if (version == 4)
{
master_res= NULL;
if (!mysql_real_query(mysql,
STRING_WITH_LEN("SELECT @@GLOBAL.COLLATION_SERVER")) &&
(master_res= mysql_store_result(mysql)) &&
(master_row= mysql_fetch_row(master_res)))
{
if (strcmp(master_row[0], global_system_variables.collation_server->name))
{
errmsg= "The slave I/O thread stops because master and slave have \
different values for the COLLATION_SERVER global variable. The values must \
be equal for the Statement-format replication to work";
err_code= ER_SLAVE_FATAL_ERROR;
sprintf(err_buff, ER(err_code), errmsg);
goto err;
}
}
else if (check_io_slave_killed(mi, NULL))
goto slave_killed_err;
else if (is_network_error(mysql_errno(mysql)))
{
mi->report(WARNING_LEVEL, mysql_errno(mysql), NULL,
"Get master COLLATION_SERVER failed with error: %s", mysql_error(mysql));
goto network_err;
}
else if (mysql_errno(mysql) != ER_UNKNOWN_SYSTEM_VARIABLE)
{
/* Fatal error */
errmsg= "The slave I/O thread stops because a fatal error is encountered \
when it try to get the value of COLLATION_SERVER global variable from master.";
err_code= mysql_errno(mysql);
sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
goto err;
}
else
mi->report(WARNING_LEVEL, ER_UNKNOWN_SYSTEM_VARIABLE, NULL,
"Unknown system variable 'COLLATION_SERVER' on master, \
maybe it is a *VERY OLD MASTER*. *NOTE*: slave may experience \
inconsistency if replicated data deals with collation.");
if (master_res)
{
mysql_free_result(master_res);
master_res= NULL;
}
}
/*
Perform analogous check for time zone. Theoretically we also should
perform check here to verify that SYSTEM time zones are the same on
slave and master, but we can't rely on value of @@system_time_zone
variable (it is time zone abbreviation) since it determined at start
time and so could differ for slave and master even if they are really
in the same system time zone. So we are omiting this check and just
relying on documentation. Also according to Monty there are many users
who are using replication between servers in various time zones. Hence
such check will broke everything for them. (And now everything will
work for them because by default both their master and slave will have
'SYSTEM' time zone).
This check is only necessary for 4.x masters (and < 5.0.4 masters but
those were alpha).
*/
if (version == 4)
{
master_res= NULL;
if (!mysql_real_query(mysql, STRING_WITH_LEN("SELECT @@GLOBAL.TIME_ZONE")) &&
(master_res= mysql_store_result(mysql)) &&
(master_row= mysql_fetch_row(master_res)))
{
if (strcmp(master_row[0],
global_system_variables.time_zone->get_name()->ptr()))
{
errmsg= "The slave I/O thread stops because master and slave have \
different values for the TIME_ZONE global variable. The values must \
be equal for the Statement-format replication to work";
err_code= ER_SLAVE_FATAL_ERROR;
sprintf(err_buff, ER(err_code), errmsg);
goto err;
}
}
else if (check_io_slave_killed(mi, NULL))
goto slave_killed_err;
else if (is_network_error(err_code= mysql_errno(mysql)))
{
mi->report(ERROR_LEVEL, err_code, NULL,
"Get master TIME_ZONE failed with error: %s",
mysql_error(mysql));
goto network_err;
}
else if (err_code == ER_UNKNOWN_SYSTEM_VARIABLE)
{
/* We use ERROR_LEVEL to get the error logged to file */
mi->report(ERROR_LEVEL, err_code, NULL,
"MySQL master doesn't have a TIME_ZONE variable. Note that"
"if your timezone is not same between master and slave, your "
"slave may get wrong data into timestamp columns");
}
else
{
/* Fatal error */
errmsg= "The slave I/O thread stops because a fatal error is encountered \
when it try to get the value of TIME_ZONE global variable from master.";
sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
goto err;
}
if (master_res)
{
mysql_free_result(master_res);
master_res= NULL;
}
}
if (mi->heartbeat_period != 0.0)
{
char llbuf[22];
const char query_format[]= "SET @master_heartbeat_period= %s";
char query[sizeof(query_format) - 2 + sizeof(llbuf)];
/*
the period is an ulonglong of nano-secs.
*/
llstr((ulonglong) (mi->heartbeat_period*1000000000UL), llbuf);
sprintf(query, query_format, llbuf);
DBUG_EXECUTE_IF("simulate_slave_heartbeat_network_error",
{ static ulong dbug_count= 0;
if (++dbug_count < 3)
goto heartbeat_network_error;
});
if (mysql_real_query(mysql, query, strlen(query)))
{
if (check_io_slave_killed(mi, NULL))
goto slave_killed_err;
if (is_network_error(mysql_errno(mysql)))
{
IF_DBUG(heartbeat_network_error: , )
mi->report(WARNING_LEVEL, mysql_errno(mysql), NULL,
"SET @master_heartbeat_period to master failed with error: %s",
mysql_error(mysql));
mysql_free_result(mysql_store_result(mysql));
goto network_err;
}
else
{
/* Fatal error */
errmsg= "The slave I/O thread stops because a fatal error is encountered "
"when it tries to SET @master_heartbeat_period on master.";
err_code= ER_SLAVE_FATAL_ERROR;
sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
mysql_free_result(mysql_store_result(mysql));
goto err;
}
}
mysql_free_result(mysql_store_result(mysql));
}
/*
Querying if master is capable to checksum and notifying it about own
CRC-awareness. The master's side instant value of @@global.binlog_checksum
is stored in the dump thread's uservar area as well as cached locally
to become known in consensus by master and slave.
*/
DBUG_EXECUTE_IF("simulate_slave_unaware_checksum",
mi->checksum_alg_before_fd= BINLOG_CHECKSUM_ALG_OFF;
goto past_checksum;);
{
int rc;
const char query[]= "SET @master_binlog_checksum= @@global.binlog_checksum";
master_res= NULL;
mi->checksum_alg_before_fd= BINLOG_CHECKSUM_ALG_UNDEF; //initially undefined
/*
@c checksum_alg_before_fd is queried from master in this block.
If master is old checksum-unaware the value stays undefined.
Once the first FD will be received its alg descriptor will replace
the being queried one.
*/
rc= mysql_real_query(mysql, query, strlen(query));
if (rc != 0)
{
if (check_io_slave_killed(mi, NULL))
goto slave_killed_err;
if (mysql_errno(mysql) == ER_UNKNOWN_SYSTEM_VARIABLE)
{
/* Ignore this expected error if not a high error level */
if (global_system_variables.log_warnings > 1)
{
// this is tolerable as OM -> NS is supported
mi->report(WARNING_LEVEL, mysql_errno(mysql), NULL,
"Notifying master by %s failed with "
"error: %s", query, mysql_error(mysql));
}
}
else
{
if (is_network_error(mysql_errno(mysql)))
{
mi->report(WARNING_LEVEL, mysql_errno(mysql), NULL,
"Notifying master by %s failed with "
"error: %s", query, mysql_error(mysql));
mysql_free_result(mysql_store_result(mysql));
goto network_err;
}
else
{
errmsg= "The slave I/O thread stops because a fatal error is encountered "
"when it tried to SET @master_binlog_checksum on master.";
err_code= ER_SLAVE_FATAL_ERROR;
sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
mysql_free_result(mysql_store_result(mysql));
goto err;
}
}
}
else
{
mysql_free_result(mysql_store_result(mysql));
if (!mysql_real_query(mysql,
STRING_WITH_LEN("SELECT @master_binlog_checksum")) &&
(master_res= mysql_store_result(mysql)) &&
(master_row= mysql_fetch_row(master_res)) &&
(master_row[0] != NULL))
{
mi->checksum_alg_before_fd= (uint8)
find_type(master_row[0], &binlog_checksum_typelib, 1) - 1;
// valid outcome is either of
DBUG_ASSERT(mi->checksum_alg_before_fd == BINLOG_CHECKSUM_ALG_OFF ||
mi->checksum_alg_before_fd == BINLOG_CHECKSUM_ALG_CRC32);
}
else if (check_io_slave_killed(mi, NULL))
goto slave_killed_err;
else if (is_network_error(mysql_errno(mysql)))
{
mi->report(WARNING_LEVEL, mysql_errno(mysql), NULL,
"Get master BINLOG_CHECKSUM failed with error: %s", mysql_error(mysql));
goto network_err;
}
else
{
errmsg= "The slave I/O thread stops because a fatal error is encountered "
"when it tried to SELECT @master_binlog_checksum.";
err_code= ER_SLAVE_FATAL_ERROR;
sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
mysql_free_result(mysql_store_result(mysql));
goto err;
}
}
if (master_res)
{
mysql_free_result(master_res);
master_res= NULL;
}
}
#ifndef DBUG_OFF
past_checksum:
#endif
/*
Request the master to filter away events with the @@skip_replication flag
set, if we are running with
--replicate-events-marked-for-skip=FILTER_ON_MASTER.
*/
if (opt_replicate_events_marked_for_skip == RPL_SKIP_FILTER_ON_MASTER)
{
if (mysql_real_query(mysql, STRING_WITH_LEN("SET skip_replication=1")))
{
err_code= mysql_errno(mysql);
if (is_network_error(err_code))
{
mi->report(ERROR_LEVEL, err_code, NULL,
"Setting master-side filtering of @@skip_replication failed "
"with error: %s", mysql_error(mysql));
goto network_err;
}
else if (err_code == ER_UNKNOWN_SYSTEM_VARIABLE)
{
/*
The master is older than the slave and does not support the
@@skip_replication feature.
This is not a problem, as such master will not generate events with
the @@skip_replication flag set in the first place. We will still
do slave-side filtering of such events though, to handle the (rare)
case of downgrading a master and receiving old events generated from
before the downgrade with the @@skip_replication flag set.
*/
DBUG_PRINT("info", ("Old master does not support master-side filtering "
"of @@skip_replication events."));
}
else
{
/* Fatal error */
errmsg= "The slave I/O thread stops because a fatal error is "
"encountered when it tries to request filtering of events marked "
"with the @@skip_replication flag.";
sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
goto err;
}
}
}
/* Announce MariaDB slave capabilities. */
DBUG_EXECUTE_IF("simulate_slave_capability_none", goto after_set_capability;);
{
int rc= DBUG_EVALUATE_IF("simulate_slave_capability_old_53",
mysql_real_query(mysql, STRING_WITH_LEN("SET @mariadb_slave_capability="
STRINGIFY_ARG(MARIA_SLAVE_CAPABILITY_ANNOTATE))),
mysql_real_query(mysql, STRING_WITH_LEN("SET @mariadb_slave_capability="
STRINGIFY_ARG(MARIA_SLAVE_CAPABILITY_MINE))));
if (rc)
{
err_code= mysql_errno(mysql);
if (is_network_error(err_code))
{
mi->report(ERROR_LEVEL, err_code, NULL,
"Setting @mariadb_slave_capability failed with error: %s",
mysql_error(mysql));
goto network_err;
}
else
{
/* Fatal error */
errmsg= "The slave I/O thread stops because a fatal error is "
"encountered when it tries to set @mariadb_slave_capability.";
sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
goto err;
}
}
}
#ifndef DBUG_OFF
after_set_capability:
#endif
if (mi->using_gtid != Master_info::USE_GTID_NO)
{
/* Request dump to start from slave replication GTID state. */
int rc;
char str_buf[256];
String query_str(str_buf, sizeof(str_buf), system_charset_info);
query_str.length(0);
/*
Read the master @@GLOBAL.gtid_domain_id variable.
This is mostly to check that master is GTID aware, but we could later
perhaps use it to check that different multi-source masters are correctly
configured with distinct domain_id.
*/
if (mysql_real_query(mysql,
STRING_WITH_LEN("SELECT @@GLOBAL.gtid_domain_id")) ||
!(master_res= mysql_store_result(mysql)) ||
!(master_row= mysql_fetch_row(master_res)))
{
err_code= mysql_errno(mysql);
errmsg= "The slave I/O thread stops because master does not support "
"MariaDB global transaction id. A fatal error is encountered when "
"it tries to SELECT @@GLOBAL.gtid_domain_id.";
sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
goto err;
}
mysql_free_result(master_res);
master_res= NULL;
query_str.append(STRING_WITH_LEN("SET @slave_connect_state='"),
system_charset_info);
if (mi->gtid_current_pos.append_to_string(&query_str))
{
err_code= ER_OUTOFMEMORY;
errmsg= "The slave I/O thread stops because a fatal out-of-memory "
"error is encountered when it tries to compute @slave_connect_state.";
sprintf(err_buff, "%s Error: Out of memory", errmsg);
goto err;
}
query_str.append(STRING_WITH_LEN("'"), system_charset_info);
rc= mysql_real_query(mysql, query_str.ptr(), query_str.length());
if (rc)
{
err_code= mysql_errno(mysql);
if (is_network_error(err_code))
{
mi->report(ERROR_LEVEL, err_code, NULL,
"Setting @slave_connect_state failed with error: %s",
mysql_error(mysql));
goto network_err;
}
else
{
/* Fatal error */
errmsg= "The slave I/O thread stops because a fatal error is "
"encountered when it tries to set @slave_connect_state.";
sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
goto err;
}
}
query_str.length(0);
if (query_str.append(STRING_WITH_LEN("SET @slave_gtid_strict_mode="),
system_charset_info) ||
query_str.append_ulonglong(opt_gtid_strict_mode != false))
{
err_code= ER_OUTOFMEMORY;
errmsg= "The slave I/O thread stops because a fatal out-of-memory "
"error is encountered when it tries to set @slave_gtid_strict_mode.";
sprintf(err_buff, "%s Error: Out of memory", errmsg);
goto err;
}
rc= mysql_real_query(mysql, query_str.ptr(), query_str.length());
if (rc)
{
err_code= mysql_errno(mysql);
if (is_network_error(err_code))
{
mi->report(ERROR_LEVEL, err_code, NULL,
"Setting @slave_gtid_strict_mode failed with error: %s",
mysql_error(mysql));
goto network_err;
}
else
{
/* Fatal error */
errmsg= "The slave I/O thread stops because a fatal error is "
"encountered when it tries to set @slave_gtid_strict_mode.";
sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
goto err;
}
}
query_str.length(0);
if (query_str.append(STRING_WITH_LEN("SET @slave_gtid_ignore_duplicates="),
system_charset_info) ||
query_str.append_ulonglong(opt_gtid_ignore_duplicates != false))
{
err_code= ER_OUTOFMEMORY;
errmsg= "The slave I/O thread stops because a fatal out-of-memory error "
"is encountered when it tries to set @slave_gtid_ignore_duplicates.";
sprintf(err_buff, "%s Error: Out of memory", errmsg);
goto err;
}
rc= mysql_real_query(mysql, query_str.ptr(), query_str.length());
if (rc)
{
err_code= mysql_errno(mysql);
if (is_network_error(err_code))
{
mi->report(ERROR_LEVEL, err_code, NULL,
"Setting @slave_gtid_ignore_duplicates failed with "
"error: %s", mysql_error(mysql));
goto network_err;
}
else
{
/* Fatal error */
errmsg= "The slave I/O thread stops because a fatal error is "
"encountered when it tries to set @slave_gtid_ignore_duplicates.";
sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
goto err;
}
}
if (mi->rli.until_condition == Relay_log_info::UNTIL_GTID)
{
query_str.length(0);
query_str.append(STRING_WITH_LEN("SET @slave_until_gtid='"),
system_charset_info);
if (mi->rli.until_gtid_pos.append_to_string(&query_str))
{
err_code= ER_OUTOFMEMORY;
errmsg= "The slave I/O thread stops because a fatal out-of-memory "
"error is encountered when it tries to compute @slave_until_gtid.";
sprintf(err_buff, "%s Error: Out of memory", errmsg);
goto err;
}
query_str.append(STRING_WITH_LEN("'"), system_charset_info);
rc= mysql_real_query(mysql, query_str.ptr(), query_str.length());
if (rc)
{
err_code= mysql_errno(mysql);
if (is_network_error(err_code))
{
mi->report(ERROR_LEVEL, err_code, NULL,
"Setting @slave_until_gtid failed with error: %s",
mysql_error(mysql));
goto network_err;
}
else
{
/* Fatal error */
errmsg= "The slave I/O thread stops because a fatal error is "
"encountered when it tries to set @slave_until_gtid.";
sprintf(err_buff, "%s Error: %s", errmsg, mysql_error(mysql));
goto err;
}
}
}
}
else
{
/*
If we are not using GTID to connect this time, then instead request
the corresponding GTID position from the master, so that the user
can reconnect the next time using MASTER_GTID_POS=AUTO.
*/
char quote_buf[2*sizeof(mi->master_log_name)+1];
char str_buf[28+2*sizeof(mi->master_log_name)+10];
String query(str_buf, sizeof(str_buf), system_charset_info);
query.length(0);
query.append("SELECT binlog_gtid_pos('");
escape_quotes_for_mysql(&my_charset_bin, quote_buf, sizeof(quote_buf),
mi->master_log_name, strlen(mi->master_log_name));
query.append(quote_buf);
query.append("',");
query.append_ulonglong(mi->master_log_pos);
query.append(")");
if (!mysql_real_query(mysql, query.c_ptr_safe(), query.length()) &&
(master_res= mysql_store_result(mysql)) &&
(master_row= mysql_fetch_row(master_res)) &&
(master_row[0] != NULL))
{
rpl_global_gtid_slave_state.load(mi->io_thd, master_row[0],
strlen(master_row[0]), false, false);
}
else if (check_io_slave_killed(mi, NULL))
goto slave_killed_err;
else if (is_network_error(mysql_errno(mysql)))
{
mi->report(WARNING_LEVEL, mysql_errno(mysql), NULL,
"Get master GTID position failed with error: %s", mysql_error(mysql));
goto network_err;
}
else
{
/*
ToDo: If the master does not have the binlog_gtid_pos() function, it
just means that it is an old master with no GTID support, so we should
do nothing.
However, if binlog_gtid_pos() exists, but fails or returns NULL, then
it means that the requested position is not valid. We could use this
to catch attempts to replicate from within the middle of an event,
avoiding strange failures or possible corruption.
*/
}
if (master_res)
{
mysql_free_result(master_res);
master_res= NULL;
}
}
err:
if (errmsg)
{
if (master_res)
mysql_free_result(master_res);
DBUG_ASSERT(err_code != 0);
mi->report(ERROR_LEVEL, err_code, NULL, "%s", err_buff);
DBUG_RETURN(1);
}
DBUG_RETURN(0);
network_err:
if (master_res)
mysql_free_result(master_res);
DBUG_RETURN(2);
slave_killed_err:
if (master_res)
mysql_free_result(master_res);
DBUG_RETURN(2);
}
static bool wait_for_relay_log_space(Relay_log_info* rli)
{
bool slave_killed=0;
bool ignore_log_space_limit;
Master_info* mi = rli->mi;
PSI_stage_info old_stage;
THD* thd = mi->io_thd;
DBUG_ENTER("wait_for_relay_log_space");
mysql_mutex_lock(&rli->log_space_lock);
thd->ENTER_COND(&rli->log_space_cond,
&rli->log_space_lock,
&stage_waiting_for_relay_log_space,
&old_stage);
while (rli->log_space_limit < rli->log_space_total &&
!(slave_killed=io_slave_killed(mi)) &&
!rli->ignore_log_space_limit)
mysql_cond_wait(&rli->log_space_cond, &rli->log_space_lock);
ignore_log_space_limit= rli->ignore_log_space_limit;
rli->ignore_log_space_limit= 0;
thd->EXIT_COND(&old_stage);
/*
Makes the IO thread read only one event at a time
until the SQL thread is able to purge the relay
logs, freeing some space.
Therefore, once the SQL thread processes this next
event, it goes to sleep (no more events in the queue),
sets ignore_log_space_limit=true and wakes the IO thread.
However, this event may have been enough already for
the SQL thread to purge some log files, freeing
rli->log_space_total .
This guarantees that the SQL and IO thread move
forward only one event at a time (to avoid deadlocks),
when the relay space limit is reached. It also
guarantees that when the SQL thread is prepared to
rotate (to be able to purge some logs), the IO thread
will know about it and will rotate.
NOTE: The ignore_log_space_limit is only set when the SQL
thread sleeps waiting for events.
*/
if (ignore_log_space_limit)
{
#ifndef DBUG_OFF
{
char llbuf1[22], llbuf2[22];
DBUG_PRINT("info", ("log_space_limit=%s "
"log_space_total=%s "
"ignore_log_space_limit=%d "
"sql_force_rotate_relay=%d",
llstr(rli->log_space_limit,llbuf1),
llstr(rli->log_space_total,llbuf2),
(int) rli->ignore_log_space_limit,
(int) rli->sql_force_rotate_relay));
}
#endif
if (rli->sql_force_rotate_relay)
{
mysql_mutex_lock(&mi->data_lock);
rotate_relay_log(rli->mi);
mysql_mutex_unlock(&mi->data_lock);
rli->sql_force_rotate_relay= false;
}
}
DBUG_RETURN(slave_killed);
}
/*
Builds a Rotate from the ignored events' info and writes it to relay log.
SYNOPSIS
write_ignored_events_info_to_relay_log()
thd pointer to I/O thread's thd
mi
DESCRIPTION
Slave I/O thread, going to die, must leave a durable trace of the
ignored events' end position for the use of the slave SQL thread, by
calling this function. Only that thread can call it (see assertion).
*/
static void write_ignored_events_info_to_relay_log(THD *thd, Master_info *mi)
{
Relay_log_info *rli= &mi->rli;
mysql_mutex_t *log_lock= rli->relay_log.get_log_lock();
DBUG_ENTER("write_ignored_events_info_to_relay_log");
DBUG_ASSERT(thd == mi->io_thd);
mysql_mutex_lock(log_lock);
if (rli->ign_master_log_name_end[0] || rli->ign_gtids.count())
{
Rotate_log_event *rev= NULL;
Gtid_list_log_event *glev= NULL;
if (rli->ign_master_log_name_end[0])
{
rev= new Rotate_log_event(rli->ign_master_log_name_end,
0, rli->ign_master_log_pos_end,
Rotate_log_event::DUP_NAME);
rli->ign_master_log_name_end[0]= 0;
if (unlikely(!(bool)rev))
mi->report(ERROR_LEVEL, ER_SLAVE_CREATE_EVENT_FAILURE, NULL,
ER(ER_SLAVE_CREATE_EVENT_FAILURE),
"Rotate_event (out of memory?),"
" SHOW SLAVE STATUS may be inaccurate");
}
if (rli->ign_gtids.count())
{
glev= new Gtid_list_log_event(&rli->ign_gtids,
Gtid_list_log_event::FLAG_IGN_GTIDS);
rli->ign_gtids.reset();
if (unlikely(!(bool)glev))
mi->report(ERROR_LEVEL, ER_SLAVE_CREATE_EVENT_FAILURE, NULL,
ER(ER_SLAVE_CREATE_EVENT_FAILURE),
"Gtid_list_event (out of memory?),"
" gtid_slave_pos may be inaccurate");
}
/* Can unlock before writing as slave SQL thd will soon see our event. */
mysql_mutex_unlock(log_lock);
if (rev)
{
DBUG_PRINT("info",("writing a Rotate event to track down ignored events"));
rev->server_id= 0; // don't be ignored by slave SQL thread
if (unlikely(rli->relay_log.append(rev)))
mi->report(ERROR_LEVEL, ER_SLAVE_RELAY_LOG_WRITE_FAILURE, NULL,
ER(ER_SLAVE_RELAY_LOG_WRITE_FAILURE),
"failed to write a Rotate event"
" to the relay log, SHOW SLAVE STATUS may be"
" inaccurate");
delete rev;
}
if (glev)
{
DBUG_PRINT("info",("writing a Gtid_list event to track down ignored events"));
glev->server_id= 0; // don't be ignored by slave SQL thread
glev->set_artificial_event(); // Don't mess up Exec_Master_Log_Pos
if (unlikely(rli->relay_log.append(glev)))
mi->report(ERROR_LEVEL, ER_SLAVE_RELAY_LOG_WRITE_FAILURE, NULL,
ER(ER_SLAVE_RELAY_LOG_WRITE_FAILURE),
"failed to write a Gtid_list event to the relay log, "
"gtid_slave_pos may be inaccurate");
delete glev;
}
if (likely (rev || glev))
{
rli->relay_log.harvest_bytes_written(&rli->log_space_total);
if (flush_master_info(mi, TRUE, TRUE))
sql_print_error("Failed to flush master info file");
}
}
else
mysql_mutex_unlock(log_lock);
DBUG_VOID_RETURN;
}
int register_slave_on_master(MYSQL* mysql, Master_info *mi,
bool *suppress_warnings)
{
uchar buf[1024], *pos= buf;
uint report_host_len=0, report_user_len=0, report_password_len=0;
DBUG_ENTER("register_slave_on_master");
*suppress_warnings= FALSE;
if (report_host)
report_host_len= strlen(report_host);
if (report_host_len > HOSTNAME_LENGTH)
{
sql_print_warning("The length of report_host is %d. "
"It is larger than the max length(%d), so this "
"slave cannot be registered to the master.",
report_host_len, HOSTNAME_LENGTH);
DBUG_RETURN(0);
}
if (report_user)
report_user_len= strlen(report_user);
if (report_user_len > USERNAME_LENGTH)
{
sql_print_warning("The length of report_user is %d. "
"It is larger than the max length(%d), so this "
"slave cannot be registered to the master.",
report_user_len, USERNAME_LENGTH);
DBUG_RETURN(0);
}
if (report_password)
report_password_len= strlen(report_password);
if (report_password_len > MAX_PASSWORD_LENGTH)
{
sql_print_warning("The length of report_password is %d. "
"It is larger than the max length(%d), so this "
"slave cannot be registered to the master.",
report_password_len, MAX_PASSWORD_LENGTH);
DBUG_RETURN(0);
}
int4store(pos, global_system_variables.server_id); pos+= 4;
pos= net_store_data(pos, (uchar*) report_host, report_host_len);
pos= net_store_data(pos, (uchar*) report_user, report_user_len);
pos= net_store_data(pos, (uchar*) report_password, report_password_len);
int2store(pos, (uint16) report_port); pos+= 2;
/*
Fake rpl_recovery_rank, which was removed in BUG#13963,
so that this server can register itself on old servers,
see BUG#49259.
*/
int4store(pos, /* rpl_recovery_rank */ 0); pos+= 4;
/* The master will fill in master_id */
int4store(pos, 0); pos+= 4;
if (simple_command(mysql, COM_REGISTER_SLAVE, buf, (size_t) (pos- buf), 0))
{
if (mysql_errno(mysql) == ER_NET_READ_INTERRUPTED)
{
*suppress_warnings= TRUE; // Suppress reconnect warning
}
else if (!check_io_slave_killed(mi, NULL))
{
char buf[256];
my_snprintf(buf, sizeof(buf), "%s (Errno: %d)", mysql_error(mysql),
mysql_errno(mysql));
mi->report(ERROR_LEVEL, ER_SLAVE_MASTER_COM_FAILURE, NULL,
ER(ER_SLAVE_MASTER_COM_FAILURE), "COM_REGISTER_SLAVE", buf);
}
DBUG_RETURN(1);
}
DBUG_RETURN(0);
}
/**
Execute a SHOW SLAVE STATUS statement.
@param thd Pointer to THD object for the client thread executing the
statement.
@param mi Pointer to Master_info object for the IO thread.
@retval FALSE success
@retval TRUE failure
*/
bool show_master_info(THD *thd, Master_info *mi, bool full)
{
DBUG_ENTER("show_master_info");
String gtid_pos;
if (full && rpl_global_gtid_slave_state.tostring(>id_pos, NULL, 0))
DBUG_RETURN(TRUE);
if (send_show_master_info_header(thd, full, gtid_pos.length()))
DBUG_RETURN(TRUE);
if (send_show_master_info_data(thd, mi, full, >id_pos))
DBUG_RETURN(TRUE);
my_eof(thd);
DBUG_RETURN(FALSE);
}
static bool send_show_master_info_header(THD *thd, bool full,
size_t gtid_pos_length)
{
List<Item> field_list;
Protocol *protocol= thd->protocol;
Master_info *mi;
DBUG_ENTER("show_master_info_header");
if (full)
{
field_list.push_back(new Item_empty_string("Connection_name",
MAX_CONNECTION_NAME));
field_list.push_back(new Item_empty_string("Slave_SQL_State",
30));
}
field_list.push_back(new Item_empty_string("Slave_IO_State",
30));
field_list.push_back(new Item_empty_string("Master_Host",
sizeof(mi->host)));
field_list.push_back(new Item_empty_string("Master_User",
sizeof(mi->user)));
field_list.push_back(new Item_return_int("Master_Port", 7,
MYSQL_TYPE_LONG));
field_list.push_back(new Item_return_int("Connect_Retry", 10,
MYSQL_TYPE_LONG));
field_list.push_back(new Item_empty_string("Master_Log_File",
FN_REFLEN));
field_list.push_back(new Item_return_int("Read_Master_Log_Pos", 10,
MYSQL_TYPE_LONGLONG));
field_list.push_back(new Item_empty_string("Relay_Log_File",
FN_REFLEN));
field_list.push_back(new Item_return_int("Relay_Log_Pos", 10,
MYSQL_TYPE_LONGLONG));
field_list.push_back(new Item_empty_string("Relay_Master_Log_File",
FN_REFLEN));
field_list.push_back(new Item_empty_string("Slave_IO_Running", 3));
field_list.push_back(new Item_empty_string("Slave_SQL_Running", 3));
field_list.push_back(new Item_empty_string("Replicate_Do_DB", 20));
field_list.push_back(new Item_empty_string("Replicate_Ignore_DB", 20));
field_list.push_back(new Item_empty_string("Replicate_Do_Table", 20));
field_list.push_back(new Item_empty_string("Replicate_Ignore_Table", 23));
field_list.push_back(new Item_empty_string("Replicate_Wild_Do_Table", 24));
field_list.push_back(new Item_empty_string("Replicate_Wild_Ignore_Table",
28));
field_list.push_back(new Item_return_int("Last_Errno", 4, MYSQL_TYPE_LONG));
field_list.push_back(new Item_empty_string("Last_Error", 20));
field_list.push_back(new Item_return_int("Skip_Counter", 10,
MYSQL_TYPE_LONG));
field_list.push_back(new Item_return_int("Exec_Master_Log_Pos", 10,
MYSQL_TYPE_LONGLONG));
field_list.push_back(new Item_return_int("Relay_Log_Space", 10,
MYSQL_TYPE_LONGLONG));
field_list.push_back(new Item_empty_string("Until_Condition", 6));
field_list.push_back(new Item_empty_string("Until_Log_File", FN_REFLEN));
field_list.push_back(new Item_return_int("Until_Log_Pos", 10,
MYSQL_TYPE_LONGLONG));
field_list.push_back(new Item_empty_string("Master_SSL_Allowed", 7));
field_list.push_back(new Item_empty_string("Master_SSL_CA_File",
sizeof(mi->ssl_ca)));
field_list.push_back(new Item_empty_string("Master_SSL_CA_Path",
sizeof(mi->ssl_capath)));
field_list.push_back(new Item_empty_string("Master_SSL_Cert",
sizeof(mi->ssl_cert)));
field_list.push_back(new Item_empty_string("Master_SSL_Cipher",
sizeof(mi->ssl_cipher)));
field_list.push_back(new Item_empty_string("Master_SSL_Key",
sizeof(mi->ssl_key)));
field_list.push_back(new Item_return_int("Seconds_Behind_Master", 10,
MYSQL_TYPE_LONGLONG));
field_list.push_back(new Item_empty_string("Master_SSL_Verify_Server_Cert",
3));
field_list.push_back(new Item_return_int("Last_IO_Errno", 4, MYSQL_TYPE_LONG));
field_list.push_back(new Item_empty_string("Last_IO_Error", 20));
field_list.push_back(new Item_return_int("Last_SQL_Errno", 4, MYSQL_TYPE_LONG));
field_list.push_back(new Item_empty_string("Last_SQL_Error", 20));
field_list.push_back(new Item_empty_string("Replicate_Ignore_Server_Ids",
FN_REFLEN));
field_list.push_back(new Item_return_int("Master_Server_Id", sizeof(ulong),
MYSQL_TYPE_LONG));
field_list.push_back(new Item_empty_string("Master_SSL_Crl",
sizeof(mi->ssl_crl)));
field_list.push_back(new Item_empty_string("Master_SSL_Crlpath",
sizeof(mi->ssl_crlpath)));
field_list.push_back(new Item_empty_string("Using_Gtid",
sizeof("Current_Pos")-1));
field_list.push_back(new Item_empty_string("Gtid_IO_Pos", 30));
if (full)
{
field_list.push_back(new Item_return_int("Retried_transactions",
10, MYSQL_TYPE_LONG));
field_list.push_back(new Item_return_int("Max_relay_log_size",
10, MYSQL_TYPE_LONGLONG));
field_list.push_back(new Item_return_int("Executed_log_entries",
10, MYSQL_TYPE_LONG));
field_list.push_back(new Item_return_int("Slave_received_heartbeats",
10, MYSQL_TYPE_LONG));
field_list.push_back(new Item_float("Slave_heartbeat_period",
0.0, 3, 10));
field_list.push_back(new Item_empty_string("Gtid_Slave_Pos",
gtid_pos_length));
}
if (protocol->send_result_set_metadata(&field_list,
Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF))
DBUG_RETURN(TRUE);
DBUG_RETURN(FALSE);
}
static bool send_show_master_info_data(THD *thd, Master_info *mi, bool full,
String *gtid_pos)
{
DBUG_ENTER("send_show_master_info_data");
if (mi->host[0])
{
DBUG_PRINT("info",("host is set: '%s'", mi->host));
String *packet= &thd->packet;
Protocol *protocol= thd->protocol;
Rpl_filter *rpl_filter= mi->rpl_filter;
char buf[256];
String tmp(buf, sizeof(buf), &my_charset_bin);
protocol->prepare_for_resend();
/*
slave_running can be accessed without run_lock but not other
non-volotile members like mi->io_thd, which is guarded by the mutex.
*/
if (full)
protocol->store(mi->connection_name.str, mi->connection_name.length,
&my_charset_bin);
mysql_mutex_lock(&mi->run_lock);
if (full)
{
/*
Show what the sql driver replication thread is doing
This is only meaningful if there is only one slave thread.
*/
protocol->store(mi->rli.sql_driver_thd ?
mi->rli.sql_driver_thd->get_proc_info() : "",
&my_charset_bin);
}
protocol->store(mi->io_thd ? mi->io_thd->get_proc_info() : "", &my_charset_bin);
mysql_mutex_unlock(&mi->run_lock);
mysql_mutex_lock(&mi->data_lock);
mysql_mutex_lock(&mi->rli.data_lock);
mysql_mutex_lock(&mi->err_lock);
mysql_mutex_lock(&mi->rli.err_lock);
protocol->store(mi->host, &my_charset_bin);
protocol->store(mi->user, &my_charset_bin);
protocol->store((uint32) mi->port);
protocol->store((uint32) mi->connect_retry);
protocol->store(mi->master_log_name, &my_charset_bin);
protocol->store((ulonglong) mi->master_log_pos);
protocol->store(mi->rli.group_relay_log_name +
dirname_length(mi->rli.group_relay_log_name),
&my_charset_bin);
protocol->store((ulonglong) mi->rli.group_relay_log_pos);
protocol->store(mi->rli.group_master_log_name, &my_charset_bin);
protocol->store(mi->slave_running == MYSQL_SLAVE_RUN_CONNECT ?
"Yes" : (mi->slave_running == MYSQL_SLAVE_RUN_NOT_CONNECT ?
"Connecting" : "No"), &my_charset_bin);
protocol->store(mi->rli.slave_running ? "Yes":"No", &my_charset_bin);
protocol->store(rpl_filter->get_do_db());
protocol->store(rpl_filter->get_ignore_db());
rpl_filter->get_do_table(&tmp);
protocol->store(&tmp);
rpl_filter->get_ignore_table(&tmp);
protocol->store(&tmp);
rpl_filter->get_wild_do_table(&tmp);
protocol->store(&tmp);
rpl_filter->get_wild_ignore_table(&tmp);
protocol->store(&tmp);
protocol->store(mi->rli.last_error().number);
protocol->store(mi->rli.last_error().message, &my_charset_bin);
protocol->store((uint32) mi->rli.slave_skip_counter);
protocol->store((ulonglong) mi->rli.group_master_log_pos);
protocol->store((ulonglong) mi->rli.log_space_total);
protocol->store(
mi->rli.until_condition==Relay_log_info::UNTIL_NONE ? "None":
( mi->rli.until_condition==Relay_log_info::UNTIL_MASTER_POS? "Master":
( mi->rli.until_condition==Relay_log_info::UNTIL_RELAY_POS? "Relay":
"Gtid")), &my_charset_bin);
protocol->store(mi->rli.until_log_name, &my_charset_bin);
protocol->store((ulonglong) mi->rli.until_log_pos);
#ifdef HAVE_OPENSSL
protocol->store(mi->ssl? "Yes":"No", &my_charset_bin);
#else
protocol->store(mi->ssl? "Ignored":"No", &my_charset_bin);
#endif
protocol->store(mi->ssl_ca, &my_charset_bin);
protocol->store(mi->ssl_capath, &my_charset_bin);
protocol->store(mi->ssl_cert, &my_charset_bin);
protocol->store(mi->ssl_cipher, &my_charset_bin);
protocol->store(mi->ssl_key, &my_charset_bin);
/*
Seconds_Behind_Master: if SQL thread is running and I/O thread is
connected, we can compute it otherwise show NULL (i.e. unknown).
*/
if ((mi->slave_running == MYSQL_SLAVE_RUN_CONNECT) &&
mi->rli.slave_running)
{
long time_diff;
bool idle;
time_t stamp= mi->rli.last_master_timestamp;
if (!stamp)
idle= true;
else
{
idle= mi->rli.sql_thread_caught_up;
if (opt_slave_parallel_threads > 0 && idle &&
!mi->rli.parallel.workers_idle())
idle= false;
}
if (idle)
time_diff= 0;
else
{
time_diff= ((long)(time(0) - stamp) - mi->clock_diff_with_master);
/*
Apparently on some systems time_diff can be <0. Here are possible
reasons related to MySQL:
- the master is itself a slave of another master whose time is ahead.
- somebody used an explicit SET TIMESTAMP on the master.
Possible reason related to granularity-to-second of time functions
(nothing to do with MySQL), which can explain a value of -1:
assume the master's and slave's time are perfectly synchronized, and
that at slave's connection time, when the master's timestamp is read,
it is at the very end of second 1, and (a very short time later) when
the slave's timestamp is read it is at the very beginning of second
2. Then the recorded value for master is 1 and the recorded value for
slave is 2. At SHOW SLAVE STATUS time, assume that the difference
between timestamp of slave and rli->last_master_timestamp is 0
(i.e. they are in the same second), then we get 0-(2-1)=-1 as a result.
This confuses users, so we don't go below 0.
last_master_timestamp == 0 (an "impossible" timestamp 1970) is a
special marker to say "consider we have caught up".
*/
if (time_diff < 0)
time_diff= 0;
}
protocol->store((longlong)time_diff);
}
else
{
protocol->store_null();
}
protocol->store(mi->ssl_verify_server_cert? "Yes":"No", &my_charset_bin);
// Last_IO_Errno
protocol->store(mi->last_error().number);
// Last_IO_Error
protocol->store(mi->last_error().message, &my_charset_bin);
// Last_SQL_Errno
protocol->store(mi->rli.last_error().number);
// Last_SQL_Error
protocol->store(mi->rli.last_error().message, &my_charset_bin);
// Replicate_Ignore_Server_Ids
{
char buff[FN_REFLEN];
ulong i, cur_len;
for (i= 0, buff[0]= 0, cur_len= 0;
i < mi->ignore_server_ids.elements; i++)
{
ulong s_id, slen;
char sbuff[FN_REFLEN];
get_dynamic(&mi->ignore_server_ids, (uchar*) &s_id, i);
slen= sprintf(sbuff, (i==0? "%lu" : ", %lu"), s_id);
if (cur_len + slen + 4 > FN_REFLEN)
{
/*
break the loop whenever remained space could not fit
ellipses on the next cycle
*/
sprintf(buff + cur_len, "...");
break;
}
cur_len += sprintf(buff + cur_len, "%s", sbuff);
}
protocol->store(buff, &my_charset_bin);
}
// Master_Server_id
protocol->store((uint32) mi->master_id);
// Master_Ssl_Crl
protocol->store(mi->ssl_ca, &my_charset_bin);
// Master_Ssl_Crlpath
protocol->store(mi->ssl_capath, &my_charset_bin);
protocol->store(mi->using_gtid_astext(mi->using_gtid), &my_charset_bin);
{
char buff[30];
String tmp(buff, sizeof(buff), system_charset_info);
mi->gtid_current_pos.to_string(&tmp);
protocol->store(tmp.ptr(), tmp.length(), &my_charset_bin);
}
if (full)
{
protocol->store((uint32) mi->rli.retried_trans);
protocol->store((ulonglong) mi->rli.max_relay_log_size);
protocol->store((uint32) mi->rli.executed_entries);
protocol->store((uint32) mi->received_heartbeats);
protocol->store((double) mi->heartbeat_period, 3, &tmp);
protocol->store(gtid_pos->ptr(), gtid_pos->length(), &my_charset_bin);
}
mysql_mutex_unlock(&mi->rli.err_lock);
mysql_mutex_unlock(&mi->err_lock);
mysql_mutex_unlock(&mi->rli.data_lock);
mysql_mutex_unlock(&mi->data_lock);
if (my_net_write(&thd->net, (uchar*) thd->packet.ptr(), packet->length()))
DBUG_RETURN(TRUE);
}
DBUG_RETURN(FALSE);
}
/* Used to sort connections by name */
static int cmp_mi_by_name(const Master_info **arg1,
const Master_info **arg2)
{
return my_strcasecmp(system_charset_info, (*arg1)->connection_name.str,
(*arg2)->connection_name.str);
}
/**
Execute a SHOW FULL SLAVE STATUS statement.
@param thd Pointer to THD object for the client thread executing the
statement.
Elements are sorted according to the original connection_name.
@retval FALSE success
@retval TRUE failure
@note
master_info_index is protected by LOCK_active_mi.
*/
bool show_all_master_info(THD* thd)
{
uint i, elements;
String gtid_pos;
Master_info **tmp;
DBUG_ENTER("show_master_info");
mysql_mutex_assert_owner(&LOCK_active_mi);
gtid_pos.length(0);
if (rpl_append_gtid_state(>id_pos, true))
{
my_error(ER_OUT_OF_RESOURCES, MYF(0));
DBUG_RETURN(TRUE);
}
if (send_show_master_info_header(thd, 1, gtid_pos.length()))
DBUG_RETURN(TRUE);
if (!master_info_index ||
!(elements= master_info_index->master_info_hash.records))
goto end;
/*
Sort lines to get them into a predicted order
(needed for test cases and to not confuse users)
*/
if (!(tmp= (Master_info**) thd->alloc(sizeof(Master_info*) * elements)))
DBUG_RETURN(TRUE);
for (i= 0; i < elements; i++)
{
tmp[i]= (Master_info *) my_hash_element(&master_info_index->
master_info_hash, i);
}
my_qsort(tmp, elements, sizeof(Master_info*), (qsort_cmp) cmp_mi_by_name);
for (i= 0; i < elements; i++)
{
if (send_show_master_info_data(thd, tmp[i], 1, >id_pos))
DBUG_RETURN(TRUE);
}
end:
my_eof(thd);
DBUG_RETURN(FALSE);
}
void set_slave_thread_options(THD* thd)
{
DBUG_ENTER("set_slave_thread_options");
/*
It's nonsense to constrain the slave threads with max_join_size; if a
query succeeded on master, we HAVE to execute it. So set
OPTION_BIG_SELECTS. Setting max_join_size to HA_POS_ERROR is not enough
(and it's not needed if we have OPTION_BIG_SELECTS) because an INSERT
SELECT examining more than 4 billion rows would still fail (yes, because
when max_join_size is 4G, OPTION_BIG_SELECTS is automatically set, but
only for client threads.
*/
ulonglong options= thd->variables.option_bits | OPTION_BIG_SELECTS;
if (opt_log_slave_updates)
options|= OPTION_BIN_LOG;
else
options&= ~OPTION_BIN_LOG;
thd->variables.option_bits= options;
thd->variables.completion_type= 0;
DBUG_VOID_RETURN;
}
void set_slave_thread_default_charset(THD* thd, rpl_group_info *rgi)
{
DBUG_ENTER("set_slave_thread_default_charset");
thd->variables.character_set_client=
global_system_variables.character_set_client;
thd->variables.collation_connection=
global_system_variables.collation_connection;
thd->variables.collation_server=
global_system_variables.collation_server;
thd->update_charset();
thd->system_thread_info.rpl_sql_info->cached_charset_invalidate();
DBUG_VOID_RETURN;
}
/*
init_slave_thread()
*/
static int init_slave_thread(THD* thd, Master_info *mi,
SLAVE_THD_TYPE thd_type)
{
DBUG_ENTER("init_slave_thread");
int simulate_error __attribute__((unused))= 0;
DBUG_EXECUTE_IF("simulate_io_slave_error_on_init",
simulate_error|= (1 << SLAVE_THD_IO););
DBUG_EXECUTE_IF("simulate_sql_slave_error_on_init",
simulate_error|= (1 << SLAVE_THD_SQL););
/* We must call store_globals() before doing my_net_init() */
if (init_thr_lock() || thd->store_globals() ||
my_net_init(&thd->net, 0, MYF(MY_THREAD_SPECIFIC)) ||
IF_DBUG(simulate_error & (1<< thd_type), 0))
{
thd->cleanup();
DBUG_RETURN(-1);
}
thd->system_thread = (thd_type == SLAVE_THD_SQL) ?
SYSTEM_THREAD_SLAVE_SQL : SYSTEM_THREAD_SLAVE_IO;
thd->security_ctx->skip_grants();
thd->slave_thread= 1;
thd->connection_name= mi->connection_name;
thd->enable_slow_log= opt_log_slow_slave_statements;
thd->variables.log_slow_filter= global_system_variables.log_slow_filter;
set_slave_thread_options(thd);
thd->client_capabilities = CLIENT_LOCAL_FILES;
mysql_mutex_lock(&LOCK_thread_count);
thd->thread_id= thd->variables.pseudo_thread_id= thread_id++;
mysql_mutex_unlock(&LOCK_thread_count);
if (thd_type == SLAVE_THD_SQL)
THD_STAGE_INFO(thd, stage_waiting_for_the_next_event_in_relay_log);
else
THD_STAGE_INFO(thd, stage_waiting_for_master_update);
thd->set_time();
/* Do not use user-supplied timeout value for system threads. */
thd->variables.lock_wait_timeout= LONG_TIMEOUT;
DBUG_RETURN(0);
}
/*
Sleep for a given amount of time or until killed.
@param thd Thread context of the current thread.
@param seconds The number of seconds to sleep.
@param func Function object to check if the thread has been killed.
@param info The Rpl_info object associated with this sleep.
@retval True if the thread has been killed, false otherwise.
*/
template <typename killed_func, typename rpl_info>
static bool slave_sleep(THD *thd, time_t seconds,
killed_func func, rpl_info info)
{
bool ret;
struct timespec abstime;
mysql_mutex_t *lock= &info->sleep_lock;
mysql_cond_t *cond= &info->sleep_cond;
/* Absolute system time at which the sleep time expires. */
set_timespec(abstime, seconds);
mysql_mutex_lock(lock);
thd->ENTER_COND(cond, lock, NULL, NULL);
while (! (ret= func(info)))
{
int error= mysql_cond_timedwait(cond, lock, &abstime);
if (error == ETIMEDOUT || error == ETIME)
break;
}
/* Implicitly unlocks the mutex. */
thd->EXIT_COND(NULL);
return ret;
}
static int request_dump(THD *thd, MYSQL* mysql, Master_info* mi,
bool *suppress_warnings)
{
uchar buf[FN_REFLEN + 10];
int len;
ushort binlog_flags = 0; // for now
char* logname = mi->master_log_name;
DBUG_ENTER("request_dump");
*suppress_warnings= FALSE;
if (opt_log_slave_updates && opt_replicate_annotate_row_events)
binlog_flags|= BINLOG_SEND_ANNOTATE_ROWS_EVENT;
if (RUN_HOOK(binlog_relay_io,
before_request_transmit,
(thd, mi, binlog_flags)))
DBUG_RETURN(1);
// TODO if big log files: Change next to int8store()
int4store(buf, (ulong) mi->master_log_pos);
int2store(buf + 4, binlog_flags);
int4store(buf + 6, global_system_variables.server_id);
len = (uint) strlen(logname);
memcpy(buf + 10, logname,len);
if (simple_command(mysql, COM_BINLOG_DUMP, buf, len + 10, 1))
{
/*
Something went wrong, so we will just reconnect and retry later
in the future, we should do a better error analysis, but for
now we just fill up the error log :-)
*/
if (mysql_errno(mysql) == ER_NET_READ_INTERRUPTED)
*suppress_warnings= TRUE; // Suppress reconnect warning
else
sql_print_error("Error on COM_BINLOG_DUMP: %d %s, will retry in %d secs",
mysql_errno(mysql), mysql_error(mysql),
mi->connect_retry);
DBUG_RETURN(1);
}
DBUG_RETURN(0);
}
/*
Read one event from the master
SYNOPSIS
read_event()
mysql MySQL connection
mi Master connection information
suppress_warnings TRUE when a normal net read timeout has caused us to
try a reconnect. We do not want to print anything to
the error log in this case because this a anormal
event in an idle server.
RETURN VALUES
'packet_error' Error
number Length of packet
*/
static ulong read_event(MYSQL* mysql, Master_info *mi, bool* suppress_warnings)
{
ulong len;
DBUG_ENTER("read_event");
*suppress_warnings= FALSE;
/*
my_real_read() will time us out
We check if we were told to die, and if not, try reading again
*/
#ifndef DBUG_OFF
if (disconnect_slave_event_count && !(mi->events_till_disconnect--))
DBUG_RETURN(packet_error);
#endif
len = cli_safe_read(mysql);
if (len == packet_error || (long) len < 1)
{
if (mysql_errno(mysql) == ER_NET_READ_INTERRUPTED)
{
/*
We are trying a normal reconnect after a read timeout;
we suppress prints to .err file as long as the reconnect
happens without problems
*/
*suppress_warnings= TRUE;
}
else
sql_print_error("Error reading packet from server: %s ( server_errno=%d)",
mysql_error(mysql), mysql_errno(mysql));
DBUG_RETURN(packet_error);
}
/* Check if eof packet */
if (len < 8 && mysql->net.read_pos[0] == 254)
{
sql_print_information("Slave: received end packet from server, apparent "
"master shutdown: %s",
mysql_error(mysql));
DBUG_RETURN(packet_error);
}
DBUG_PRINT("exit", ("len: %lu net->read_pos[4]: %d",
len, mysql->net.read_pos[4]));
DBUG_RETURN(len - 1);
}
/*
Check if the current error is of temporary nature of not.
Some errors are temporary in nature, such as
ER_LOCK_DEADLOCK and ER_LOCK_WAIT_TIMEOUT. Ndb also signals
that the error is temporary by pushing a warning with the error code
ER_GET_TEMPORARY_ERRMSG, if the originating error is temporary.
*/
int
has_temporary_error(THD *thd)
{
DBUG_ENTER("has_temporary_error");
DBUG_EXECUTE_IF("all_errors_are_temporary_errors",
if (thd->get_stmt_da()->is_error())
{
thd->clear_error();
my_error(ER_LOCK_DEADLOCK, MYF(0));
});
/*
If there is no message in THD, we can't say if it's a temporary
error or not. This is currently the case for Incident_log_event,
which sets no message. Return FALSE.
*/
if (!thd->is_error())
DBUG_RETURN(0);
/*
Temporary error codes:
currently, InnoDB deadlock detected by InnoDB or lock
wait timeout (innodb_lock_wait_timeout exceeded
*/
if (thd->get_stmt_da()->sql_errno() == ER_LOCK_DEADLOCK ||
thd->get_stmt_da()->sql_errno() == ER_LOCK_WAIT_TIMEOUT)
DBUG_RETURN(1);
#ifdef HAVE_NDB_BINLOG
/*
currently temporary error set in ndbcluster
*/
List_iterator_fast<Sql_condition> it(thd->warning_info->warn_list());
Sql_condition *err;
while ((err= it++))
{
DBUG_PRINT("info", ("has condition %d %s", err->get_sql_errno(),
err->get_message_text()));
switch (err->get_sql_errno())
{
case ER_GET_TEMPORARY_ERRMSG:
DBUG_RETURN(1);
default:
break;
}
}
#endif
DBUG_RETURN(0);
}
/**
Applies the given event and advances the relay log position.
In essence, this function does:
@code
ev->apply_event(rli);
ev->update_pos(rli);
@endcode
But it also does some maintainance, such as skipping events if
needed and reporting errors.
If the @c skip flag is set, then it is tested whether the event
should be skipped, by looking at the slave_skip_counter and the
server id. The skip flag should be set when calling this from a
replication thread but not set when executing an explicit BINLOG
statement.
@retval 0 OK.
@retval 1 Error calling ev->apply_event().
@retval 2 No error calling ev->apply_event(), but error calling
ev->update_pos().
*/
int apply_event_and_update_pos(Log_event* ev, THD* thd,
rpl_group_info *rgi,
rpl_parallel_thread *rpt)
{
int exec_res= 0;
Relay_log_info* rli= rgi->rli;
DBUG_ENTER("apply_event_and_update_pos");
DBUG_PRINT("exec_event",("%s(type_code: %d; server_id: %d)",
ev->get_type_str(), ev->get_type_code(),
ev->server_id));
DBUG_PRINT("info", ("thd->options: '%s%s%s' rgi->last_event_start_time: %lu",
FLAGSTR(thd->variables.option_bits, OPTION_NOT_AUTOCOMMIT),
FLAGSTR(thd->variables.option_bits, OPTION_BEGIN),
FLAGSTR(thd->variables.option_bits, OPTION_GTID_BEGIN),
(ulong) rgi->last_event_start_time));
/*
Execute the event to change the database and update the binary
log coordinates, but first we set some data that is needed for
the thread.
The event will be executed unless it is supposed to be skipped.
Queries originating from this server must be skipped. Low-level
events (Format_description_log_event, Rotate_log_event,
Stop_log_event) from this server must also be skipped. But for
those we don't want to modify 'group_master_log_pos', because
these events did not exist on the master.
Format_description_log_event is not completely skipped.
Skip queries specified by the user in 'slave_skip_counter'. We
can't however skip events that has something to do with the log
files themselves.
Filtering on own server id is extremely important, to ignore
execution of events created by the creation/rotation of the relay
log (remember that now the relay log starts with its Format_desc,
has a Rotate etc).
*/
/* Use the original server id for logging. */
thd->variables.server_id = ev->server_id;
thd->set_time(); // time the query
thd->lex->current_select= 0;
if (!ev->when)
{
my_hrtime_t hrtime= my_hrtime();
ev->when= hrtime_to_my_time(hrtime);
ev->when_sec_part= hrtime_sec_part(hrtime);
}
thd->variables.option_bits=
(thd->variables.option_bits & ~OPTION_SKIP_REPLICATION) |
(ev->flags & LOG_EVENT_SKIP_REPLICATION_F ? OPTION_SKIP_REPLICATION : 0);
ev->thd = thd; // because up to this point, ev->thd == 0
int reason= ev->shall_skip(rgi);
if (reason == Log_event::EVENT_SKIP_COUNT)
{
DBUG_ASSERT(rli->slave_skip_counter > 0);
rli->slave_skip_counter--;
}
mysql_mutex_unlock(&rli->data_lock);
DBUG_EXECUTE_IF("inject_slave_sql_before_apply_event",
{
DBUG_ASSERT(!debug_sync_set_action
(thd, STRING_WITH_LEN("now WAIT_FOR continue")));
DBUG_SET_INITIAL("-d,inject_slave_sql_before_apply_event");
};);
if (reason == Log_event::EVENT_SKIP_NOT)
exec_res= ev->apply_event(rgi);
#ifndef DBUG_OFF
/*
This only prints information to the debug trace.
TODO: Print an informational message to the error log?
*/
static const char *const explain[] = {
// EVENT_SKIP_NOT,
"not skipped",
// EVENT_SKIP_IGNORE,
"skipped because event should be ignored",
// EVENT_SKIP_COUNT
"skipped because event skip counter was non-zero"
};
DBUG_PRINT("info", ("OPTION_BEGIN: %d IN_STMT: %d IN_TRANSACTION: %d",
MY_TEST(thd->variables.option_bits & OPTION_BEGIN),
rli->get_flag(Relay_log_info::IN_STMT),
rli->get_flag(Relay_log_info::IN_TRANSACTION)));
DBUG_PRINT("skip_event", ("%s event was %s",
ev->get_type_str(), explain[reason]));
#endif
DBUG_PRINT("info", ("apply_event error = %d", exec_res));
if (exec_res == 0)
{
int error= ev->update_pos(rgi);
#ifdef HAVE_valgrind
if (!rli->is_fake)
#endif
{
#ifndef DBUG_OFF
char buf[22];
#endif
DBUG_PRINT("info", ("update_pos error = %d", error));
DBUG_PRINT("info", ("group %s %s",
llstr(rli->group_relay_log_pos, buf),
rli->group_relay_log_name));
DBUG_PRINT("info", ("event %s %s",
llstr(rli->event_relay_log_pos, buf),
rli->event_relay_log_name));
}
/*
The update should not fail, so print an error message and
return an error code.
TODO: Replace this with a decent error message when merged
with BUG#24954 (which adds several new error message).
*/
if (error)
{
char buf[22];
rli->report(ERROR_LEVEL, ER_UNKNOWN_ERROR, rgi->gtid_info(),
"It was not possible to update the positions"
" of the relay log information: the slave may"
" be in an inconsistent state."
" Stopped in %s position %s",
rli->group_relay_log_name,
llstr(rli->group_relay_log_pos, buf));
DBUG_RETURN(2);
}
}
else
{
/*
Make sure we do not errorneously update gtid_slave_pos with a lingering
GTID from this failed event group (MDEV-4906).
*/
rgi->gtid_pending= false;
}
DBUG_RETURN(exec_res ? 1 : 0);
}
/**
Keep the relay log transaction state up to date.
The state reflects how things are after the given event, that has just been
read from the relay log, is executed.
This is only needed to ensure we:
- Don't abort the sql driver thread in the middle of an event group.
- Don't rotate the io thread in the middle of a statement or transaction.
The mechanism is that the io thread, when it needs to rotate the relay
log, will wait until the sql driver has read all the cached events
and then continue reading events one by one from the master until
the sql threads signals that log doesn't have an active group anymore.
There are two possible cases. We keep them as 2 separate flags mainly
to make debugging easier.
- IN_STMT is set when we have read an event that should be used
together with the next event. This is for example setting a
variable that is used when executing the next statement.
- IN_TRANSACTION is set when we are inside a BEGIN...COMMIT group
To test the state one should use the is_in_group() function.
*/
inline void update_state_of_relay_log(Relay_log_info *rli, Log_event *ev)
{
Log_event_type typ= ev->get_type_code();
/* check if we are in a multi part event */
if (ev->is_part_of_group())
rli->set_flag(Relay_log_info::IN_STMT);
else if (Log_event::is_group_event(typ))
{
/*
If it was not a is_part_of_group() and not a group event (like
rotate) then we can reset the IN_STMT flag. We have the above
if only to allow us to have a rotate element anywhere.
*/
rli->clear_flag(Relay_log_info::IN_STMT);
}
/* Check for an event that starts or stops a transaction */
if (typ == QUERY_EVENT)
{
Query_log_event *qev= (Query_log_event*) ev;
/*
Trivial optimization to avoid the following somewhat expensive
checks.
*/
if (qev->q_len <= sizeof("ROLLBACK"))
{
if (qev->is_begin())
rli->set_flag(Relay_log_info::IN_TRANSACTION);
if (qev->is_commit() || qev->is_rollback())
rli->clear_flag(Relay_log_info::IN_TRANSACTION);
}
}
if (typ == XID_EVENT)
rli->clear_flag(Relay_log_info::IN_TRANSACTION);
if (typ == GTID_EVENT &&
!(((Gtid_log_event*) ev)->flags2 & Gtid_log_event::FL_STANDALONE))
{
/* This GTID_EVENT will generate a BEGIN event */
rli->set_flag(Relay_log_info::IN_TRANSACTION);
}
DBUG_PRINT("info", ("event: %u IN_STMT: %d IN_TRANSACTION: %d",
(uint) typ,
rli->get_flag(Relay_log_info::IN_STMT),
rli->get_flag(Relay_log_info::IN_TRANSACTION)));
}
/**
Top-level function for executing the next event from the relay log.
This function reads the event from the relay log, executes it, and
advances the relay log position. It also handles errors, etc.
This function may fail to apply the event for the following reasons:
- The position specfied by the UNTIL condition of the START SLAVE
command is reached.
- It was not possible to read the event from the log.
- The slave is killed.
- An error occurred when applying the event, and the event has been
tried slave_trans_retries times. If the event has been retried
fewer times, 0 is returned.
- init_master_info or init_relay_log_pos failed. (These are called
if a failure occurs when applying the event.)
- An error occurred when updating the binlog position.
@retval 0 The event was applied.
@retval 1 The event was not applied.
*/
static int exec_relay_log_event(THD* thd, Relay_log_info* rli,
rpl_group_info *serial_rgi)
{
ulonglong event_size;
DBUG_ENTER("exec_relay_log_event");
/*
We acquire this mutex since we need it for all operations except
event execution. But we will release it in places where we will
wait for something for example inside of next_event().
*/
mysql_mutex_lock(&rli->data_lock);
Log_event *ev= next_event(serial_rgi, &event_size);
if (sql_slave_killed(serial_rgi))
{
mysql_mutex_unlock(&rli->data_lock);
delete ev;
DBUG_RETURN(1);
}
if (ev)
{
int exec_res;
Log_event_type typ= ev->get_type_code();
/*
This tests if the position of the beginning of the current event
hits the UNTIL barrier.
*/
if ((rli->until_condition == Relay_log_info::UNTIL_MASTER_POS ||
rli->until_condition == Relay_log_info::UNTIL_RELAY_POS) &&
rli->is_until_satisfied(thd, ev))
{
char buf[22];
sql_print_information("Slave SQL thread stopped because it reached its"
" UNTIL position %s", llstr(rli->until_pos(), buf));
/*
Setting abort_slave flag because we do not want additional
message about error in query execution to be printed.
*/
rli->abort_slave= 1;
rli->stop_for_until= true;
mysql_mutex_unlock(&rli->data_lock);
delete ev;
DBUG_RETURN(1);
}
{ /**
The following failure injecion works in cooperation with tests
setting @@global.debug= 'd,incomplete_group_in_relay_log'.
Xid or Commit events are not executed to force the slave sql
read hanging if the realy log does not have any more events.
*/
DBUG_EXECUTE_IF("incomplete_group_in_relay_log",
if ((typ == XID_EVENT) ||
((typ == QUERY_EVENT) &&
strcmp("COMMIT", ((Query_log_event *) ev)->query) == 0))
{
DBUG_ASSERT(thd->transaction.all.modified_non_trans_table);
rli->abort_slave= 1;
mysql_mutex_unlock(&rli->data_lock);
delete ev;
serial_rgi->inc_event_relay_log_pos();
DBUG_RETURN(0);
};);
}
update_state_of_relay_log(rli, ev);
if (opt_slave_parallel_threads > 0)
{
int res= rli->parallel.do_event(serial_rgi, ev, event_size);
if (res >= 0)
DBUG_RETURN(res);
/*
Else we proceed to execute the event non-parallel.
This is the case for pre-10.0 events without GTID, and for handling
slave_skip_counter.
*/
}
if (typ == GTID_EVENT)
{
Gtid_log_event *gev= static_cast<Gtid_log_event *>(ev);
/*
For GTID, allocate a new sub_id for the given domain_id.
The sub_id must be allocated in increasing order of binlog order.
*/
if (event_group_new_gtid(serial_rgi, gev))
{
sql_print_error("Error reading relay log event: %s", "slave SQL thread "
"aborted because of out-of-memory error");
mysql_mutex_unlock(&rli->data_lock);
delete ev;
DBUG_RETURN(1);
}
if (opt_gtid_ignore_duplicates)
{
int res= rpl_global_gtid_slave_state.check_duplicate_gtid
(&serial_rgi->current_gtid, serial_rgi);
if (res < 0)
{
sql_print_error("Error processing GTID event: %s", "slave SQL "
"thread aborted because of out-of-memory error");
mysql_mutex_unlock(&rli->data_lock);
delete ev;
DBUG_RETURN(1);
}
/*
If we need to skip this event group (because the GTID was already
applied), then do it using the code for slave_skip_counter, which
is able to handle skipping until the end of the event group.
*/
if (!res)
rli->slave_skip_counter= 1;
}
}
serial_rgi->future_event_relay_log_pos= rli->future_event_relay_log_pos;
serial_rgi->event_relay_log_name= rli->event_relay_log_name;
serial_rgi->event_relay_log_pos= rli->event_relay_log_pos;
exec_res= apply_event_and_update_pos(ev, thd, serial_rgi, NULL);
delete_or_keep_event_post_apply(serial_rgi, typ, ev);
/*
update_log_pos failed: this should not happen, so we don't
retry.
*/
if (exec_res == 2)
DBUG_RETURN(1);
if (slave_trans_retries)
{
int temp_err;
LINT_INIT(temp_err);
if (exec_res && (temp_err= has_temporary_error(thd)))
{
const char *errmsg;
rli->clear_error();
/*
We were in a transaction which has been rolled back because of a
temporary error;
let's seek back to BEGIN log event and retry it all again.
Note, if lock wait timeout (innodb_lock_wait_timeout exceeded)
there is no rollback since 5.0.13 (ref: manual).
We have to not only seek but also
a) init_master_info(), to seek back to hot relay log's start
for later (for when we will come back to this hot log after
re-processing the possibly existing old logs where BEGIN is:
check_binlog_magic() will then need the cache to be at
position 0 (see comments at beginning of
init_master_info()).
b) init_relay_log_pos(), because the BEGIN may be an older relay log.
*/
if (serial_rgi->trans_retries < slave_trans_retries)
{
if (init_master_info(rli->mi, 0, 0, 0, SLAVE_SQL))
sql_print_error("Failed to initialize the master info structure");
else if (init_relay_log_pos(rli,
rli->group_relay_log_name,
rli->group_relay_log_pos,
1, &errmsg, 1))
sql_print_error("Error initializing relay log position: %s",
errmsg);
else
{
exec_res= 0;
serial_rgi->cleanup_context(thd, 1);
/* chance for concurrent connection to get more locks */
slave_sleep(thd, MY_MIN(serial_rgi->trans_retries,
MAX_SLAVE_RETRY_PAUSE),
sql_slave_killed, serial_rgi);
serial_rgi->trans_retries++;
mysql_mutex_lock(&rli->data_lock); // because of SHOW STATUS
rli->retried_trans++;
statistic_increment(slave_retried_transactions, LOCK_status);
mysql_mutex_unlock(&rli->data_lock);
DBUG_PRINT("info", ("Slave retries transaction "
"rgi->trans_retries: %lu",
serial_rgi->trans_retries));
}
}
else
sql_print_error("Slave SQL thread retried transaction %lu time(s) "
"in vain, giving up. Consider raising the value of "
"the slave_transaction_retries variable.",
slave_trans_retries);
}
else if ((exec_res && !temp_err) ||
(opt_using_transactions &&
rli->group_relay_log_pos == rli->event_relay_log_pos))
{
/*
Only reset the retry counter if the entire group succeeded
or failed with a non-transient error. On a successful
event, the execution will proceed as usual; in the case of a
non-transient error, the slave will stop with an error.
*/
serial_rgi->trans_retries= 0; // restart from fresh
DBUG_PRINT("info", ("Resetting retry counter, rgi->trans_retries: %lu",
serial_rgi->trans_retries));
}
}
thread_safe_increment64(&rli->executed_entries,
&slave_executed_entries_lock);
DBUG_RETURN(exec_res);
}
mysql_mutex_unlock(&rli->data_lock);
rli->report(ERROR_LEVEL, ER_SLAVE_RELAY_LOG_READ_FAILURE, NULL,
ER(ER_SLAVE_RELAY_LOG_READ_FAILURE), "\
Could not parse relay log event entry. The possible reasons are: the master's \
binary log is corrupted (you can check this by running 'mysqlbinlog' on the \
binary log), the slave's relay log is corrupted (you can check this by running \
'mysqlbinlog' on the relay log), a network problem, or a bug in the master's \
or slave's MySQL code. If you want to check the master's binary log or slave's \
relay log, you will be able to know their names by issuing 'SHOW SLAVE STATUS' \
on this slave.\
");
DBUG_RETURN(1);
}
static bool check_io_slave_killed(Master_info *mi, const char *info)
{
if (io_slave_killed(mi))
{
if (info && global_system_variables.log_warnings)
sql_print_information("%s", info);
return TRUE;
}
return FALSE;
}
/**
@brief Try to reconnect slave IO thread.
@details Terminates current connection to master, sleeps for
@c mi->connect_retry msecs and initiates new connection with
@c safe_reconnect(). Variable pointed by @c retry_count is increased -
if it exceeds @c master_retry_count then connection is not re-established
and function signals error.
Unless @c suppres_warnings is TRUE, a warning is put in the server error log
when reconnecting. The warning message and messages used to report errors
are taken from @c messages array. In case @c master_retry_count is exceeded,
no messages are added to the log.
@param[in] thd Thread context.
@param[in] mysql MySQL connection.
@param[in] mi Master connection information.
@param[in,out] retry_count Number of attempts to reconnect.
@param[in] suppress_warnings TRUE when a normal net read timeout
has caused to reconnecting.
@param[in] messages Messages to print/log, see
reconnect_messages[] array.
@retval 0 OK.
@retval 1 There was an error.
*/
static int try_to_reconnect(THD *thd, MYSQL *mysql, Master_info *mi,
uint *retry_count, bool suppress_warnings,
const char *messages[SLAVE_RECON_MSG_MAX])
{
mi->slave_running= MYSQL_SLAVE_RUN_NOT_CONNECT;
thd->proc_info= messages[SLAVE_RECON_MSG_WAIT];
#ifdef SIGNAL_WITH_VIO_CLOSE
thd->clear_active_vio();
#endif
end_server(mysql);
if ((*retry_count)++)
{
if (*retry_count > master_retry_count)
return 1; // Don't retry forever
slave_sleep(thd, mi->connect_retry, io_slave_killed, mi);
}
if (check_io_slave_killed(mi, messages[SLAVE_RECON_MSG_KILLED_WAITING]))
return 1;
thd->proc_info = messages[SLAVE_RECON_MSG_AFTER];
if (!suppress_warnings)
{
char buf[256], llbuff[22];
String tmp;
if (mi->using_gtid != Master_info::USE_GTID_NO)
{
tmp.append(STRING_WITH_LEN("; GTID position '"));
mi->gtid_current_pos.append_to_string(&tmp);
if (mi->events_queued_since_last_gtid == 0)
tmp.append(STRING_WITH_LEN("'"));
else
{
tmp.append(STRING_WITH_LEN("', GTID event skip "));
tmp.append_ulonglong((ulonglong)mi->events_queued_since_last_gtid);
}
}
my_snprintf(buf, sizeof(buf), messages[SLAVE_RECON_MSG_FAILED],
IO_RPL_LOG_NAME, llstr(mi->master_log_pos, llbuff),
tmp.c_ptr_safe());
/*
Raise a warining during registering on master/requesting dump.
Log a message reading event.
*/
if (messages[SLAVE_RECON_MSG_COMMAND][0])
{
mi->report(WARNING_LEVEL, ER_SLAVE_MASTER_COM_FAILURE, NULL,
ER(ER_SLAVE_MASTER_COM_FAILURE),
messages[SLAVE_RECON_MSG_COMMAND], buf);
}
else
{
sql_print_information("%s", buf);
}
}
if (safe_reconnect(thd, mysql, mi, 1) || io_slave_killed(mi))
{
if (global_system_variables.log_warnings)
sql_print_information("%s", messages[SLAVE_RECON_MSG_KILLED_AFTER]);
return 1;
}
return 0;
}
/**
Slave IO thread entry point.
@param arg Pointer to Master_info struct that holds information for
the IO thread.
@return Always 0.
*/
pthread_handler_t handle_slave_io(void *arg)
{
THD *thd; // needs to be first for thread_stack
MYSQL *mysql;
Master_info *mi = (Master_info*)arg;
Relay_log_info *rli= &mi->rli;
char llbuff[22];
uint retry_count;
bool suppress_warnings;
int ret;
rpl_io_thread_info io_info;
#ifndef DBUG_OFF
uint retry_count_reg= 0, retry_count_dump= 0, retry_count_event= 0;
#endif
// needs to call my_thread_init(), otherwise we get a coredump in DBUG_ stuff
my_thread_init();
DBUG_ENTER("handle_slave_io");
DBUG_ASSERT(mi->inited);
mysql= NULL ;
retry_count= 0;
thd= new THD; // note that contructor of THD uses DBUG_ !
mysql_mutex_lock(&mi->run_lock);
/* Inform waiting threads that slave has started */
mi->slave_run_id++;
#ifndef DBUG_OFF
mi->events_till_disconnect = disconnect_slave_event_count;
#endif
THD_CHECK_SENTRY(thd);
mi->io_thd = thd;
pthread_detach_this_thread();
thd->thread_stack= (char*) &thd; // remember where our stack is
mi->clear_error();
if (init_slave_thread(thd, mi, SLAVE_THD_IO))
{
mysql_cond_broadcast(&mi->start_cond);
sql_print_error("Failed during slave I/O thread initialization");
goto err_during_init;
}
thd->system_thread_info.rpl_io_info= &io_info;
mysql_mutex_lock(&LOCK_thread_count);
threads.append(thd);
mysql_mutex_unlock(&LOCK_thread_count);
mi->slave_running = MYSQL_SLAVE_RUN_NOT_CONNECT;
mi->abort_slave = 0;
mysql_mutex_unlock(&mi->run_lock);
mysql_cond_broadcast(&mi->start_cond);
DBUG_PRINT("master_info",("log_file_name: '%s' position: %s",
mi->master_log_name,
llstr(mi->master_log_pos,llbuff)));
/* This must be called before run any binlog_relay_io hooks */
my_pthread_setspecific_ptr(RPL_MASTER_INFO, mi);
/* Load the set of seen GTIDs, if we did not already. */
if (rpl_load_gtid_slave_state(thd))
{
mi->report(ERROR_LEVEL, thd->get_stmt_da()->sql_errno(), NULL,
"Unable to load replication GTID slave state from mysql.%s: %s",
rpl_gtid_slave_state_table_name.str,
thd->get_stmt_da()->message());
/*
If we are using old-style replication, we can continue, even though we
then will not be able to record the GTIDs we receive. But if using GTID,
we must give up.
*/
if (mi->using_gtid != Master_info::USE_GTID_NO || opt_gtid_strict_mode)
goto err;
}
if (RUN_HOOK(binlog_relay_io, thread_start, (thd, mi)))
{
mi->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR, NULL,
ER(ER_SLAVE_FATAL_ERROR), "Failed to run 'thread_start' hook");
goto err;
}
if (!(mi->mysql = mysql = mysql_init(NULL)))
{
mi->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR, NULL,
ER(ER_SLAVE_FATAL_ERROR), "error in mysql_init()");
goto err;
}
THD_STAGE_INFO(thd, stage_connecting_to_master);
// we can get killed during safe_connect
if (!safe_connect(thd, mysql, mi))
{
if (mi->using_gtid == Master_info::USE_GTID_NO)
sql_print_information("Slave I/O thread: connected to master '%s@%s:%d',"
"replication started in log '%s' at position %s",
mi->user, mi->host, mi->port,
IO_RPL_LOG_NAME,
llstr(mi->master_log_pos,llbuff));
else
{
String tmp;
mi->gtid_current_pos.to_string(&tmp);
sql_print_information("Slave I/O thread: connected to master '%s@%s:%d',"
"replication starts at GTID position '%s'",
mi->user, mi->host, mi->port, tmp.c_ptr_safe());
}
}
else
{
sql_print_information("Slave I/O thread killed while connecting to master");
goto err;
}
connected:
if (mi->using_gtid != Master_info::USE_GTID_NO)
{
/*
When the IO thread (re)connects to the master using GTID, it will
connect at the start of an event group. But the IO thread may have
previously logged part of the following event group to the relay
log.
When the IO and SQL thread are started together, we erase any previous
relay logs, but this is not possible/desirable while the SQL thread is
running. To avoid duplicating partial event groups in the relay logs in
this case, we remember the count of events in any partially logged event
group before the reconnect, and then here at connect we set up a counter
to skip the already-logged part of the group.
*/
mi->gtid_reconnect_event_skip_count= mi->events_queued_since_last_gtid;
mi->gtid_event_seen= false;
}
#ifdef ENABLED_DEBUG_SYNC
DBUG_EXECUTE_IF("dbug.before_get_running_status_yes",
{
const char act[]=
"now "
"wait_for signal.io_thread_let_running";
DBUG_ASSERT(debug_sync_service);
DBUG_ASSERT(!debug_sync_set_action(thd,
STRING_WITH_LEN(act)));
};);
#endif
// TODO: the assignment below should be under mutex (5.0)
mi->slave_running= MYSQL_SLAVE_RUN_CONNECT;
thd->slave_net = &mysql->net;
THD_STAGE_INFO(thd, stage_checking_master_version);
ret= get_master_version_and_clock(mysql, mi);
if (ret == 1)
/* Fatal error */
goto err;
if (ret == 2)
{
if (check_io_slave_killed(mi, "Slave I/O thread killed"
"while calling get_master_version_and_clock(...)"))
goto err;
suppress_warnings= FALSE;
/*
Try to reconnect because the error was caused by a transient network
problem
*/
if (try_to_reconnect(thd, mysql, mi, &retry_count, suppress_warnings,
reconnect_messages[SLAVE_RECON_ACT_REG]))
goto err;
goto connected;
}
if (mi->rli.relay_log.description_event_for_queue->binlog_version > 1)
{
/*
Register ourselves with the master.
*/
THD_STAGE_INFO(thd, stage_registering_slave_on_master);
if (register_slave_on_master(mysql, mi, &suppress_warnings))
{
if (!check_io_slave_killed(mi, "Slave I/O thread killed "
"while registering slave on master"))
{
sql_print_error("Slave I/O thread couldn't register on master");
if (try_to_reconnect(thd, mysql, mi, &retry_count, suppress_warnings,
reconnect_messages[SLAVE_RECON_ACT_REG]))
goto err;
}
else
goto err;
goto connected;
}
DBUG_EXECUTE_IF("FORCE_SLAVE_TO_RECONNECT_REG",
if (!retry_count_reg)
{
retry_count_reg++;
sql_print_information("Forcing to reconnect slave I/O thread");
if (try_to_reconnect(thd, mysql, mi, &retry_count, suppress_warnings,
reconnect_messages[SLAVE_RECON_ACT_REG]))
goto err;
goto connected;
});
}
DBUG_PRINT("info",("Starting reading binary log from master"));
while (!io_slave_killed(mi))
{
THD_STAGE_INFO(thd, stage_requesting_binlog_dump);
if (request_dump(thd, mysql, mi, &suppress_warnings))
{
sql_print_error("Failed on request_dump()");
if (check_io_slave_killed(mi, "Slave I/O thread killed while \
requesting master dump") ||
try_to_reconnect(thd, mysql, mi, &retry_count, suppress_warnings,
reconnect_messages[SLAVE_RECON_ACT_DUMP]))
goto err;
goto connected;
}
DBUG_EXECUTE_IF("FORCE_SLAVE_TO_RECONNECT_DUMP",
if (!retry_count_dump)
{
retry_count_dump++;
sql_print_information("Forcing to reconnect slave I/O thread");
if (try_to_reconnect(thd, mysql, mi, &retry_count, suppress_warnings,
reconnect_messages[SLAVE_RECON_ACT_DUMP]))
goto err;
goto connected;
});
const char *event_buf;
DBUG_ASSERT(mi->last_error().number == 0);
while (!io_slave_killed(mi))
{
ulong event_len;
/*
We say "waiting" because read_event() will wait if there's nothing to
read. But if there's something to read, it will not wait. The
important thing is to not confuse users by saying "reading" whereas
we're in fact receiving nothing.
*/
THD_STAGE_INFO(thd, stage_waiting_for_master_to_send_event);
event_len= read_event(mysql, mi, &suppress_warnings);
if (check_io_slave_killed(mi, "Slave I/O thread killed while \
reading event"))
goto err;
DBUG_EXECUTE_IF("FORCE_SLAVE_TO_RECONNECT_EVENT",
if (!retry_count_event)
{
retry_count_event++;
sql_print_information("Forcing to reconnect slave I/O thread");
if (try_to_reconnect(thd, mysql, mi, &retry_count, suppress_warnings,
reconnect_messages[SLAVE_RECON_ACT_EVENT]))
goto err;
goto connected;
});
if (event_len == packet_error)
{
uint mysql_error_number= mysql_errno(mysql);
switch (mysql_error_number) {
case CR_NET_PACKET_TOO_LARGE:
sql_print_error("\
Log entry on master is longer than slave_max_allowed_packet (%lu) on \
slave. If the entry is correct, restart the server with a higher value of \
slave_max_allowed_packet",
slave_max_allowed_packet);
mi->report(ERROR_LEVEL, ER_NET_PACKET_TOO_LARGE, NULL,
"%s", "Got a packet bigger than 'slave_max_allowed_packet' bytes");
goto err;
case ER_MASTER_FATAL_ERROR_READING_BINLOG:
mi->report(ERROR_LEVEL, ER_MASTER_FATAL_ERROR_READING_BINLOG, NULL,
ER(ER_MASTER_FATAL_ERROR_READING_BINLOG),
mysql_error_number, mysql_error(mysql));
goto err;
case ER_OUT_OF_RESOURCES:
sql_print_error("\
Stopping slave I/O thread due to out-of-memory error from master");
mi->report(ERROR_LEVEL, ER_OUT_OF_RESOURCES, NULL,
"%s", ER(ER_OUT_OF_RESOURCES));
goto err;
}
if (try_to_reconnect(thd, mysql, mi, &retry_count, suppress_warnings,
reconnect_messages[SLAVE_RECON_ACT_EVENT]))
goto err;
goto connected;
} // if (event_len == packet_error)
retry_count=0; // ok event, reset retry counter
THD_STAGE_INFO(thd, stage_queueing_master_event_to_the_relay_log);
event_buf= (const char*)mysql->net.read_pos + 1;
if (RUN_HOOK(binlog_relay_io, after_read_event,
(thd, mi,(const char*)mysql->net.read_pos + 1,
event_len, &event_buf, &event_len)))
{
mi->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR, NULL,
ER(ER_SLAVE_FATAL_ERROR),
"Failed to run 'after_read_event' hook");
goto err;
}
/* XXX: 'synced' should be updated by queue_event to indicate
whether event has been synced to disk */
bool synced= 0;
if (queue_event(mi, event_buf, event_len))
{
mi->report(ERROR_LEVEL, ER_SLAVE_RELAY_LOG_WRITE_FAILURE, NULL,
ER(ER_SLAVE_RELAY_LOG_WRITE_FAILURE),
"could not queue event from master");
goto err;
}
if (RUN_HOOK(binlog_relay_io, after_queue_event,
(thd, mi, event_buf, event_len, synced)))
{
mi->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR, NULL,
ER(ER_SLAVE_FATAL_ERROR),
"Failed to run 'after_queue_event' hook");
goto err;
}
if (mi->using_gtid == Master_info::USE_GTID_NO &&
flush_master_info(mi, TRUE, TRUE))
{
sql_print_error("Failed to flush master info file");
goto err;
}
/*
See if the relay logs take too much space.
We don't lock mi->rli.log_space_lock here; this dirty read saves time
and does not introduce any problem:
- if mi->rli.ignore_log_space_limit is 1 but becomes 0 just after (so
the clean value is 0), then we are reading only one more event as we
should, and we'll block only at the next event. No big deal.
- if mi->rli.ignore_log_space_limit is 0 but becomes 1 just
after (so the clean value is 1), then we are going into
wait_for_relay_log_space() for no reason, but this function
will do a clean read, notice the clean value and exit
immediately.
*/
#ifndef DBUG_OFF
{
char llbuf1[22], llbuf2[22];
DBUG_PRINT("info", ("log_space_limit=%s log_space_total=%s \
ignore_log_space_limit=%d",
llstr(rli->log_space_limit,llbuf1),
llstr(rli->log_space_total,llbuf2),
(int) rli->ignore_log_space_limit));
}
#endif
if (rli->log_space_limit && rli->log_space_limit <
rli->log_space_total &&
!rli->ignore_log_space_limit)
if (wait_for_relay_log_space(rli))
{
sql_print_error("Slave I/O thread aborted while waiting for relay \
log space");
goto err;
}
}
}
// error = 0;
err:
// print the current replication position
if (mi->using_gtid == Master_info::USE_GTID_NO)
sql_print_information("Slave I/O thread exiting, read up to log '%s', "
"position %s",
IO_RPL_LOG_NAME, llstr(mi->master_log_pos,llbuff));
else
{
String tmp;
mi->gtid_current_pos.to_string(&tmp);
sql_print_information("Slave I/O thread exiting, read up to log '%s', "
"position %s; GTID position %s",
IO_RPL_LOG_NAME, llstr(mi->master_log_pos,llbuff),
tmp.c_ptr_safe());
}
RUN_HOOK(binlog_relay_io, thread_stop, (thd, mi));
thd->reset_query();
thd->reset_db(NULL, 0);
if (mysql)
{
/*
Here we need to clear the active VIO before closing the
connection with the master. The reason is that THD::awake()
might be called from terminate_slave_thread() because somebody
issued a STOP SLAVE. If that happends, the close_active_vio()
can be called in the middle of closing the VIO associated with
the 'mysql' object, causing a crash.
*/
#ifdef SIGNAL_WITH_VIO_CLOSE
thd->clear_active_vio();
#endif
mysql_close(mysql);
mi->mysql=0;
}
write_ignored_events_info_to_relay_log(thd, mi);
if (mi->using_gtid != Master_info::USE_GTID_NO)
flush_master_info(mi, TRUE, TRUE);
THD_STAGE_INFO(thd, stage_waiting_for_slave_mutex_on_exit);
thd->add_status_to_global();
mysql_mutex_lock(&mi->run_lock);
err_during_init:
/* Forget the relay log's format */
delete mi->rli.relay_log.description_event_for_queue;
mi->rli.relay_log.description_event_for_queue= 0;
// TODO: make rpl_status part of Master_info
change_rpl_status(RPL_ACTIVE_SLAVE,RPL_IDLE_SLAVE);
mysql_mutex_lock(&LOCK_thread_count);
thd->unlink();
mysql_mutex_unlock(&LOCK_thread_count);
THD_CHECK_SENTRY(thd);
delete thd;
mi->abort_slave= 0;
mi->slave_running= MYSQL_SLAVE_NOT_RUN;
mi->io_thd= 0;
/*
Note: the order of the two following calls (first broadcast, then unlock)
is important. Otherwise a killer_thread can execute between the calls and
delete the mi structure leading to a crash! (see BUG#25306 for details)
*/
mysql_cond_broadcast(&mi->stop_cond); // tell the world we are done
DBUG_EXECUTE_IF("simulate_slave_delay_at_terminate_bug38694", sleep(5););
mysql_mutex_unlock(&mi->run_lock);
DBUG_LEAVE; // Must match DBUG_ENTER()
my_thread_end();
#ifdef HAVE_OPENSSL
ERR_remove_state(0);
#endif
pthread_exit(0);
return 0; // Avoid compiler warnings
}
/*
Check the temporary directory used by commands like
LOAD DATA INFILE.
As the directory never changes during a mysqld run, we only
test this once and cache the result. This also resolve a race condition
when this can be run by multiple threads at the same time.
*/
static bool check_temp_dir_run= 0;
static int check_temp_dir_result= 0;
static
int check_temp_dir(char* tmp_file)
{
File fd;
int result= 1; // Assume failure
MY_DIR *dirp;
char tmp_dir[FN_REFLEN];
size_t tmp_dir_size;
DBUG_ENTER("check_temp_dir");
mysql_mutex_lock(&LOCK_thread_count);
if (check_temp_dir_run)
{
result= check_temp_dir_result;
goto end;
}
check_temp_dir_run= 1;
/*
Get the directory from the temporary file.
*/
dirname_part(tmp_dir, tmp_file, &tmp_dir_size);
/*
Check if the directory exists.
*/
if (!(dirp=my_dir(tmp_dir,MYF(MY_WME))))
goto end;
my_dirend(dirp);
/*
Check permissions to create a file. We use O_TRUNC to ensure that
things works even if we happen to have and old file laying around.
*/
if ((fd= mysql_file_create(key_file_misc,
tmp_file, CREATE_MODE,
O_WRONLY | O_BINARY | O_TRUNC | O_NOFOLLOW,
MYF(MY_WME))) < 0)
goto end;
result= 0; // Directory name ok
/*
Clean up.
*/
mysql_file_close(fd, MYF(0));
mysql_file_delete(key_file_misc, tmp_file, MYF(0));
end:
check_temp_dir_result= result;
mysql_mutex_unlock(&LOCK_thread_count);
DBUG_RETURN(result);
}
void
slave_output_error_info(rpl_group_info *rgi, THD *thd)
{
/*
retrieve as much info as possible from the thd and, error
codes and warnings and print this to the error log as to
allow the user to locate the error
*/
Relay_log_info *rli= rgi->rli;
uint32 const last_errno= rli->last_error().number;
char llbuff[22];
if (thd->is_error())
{
char const *const errmsg= thd->get_stmt_da()->message();
DBUG_PRINT("info",
("thd->get_stmt_da()->sql_errno()=%d; rli->last_error.number=%d",
thd->get_stmt_da()->sql_errno(), last_errno));
if (last_errno == 0)
{
/*
This function is reporting an error which was not reported
while executing exec_relay_log_event().
*/
rli->report(ERROR_LEVEL, thd->get_stmt_da()->sql_errno(),
rgi->gtid_info(), "%s", errmsg);
}
else if (last_errno != thd->get_stmt_da()->sql_errno())
{
/*
* An error was reported while executing exec_relay_log_event()
* however the error code differs from what is in the thread.
* This function prints out more information to help finding
* what caused the problem.
*/
sql_print_error("Slave (additional info): %s Error_code: %d",
errmsg, thd->get_stmt_da()->sql_errno());
}
}
/* Print any warnings issued */
Diagnostics_area::Sql_condition_iterator it=
thd->get_stmt_da()->sql_conditions();
const Sql_condition *err;
/*
Added controlled slave thread cancel for replication
of user-defined variables.
*/
bool udf_error = false;
while ((err= it++))
{
if (err->get_sql_errno() == ER_CANT_OPEN_LIBRARY)
udf_error = true;
sql_print_warning("Slave: %s Error_code: %d", err->get_message_text(), err->get_sql_errno());
}
if (udf_error)
{
String tmp;
if (rli->mi->using_gtid != Master_info::USE_GTID_NO)
{
tmp.append(STRING_WITH_LEN("; GTID position '"));
rpl_append_gtid_state(&tmp, false);
tmp.append(STRING_WITH_LEN("'"));
}
sql_print_error("Error loading user-defined library, slave SQL "
"thread aborted. Install the missing library, and restart the "
"slave SQL thread with \"SLAVE START\". We stopped at log '%s' "
"position %s%s", RPL_LOG_NAME, llstr(rli->group_master_log_pos,
llbuff), tmp.c_ptr_safe());
}
else
{
String tmp;
if (rli->mi->using_gtid != Master_info::USE_GTID_NO)
{
tmp.append(STRING_WITH_LEN("; GTID position '"));
rpl_append_gtid_state(&tmp, false);
tmp.append(STRING_WITH_LEN("'"));
}
sql_print_error("\
Error running query, slave SQL thread aborted. Fix the problem, and restart \
the slave SQL thread with \"SLAVE START\". We stopped at log \
'%s' position %s%s", RPL_LOG_NAME, llstr(rli->group_master_log_pos, llbuff),
tmp.c_ptr_safe());
}
}
/**
Slave SQL thread entry point.
@param arg Pointer to Relay_log_info object that holds information
for the SQL thread.
@return Always 0.
*/
pthread_handler_t handle_slave_sql(void *arg)
{
THD *thd; /* needs to be first for thread_stack */
char llbuff[22],llbuff1[22];
char saved_log_name[FN_REFLEN];
char saved_master_log_name[FN_REFLEN];
my_off_t UNINIT_VAR(saved_log_pos);
my_off_t UNINIT_VAR(saved_master_log_pos);
String saved_skip_gtid_pos;
my_off_t saved_skip= 0;
Master_info *mi= ((Master_info*)arg);
Relay_log_info* rli = &mi->rli;
const char *errmsg;
rpl_group_info *serial_rgi;
rpl_sql_thread_info sql_info(mi->rpl_filter);
// needs to call my_thread_init(), otherwise we get a coredump in DBUG_ stuff
my_thread_init();
DBUG_ENTER("handle_slave_sql");
LINT_INIT(saved_master_log_pos);
LINT_INIT(saved_log_pos);
serial_rgi= new rpl_group_info(rli);
thd = new THD; // note that contructor of THD uses DBUG_ !
thd->thread_stack = (char*)&thd; // remember where our stack is
thd->system_thread_info.rpl_sql_info= &sql_info;
DBUG_ASSERT(rli->inited);
DBUG_ASSERT(rli->mi == mi);
mysql_mutex_lock(&rli->run_lock);
DBUG_ASSERT(!rli->slave_running);
errmsg= 0;
#ifndef DBUG_OFF
rli->events_till_abort = abort_slave_event_count;
#endif
/*
THD for the sql driver thd. In parallel replication this is the thread
that reads things from the relay log and calls rpl_parallel::do_event()
to execute queries.
In single thread replication this is the THD for the thread that is
executing SQL queries too.
*/
serial_rgi->thd= rli->sql_driver_thd= thd;
/* Inform waiting threads that slave has started */
rli->slave_run_id++;
rli->slave_running= MYSQL_SLAVE_RUN_NOT_CONNECT;
pthread_detach_this_thread();
if (init_slave_thread(thd, mi, SLAVE_THD_SQL))
{
/*
TODO: this is currently broken - slave start and change master
will be stuck if we fail here
*/
mysql_cond_broadcast(&rli->start_cond);
rli->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR, NULL,
"Failed during slave thread initialization");
goto err_during_init;
}
thd->init_for_queries();
thd->rgi_slave= serial_rgi;
if ((serial_rgi->deferred_events_collecting= mi->rpl_filter->is_on()))
{
serial_rgi->deferred_events= new Deferred_log_events(rli);
}
/*
binlog_annotate_row_events must be TRUE only after an Annotate_rows event
has been received and only till the last corresponding rbr event has been
applied. In all other cases it must be FALSE.
*/
thd->variables.binlog_annotate_row_events= 0;
mysql_mutex_lock(&LOCK_thread_count);
threads.append(thd);
mysql_mutex_unlock(&LOCK_thread_count);
/*
We are going to set slave_running to 1. Assuming slave I/O thread is
alive and connected, this is going to make Seconds_Behind_Master be 0
i.e. "caught up". Even if we're just at start of thread. Well it's ok, at
the moment we start we can think we are caught up, and the next second we
start receiving data so we realize we are not caught up and
Seconds_Behind_Master grows. No big deal.
*/
rli->abort_slave = 0;
rli->stop_for_until= false;
mysql_mutex_unlock(&rli->run_lock);
mysql_cond_broadcast(&rli->start_cond);
/*
Reset errors for a clean start (otherwise, if the master is idle, the SQL
thread may execute no Query_log_event, so the error will remain even
though there's no problem anymore). Do not reset the master timestamp
(imagine the slave has caught everything, the STOP SLAVE and START SLAVE:
as we are not sure that we are going to receive a query, we want to
remember the last master timestamp (to say how many seconds behind we are
now.
But the master timestamp is reset by RESET SLAVE & CHANGE MASTER.
*/
rli->clear_error();
rli->parallel.reset();
//tell the I/O thread to take relay_log_space_limit into account from now on
mysql_mutex_lock(&rli->log_space_lock);
rli->ignore_log_space_limit= 0;
mysql_mutex_unlock(&rli->log_space_lock);
serial_rgi->gtid_sub_id= 0;
serial_rgi->gtid_pending= false;
if (init_relay_log_pos(rli,
rli->group_relay_log_name,
rli->group_relay_log_pos,
1 /*need data lock*/, &errmsg,
1 /*look for a description_event*/))
{
rli->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR, NULL,
"Error initializing relay log position: %s", errmsg);
goto err;
}
if (rli->alloc_inuse_relaylog(rli->group_relay_log_name))
goto err;
strcpy(rli->future_event_master_log_name, rli->group_master_log_name);
THD_CHECK_SENTRY(thd);
#ifndef DBUG_OFF
{
char llbuf1[22], llbuf2[22];
DBUG_PRINT("info", ("my_b_tell(rli->cur_log)=%s rli->event_relay_log_pos=%s",
llstr(my_b_tell(rli->cur_log),llbuf1),
llstr(rli->event_relay_log_pos,llbuf2)));
DBUG_ASSERT(rli->event_relay_log_pos >= BIN_LOG_HEADER_SIZE);
/*
Wonder if this is correct. I (Guilhem) wonder if my_b_tell() returns the
correct position when it's called just after my_b_seek() (the questionable
stuff is those "seek is done on next read" comments in the my_b_seek()
source code).
The crude reality is that this assertion randomly fails whereas
replication seems to work fine. And there is no easy explanation why it
fails (as we my_b_seek(rli->event_relay_log_pos) at the very end of
init_relay_log_pos() called above). Maybe the assertion would be
meaningful if we held rli->data_lock between the my_b_seek() and the
DBUG_ASSERT().
*/
#ifdef SHOULD_BE_CHECKED
DBUG_ASSERT(my_b_tell(rli->cur_log) == rli->event_relay_log_pos);
#endif
}
#endif
DBUG_PRINT("master_info",("log_file_name: %s position: %s",
rli->group_master_log_name,
llstr(rli->group_master_log_pos,llbuff)));
if (global_system_variables.log_warnings)
{
String tmp;
if (mi->using_gtid != Master_info::USE_GTID_NO)
{
tmp.append(STRING_WITH_LEN("; GTID position '"));
rpl_append_gtid_state(&tmp,
mi->using_gtid==Master_info::USE_GTID_CURRENT_POS);
tmp.append(STRING_WITH_LEN("'"));
}
sql_print_information("Slave SQL thread initialized, starting replication in \
log '%s' at position %s, relay log '%s' position: %s%s", RPL_LOG_NAME,
llstr(rli->group_master_log_pos,llbuff),rli->group_relay_log_name,
llstr(rli->group_relay_log_pos,llbuff1), tmp.c_ptr_safe());
}
if (check_temp_dir(rli->slave_patternload_file))
{
rli->report(ERROR_LEVEL, thd->get_stmt_da()->sql_errno(), NULL,
"Unable to use slave's temporary directory %s - %s",
slave_load_tmpdir, thd->get_stmt_da()->message());
goto err;
}
/* Load the set of seen GTIDs, if we did not already. */
if (rpl_load_gtid_slave_state(thd))
{
rli->report(ERROR_LEVEL, thd->get_stmt_da()->sql_errno(), NULL,
"Unable to load replication GTID slave state from mysql.%s: %s",
rpl_gtid_slave_state_table_name.str,
thd->get_stmt_da()->message());
/*
If we are using old-style replication, we can continue, even though we
then will not be able to record the GTIDs we receive. But if using GTID,
we must give up.
*/
if (mi->using_gtid != Master_info::USE_GTID_NO || opt_gtid_strict_mode)
goto err;
}
/* execute init_slave variable */
if (opt_init_slave.length)
{
execute_init_command(thd, &opt_init_slave, &LOCK_sys_init_slave);
if (thd->is_slave_error)
{
rli->report(ERROR_LEVEL, thd->get_stmt_da()->sql_errno(), NULL,
"Slave SQL thread aborted. Can't execute init_slave query");
goto err;
}
}
/*
First check until condition - probably there is nothing to execute. We
do not want to wait for next event in this case.
*/
mysql_mutex_lock(&rli->data_lock);
if (rli->slave_skip_counter)
{
strmake_buf(saved_log_name, rli->group_relay_log_name);
strmake_buf(saved_master_log_name, rli->group_master_log_name);
saved_log_pos= rli->group_relay_log_pos;
saved_master_log_pos= rli->group_master_log_pos;
if (mi->using_gtid != Master_info::USE_GTID_NO)
{
saved_skip_gtid_pos.append(STRING_WITH_LEN(", GTID '"));
rpl_append_gtid_state(&saved_skip_gtid_pos, false);
saved_skip_gtid_pos.append(STRING_WITH_LEN("'; "));
}
saved_skip= rli->slave_skip_counter;
}
if ((rli->until_condition == Relay_log_info::UNTIL_MASTER_POS ||
rli->until_condition == Relay_log_info::UNTIL_RELAY_POS) &&
rli->is_until_satisfied(thd, NULL))
{
char buf[22];
sql_print_information("Slave SQL thread stopped because it reached its"
" UNTIL position %s", llstr(rli->until_pos(), buf));
mysql_mutex_unlock(&rli->data_lock);
goto err;
}
mysql_mutex_unlock(&rli->data_lock);
/* Read queries from the IO/THREAD until this thread is killed */
while (!sql_slave_killed(serial_rgi))
{
THD_STAGE_INFO(thd, stage_reading_event_from_the_relay_log);
THD_CHECK_SENTRY(thd);
if (saved_skip && rli->slave_skip_counter == 0)
{
String tmp;
if (mi->using_gtid != Master_info::USE_GTID_NO)
{
tmp.append(STRING_WITH_LEN(", GTID '"));
rpl_append_gtid_state(&tmp, false);
tmp.append(STRING_WITH_LEN("'; "));
}
sql_print_information("'SQL_SLAVE_SKIP_COUNTER=%ld' executed at "
"relay_log_file='%s', relay_log_pos='%ld', master_log_name='%s', "
"master_log_pos='%ld'%s and new position at "
"relay_log_file='%s', relay_log_pos='%ld', master_log_name='%s', "
"master_log_pos='%ld'%s ",
(ulong) saved_skip, saved_log_name, (ulong) saved_log_pos,
saved_master_log_name, (ulong) saved_master_log_pos,
saved_skip_gtid_pos.c_ptr_safe(),
rli->group_relay_log_name, (ulong) rli->group_relay_log_pos,
rli->group_master_log_name, (ulong) rli->group_master_log_pos,
tmp.c_ptr_safe());
saved_skip= 0;
saved_skip_gtid_pos.free();
}
if (exec_relay_log_event(thd, rli, serial_rgi))
{
DBUG_PRINT("info", ("exec_relay_log_event() failed"));
// do not scare the user if SQL thread was simply killed or stopped
if (!sql_slave_killed(serial_rgi))
slave_output_error_info(serial_rgi, thd);
goto err;
}
}
if (opt_slave_parallel_threads > 0)
rli->parallel.wait_for_done(thd, rli);
/* Thread stopped. Print the current replication position to the log */
{
String tmp;
if (mi->using_gtid != Master_info::USE_GTID_NO)
{
tmp.append(STRING_WITH_LEN("; GTID position '"));
rpl_append_gtid_state(&tmp, false);
tmp.append(STRING_WITH_LEN("'"));
}
sql_print_information("Slave SQL thread exiting, replication stopped in "
"log '%s' at position %s%s",
RPL_LOG_NAME,
llstr(rli->group_master_log_pos,llbuff),
tmp.c_ptr_safe());
}
err:
/*
Once again, in case we aborted with an error and skipped the first one.
(We want the first one to be before the printout of stop position to
get the correct position printed.)
*/
if (opt_slave_parallel_threads > 0)
rli->parallel.wait_for_done(thd, rli);
/*
Some events set some playgrounds, which won't be cleared because thread
stops. Stopping of this thread may not be known to these events ("stop"
request is detected only by the present function, not by events), so we
must "proactively" clear playgrounds:
*/
thd->clear_error();
serial_rgi->cleanup_context(thd, 1);
/*
Some extra safety, which should not been needed (normally, event deletion
should already have done these assignments (each event which sets these
variables is supposed to set them to 0 before terminating)).
*/
thd->catalog= 0;
thd->reset_query();
thd->reset_db(NULL, 0);
if (rli->mi->using_gtid != Master_info::USE_GTID_NO)
flush_relay_log_info(rli);
THD_STAGE_INFO(thd, stage_waiting_for_slave_mutex_on_exit);
thd->add_status_to_global();
mysql_mutex_lock(&rli->run_lock);
err_during_init:
/* We need data_lock, at least to wake up any waiting master_pos_wait() */
mysql_mutex_lock(&rli->data_lock);
DBUG_ASSERT(rli->slave_running == MYSQL_SLAVE_RUN_NOT_CONNECT); // tracking buffer overrun
/* When master_pos_wait() wakes up it will check this and terminate */
rli->slave_running= MYSQL_SLAVE_NOT_RUN;
/* Forget the relay log's format */
delete rli->relay_log.description_event_for_exec;
rli->relay_log.description_event_for_exec= 0;
/* Wake up master_pos_wait() */
mysql_mutex_unlock(&rli->data_lock);
DBUG_PRINT("info",("Signaling possibly waiting master_pos_wait() functions"));
mysql_cond_broadcast(&rli->data_cond);
rli->ignore_log_space_limit= 0; /* don't need any lock */
/* we die so won't remember charset - re-update them on next thread start */
thd->system_thread_info.rpl_sql_info->cached_charset_invalidate();
/*
TODO: see if we can do this conditionally in next_event() instead
to avoid unneeded position re-init
*/
thd->temporary_tables = 0; // remove tempation from destructor to close them
THD_CHECK_SENTRY(thd);
serial_rgi->thd= rli->sql_driver_thd= 0;
mysql_mutex_lock(&LOCK_thread_count);
THD_CHECK_SENTRY(thd);
thd->rgi_fake= thd->rgi_slave= NULL;
delete serial_rgi;
delete thd;
mysql_mutex_unlock(&LOCK_thread_count);
/*
Note: the order of the broadcast and unlock calls below (first broadcast, then unlock)
is important. Otherwise a killer_thread can execute between the calls and
delete the mi structure leading to a crash! (see BUG#25306 for details)
*/
mysql_cond_broadcast(&rli->stop_cond);
DBUG_EXECUTE_IF("simulate_slave_delay_at_terminate_bug38694", sleep(5););
mysql_mutex_unlock(&rli->run_lock); // tell the world we are done
DBUG_LEAVE; // Must match DBUG_ENTER()
my_thread_end();
#ifdef HAVE_OPENSSL
ERR_remove_state(0);
#endif
pthread_exit(0);
return 0; // Avoid compiler warnings
}
/*
process_io_create_file()
*/
static int process_io_create_file(Master_info* mi, Create_file_log_event* cev)
{
int error = 1;
ulong num_bytes;
bool cev_not_written;
THD *thd = mi->io_thd;
NET *net = &mi->mysql->net;
DBUG_ENTER("process_io_create_file");
if (unlikely(!cev->is_valid()))
DBUG_RETURN(1);
if (!mi->rpl_filter->db_ok(cev->db))
{
skip_load_data_infile(net);
DBUG_RETURN(0);
}
DBUG_ASSERT(cev->inited_from_old);
thd->file_id = cev->file_id = mi->file_id++;
thd->variables.server_id = cev->server_id;
cev_not_written = 1;
if (unlikely(net_request_file(net,cev->fname)))
{
sql_print_error("Slave I/O: failed requesting download of '%s'",
cev->fname);
goto err;
}
/*
This dummy block is so we could instantiate Append_block_log_event
once and then modify it slightly instead of doing it multiple times
in the loop
*/
{
Append_block_log_event aev(thd,0,0,0,0);
for (;;)
{
if (unlikely((num_bytes=my_net_read(net)) == packet_error))
{
sql_print_error("Network read error downloading '%s' from master",
cev->fname);
goto err;
}
if (unlikely(!num_bytes)) /* eof */
{
/* 3.23 master wants it */
net_write_command(net, 0, (uchar*) "", 0, (uchar*) "", 0);
/*
If we wrote Create_file_log_event, then we need to write
Execute_load_log_event. If we did not write Create_file_log_event,
then this is an empty file and we can just do as if the LOAD DATA
INFILE had not existed, i.e. write nothing.
*/
if (unlikely(cev_not_written))
break;
Execute_load_log_event xev(thd,0,0);
xev.log_pos = cev->log_pos;
if (unlikely(mi->rli.relay_log.append(&xev)))
{
mi->report(ERROR_LEVEL, ER_SLAVE_RELAY_LOG_WRITE_FAILURE, NULL,
ER(ER_SLAVE_RELAY_LOG_WRITE_FAILURE),
"error writing Exec_load event to relay log");
goto err;
}
mi->rli.relay_log.harvest_bytes_written(&mi->rli.log_space_total);
break;
}
if (unlikely(cev_not_written))
{
cev->block = net->read_pos;
cev->block_len = num_bytes;
if (unlikely(mi->rli.relay_log.append(cev)))
{
mi->report(ERROR_LEVEL, ER_SLAVE_RELAY_LOG_WRITE_FAILURE, NULL,
ER(ER_SLAVE_RELAY_LOG_WRITE_FAILURE),
"error writing Create_file event to relay log");
goto err;
}
cev_not_written=0;
mi->rli.relay_log.harvest_bytes_written(&mi->rli.log_space_total);
}
else
{
aev.block = net->read_pos;
aev.block_len = num_bytes;
aev.log_pos = cev->log_pos;
if (unlikely(mi->rli.relay_log.append(&aev)))
{
mi->report(ERROR_LEVEL, ER_SLAVE_RELAY_LOG_WRITE_FAILURE, NULL,
ER(ER_SLAVE_RELAY_LOG_WRITE_FAILURE),
"error writing Append_block event to relay log");
goto err;
}
mi->rli.relay_log.harvest_bytes_written(&mi->rli.log_space_total) ;
}
}
}
error=0;
err:
DBUG_RETURN(error);
}
/*
Start using a new binary log on the master
SYNOPSIS
process_io_rotate()
mi master_info for the slave
rev The rotate log event read from the binary log
DESCRIPTION
Updates the master info with the place in the next binary
log where we should start reading.
Rotate the relay log to avoid mixed-format relay logs.
NOTES
We assume we already locked mi->data_lock
RETURN VALUES
0 ok
1 Log event is illegal
*/
static int process_io_rotate(Master_info *mi, Rotate_log_event *rev)
{
DBUG_ENTER("process_io_rotate");
mysql_mutex_assert_owner(&mi->data_lock);
if (unlikely(!rev->is_valid()))
DBUG_RETURN(1);
/* Safe copy as 'rev' has been "sanitized" in Rotate_log_event's ctor */
memcpy(mi->master_log_name, rev->new_log_ident, rev->ident_len+1);
mi->master_log_pos= rev->pos;
DBUG_PRINT("info", ("master_log_pos: '%s' %lu",
mi->master_log_name, (ulong) mi->master_log_pos));
#ifndef DBUG_OFF
/*
If we do not do this, we will be getting the first
rotate event forever, so we need to not disconnect after one.
*/
if (disconnect_slave_event_count)
mi->events_till_disconnect++;
#endif
/*
If description_event_for_queue is format <4, there is conversion in the
relay log to the slave's format (4). And Rotate can mean upgrade or
nothing. If upgrade, it's to 5.0 or newer, so we will get a Format_desc, so
no need to reset description_event_for_queue now. And if it's nothing (same
master version as before), no need (still using the slave's format).
*/
if (mi->rli.relay_log.description_event_for_queue->binlog_version >= 4)
{
DBUG_ASSERT(mi->rli.relay_log.description_event_for_queue->checksum_alg ==
mi->rli.relay_log.relay_log_checksum_alg);
delete mi->rli.relay_log.description_event_for_queue;
/* start from format 3 (MySQL 4.0) again */
mi->rli.relay_log.description_event_for_queue= new
Format_description_log_event(3);
mi->rli.relay_log.description_event_for_queue->checksum_alg=
mi->rli.relay_log.relay_log_checksum_alg;
}
/*
Rotate the relay log makes binlog format detection easier (at next slave
start or mysqlbinlog)
*/
DBUG_RETURN(rotate_relay_log(mi) /* will take the right mutexes */);
}
/*
Reads a 3.23 event and converts it to the slave's format. This code was
copied from MySQL 4.0.
*/
static int queue_binlog_ver_1_event(Master_info *mi, const char *buf,
ulong event_len)
{
const char *errmsg = 0;
ulong inc_pos;
bool ignore_event= 0;
char *tmp_buf = 0;
Relay_log_info *rli= &mi->rli;
DBUG_ENTER("queue_binlog_ver_1_event");
/*
If we get Load event, we need to pass a non-reusable buffer
to read_log_event, so we do a trick
*/
if ((uchar)buf[EVENT_TYPE_OFFSET] == LOAD_EVENT)
{
if (unlikely(!(tmp_buf=(char*)my_malloc(event_len+1,MYF(MY_WME)))))
{
mi->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR, NULL,
ER(ER_SLAVE_FATAL_ERROR), "Memory allocation failed");
DBUG_RETURN(1);
}
memcpy(tmp_buf,buf,event_len);
/*
Create_file constructor wants a 0 as last char of buffer, this 0 will
serve as the string-termination char for the file's name (which is at the
end of the buffer)
We must increment event_len, otherwise the event constructor will not see
this end 0, which leads to segfault.
*/
tmp_buf[event_len++]=0;
int4store(tmp_buf+EVENT_LEN_OFFSET, event_len);
buf = (const char*)tmp_buf;
}
/*
This will transform LOAD_EVENT into CREATE_FILE_EVENT, ask the master to
send the loaded file, and write it to the relay log in the form of
Append_block/Exec_load (the SQL thread needs the data, as that thread is not
connected to the master).
*/
Log_event *ev=
Log_event::read_log_event(buf, event_len, &errmsg,
mi->rli.relay_log.description_event_for_queue, 0);
if (unlikely(!ev))
{
sql_print_error("Read invalid event from master: '%s',\
master could be corrupt but a more likely cause of this is a bug",
errmsg);
my_free(tmp_buf);
DBUG_RETURN(1);
}
mysql_mutex_lock(&mi->data_lock);
ev->log_pos= mi->master_log_pos; /* 3.23 events don't contain log_pos */
switch (ev->get_type_code()) {
case STOP_EVENT:
ignore_event= 1;
inc_pos= event_len;
break;
case ROTATE_EVENT:
if (unlikely(process_io_rotate(mi,(Rotate_log_event*)ev)))
{
delete ev;
mysql_mutex_unlock(&mi->data_lock);
DBUG_RETURN(1);
}
inc_pos= 0;
break;
case CREATE_FILE_EVENT:
/*
Yes it's possible to have CREATE_FILE_EVENT here, even if we're in
queue_old_event() which is for 3.23 events which don't comprise
CREATE_FILE_EVENT. This is because read_log_event() above has just
transformed LOAD_EVENT into CREATE_FILE_EVENT.
*/
{
/* We come here when and only when tmp_buf != 0 */
DBUG_ASSERT(tmp_buf != 0);
inc_pos=event_len;
ev->log_pos+= inc_pos;
int error = process_io_create_file(mi,(Create_file_log_event*)ev);
delete ev;
mi->master_log_pos += inc_pos;
DBUG_PRINT("info", ("master_log_pos: %lu", (ulong) mi->master_log_pos));
mysql_mutex_unlock(&mi->data_lock);
my_free(tmp_buf);
DBUG_RETURN(error);
}
default:
inc_pos= event_len;
break;
}
if (likely(!ignore_event))
{
if (ev->log_pos)
/*
Don't do it for fake Rotate events (see comment in
Log_event::Log_event(const char* buf...) in log_event.cc).
*/
ev->log_pos+= event_len; /* make log_pos be the pos of the end of the event */
if (unlikely(rli->relay_log.append(ev)))
{
delete ev;
mysql_mutex_unlock(&mi->data_lock);
DBUG_RETURN(1);
}
rli->relay_log.harvest_bytes_written(&rli->log_space_total);
}
delete ev;
mi->master_log_pos+= inc_pos;
DBUG_PRINT("info", ("master_log_pos: %lu", (ulong) mi->master_log_pos));
mysql_mutex_unlock(&mi->data_lock);
DBUG_RETURN(0);
}
/*
Reads a 4.0 event and converts it to the slave's format. This code was copied
from queue_binlog_ver_1_event(), with some affordable simplifications.
*/
static int queue_binlog_ver_3_event(Master_info *mi, const char *buf,
ulong event_len)
{
const char *errmsg = 0;
ulong inc_pos;
char *tmp_buf = 0;
Relay_log_info *rli= &mi->rli;
DBUG_ENTER("queue_binlog_ver_3_event");
/* read_log_event() will adjust log_pos to be end_log_pos */
Log_event *ev=
Log_event::read_log_event(buf,event_len, &errmsg,
mi->rli.relay_log.description_event_for_queue, 0);
if (unlikely(!ev))
{
sql_print_error("Read invalid event from master: '%s',\
master could be corrupt but a more likely cause of this is a bug",
errmsg);
my_free(tmp_buf);
DBUG_RETURN(1);
}
mysql_mutex_lock(&mi->data_lock);
switch (ev->get_type_code()) {
case STOP_EVENT:
goto err;
case ROTATE_EVENT:
if (unlikely(process_io_rotate(mi,(Rotate_log_event*)ev)))
{
delete ev;
mysql_mutex_unlock(&mi->data_lock);
DBUG_RETURN(1);
}
inc_pos= 0;
break;
default:
inc_pos= event_len;
break;
}
if (unlikely(rli->relay_log.append(ev)))
{
delete ev;
mysql_mutex_unlock(&mi->data_lock);
DBUG_RETURN(1);
}
rli->relay_log.harvest_bytes_written(&rli->log_space_total);
delete ev;
mi->master_log_pos+= inc_pos;
err:
DBUG_PRINT("info", ("master_log_pos: %lu", (ulong) mi->master_log_pos));
mysql_mutex_unlock(&mi->data_lock);
DBUG_RETURN(0);
}
/*
queue_old_event()
Writes a 3.23 or 4.0 event to the relay log, after converting it to the 5.0
(exactly, slave's) format. To do the conversion, we create a 5.0 event from
the 3.23/4.0 bytes, then write this event to the relay log.
TODO:
Test this code before release - it has to be tested on a separate
setup with 3.23 master or 4.0 master
*/
static int queue_old_event(Master_info *mi, const char *buf,
ulong event_len)
{
DBUG_ENTER("queue_old_event");
switch (mi->rli.relay_log.description_event_for_queue->binlog_version)
{
case 1:
DBUG_RETURN(queue_binlog_ver_1_event(mi,buf,event_len));
case 3:
DBUG_RETURN(queue_binlog_ver_3_event(mi,buf,event_len));
default: /* unsupported format; eg version 2 */
DBUG_PRINT("info",("unsupported binlog format %d in queue_old_event()",
mi->rli.relay_log.description_event_for_queue->binlog_version));
DBUG_RETURN(1);
}
}
/*
queue_event()
If the event is 3.23/4.0, passes it to queue_old_event() which will convert
it. Otherwise, writes a 5.0 (or newer) event to the relay log. Then there is
no format conversion, it's pure read/write of bytes.
So a 5.0.0 slave's relay log can contain events in the slave's format or in
any >=5.0.0 format.
*/
static int queue_event(Master_info* mi,const char* buf, ulong event_len)
{
int error= 0;
String error_msg;
ulonglong inc_pos;
ulonglong event_pos;
Relay_log_info *rli= &mi->rli;
mysql_mutex_t *log_lock= rli->relay_log.get_log_lock();
ulong s_id;
bool unlock_data_lock= TRUE;
bool gtid_skip_enqueue= false;
bool got_gtid_event= false;
rpl_gtid event_gtid;
/*
FD_q must have been prepared for the first R_a event
inside get_master_version_and_clock()
Show-up of FD:s affects checksum_alg at once because
that changes FD_queue.
*/
uint8 checksum_alg= mi->checksum_alg_before_fd != BINLOG_CHECKSUM_ALG_UNDEF ?
mi->checksum_alg_before_fd :
mi->rli.relay_log.relay_log_checksum_alg;
char *save_buf= NULL; // needed for checksumming the fake Rotate event
char rot_buf[LOG_EVENT_HEADER_LEN + ROTATE_HEADER_LEN + FN_REFLEN];
DBUG_ASSERT(checksum_alg == BINLOG_CHECKSUM_ALG_OFF ||
checksum_alg == BINLOG_CHECKSUM_ALG_UNDEF ||
checksum_alg == BINLOG_CHECKSUM_ALG_CRC32);
DBUG_ENTER("queue_event");
/*
FD_queue checksum alg description does not apply in a case of
FD itself. The one carries both parts of the checksum data.
*/
if (buf[EVENT_TYPE_OFFSET] == FORMAT_DESCRIPTION_EVENT)
{
checksum_alg= get_checksum_alg(buf, event_len);
}
else if (buf[EVENT_TYPE_OFFSET] == START_EVENT_V3)
{
// checksum behaviour is similar to the pre-checksum FD handling
mi->checksum_alg_before_fd= BINLOG_CHECKSUM_ALG_UNDEF;
mi->rli.relay_log.description_event_for_queue->checksum_alg=
mi->rli.relay_log.relay_log_checksum_alg= checksum_alg=
BINLOG_CHECKSUM_ALG_OFF;
}
// does not hold always because of old binlog can work with NM
// DBUG_ASSERT(checksum_alg != BINLOG_CHECKSUM_ALG_UNDEF);
// should hold unless manipulations with RL. Tests that do that
// will have to refine the clause.
DBUG_ASSERT(mi->rli.relay_log.relay_log_checksum_alg !=
BINLOG_CHECKSUM_ALG_UNDEF);
// Emulate the network corruption
DBUG_EXECUTE_IF("corrupt_queue_event",
if (buf[EVENT_TYPE_OFFSET] != FORMAT_DESCRIPTION_EVENT)
{
char *debug_event_buf_c = (char*) buf;
int debug_cor_pos = rand() % (event_len - BINLOG_CHECKSUM_LEN);
debug_event_buf_c[debug_cor_pos] =~ debug_event_buf_c[debug_cor_pos];
DBUG_PRINT("info", ("Corrupt the event at queue_event: byte on position %d", debug_cor_pos));
DBUG_SET("-d,corrupt_queue_event");
}
);
if (event_checksum_test((uchar *) buf, event_len, checksum_alg))
{
error= ER_NETWORK_READ_EVENT_CHECKSUM_FAILURE;
unlock_data_lock= FALSE;
goto err;
}
if (mi->rli.relay_log.description_event_for_queue->binlog_version<4 &&
(uchar)buf[EVENT_TYPE_OFFSET] != FORMAT_DESCRIPTION_EVENT /* a way to escape */)
DBUG_RETURN(queue_old_event(mi,buf,event_len));
mysql_mutex_lock(&mi->data_lock);
switch ((uchar)buf[EVENT_TYPE_OFFSET]) {
case STOP_EVENT:
/*
We needn't write this event to the relay log. Indeed, it just indicates a
master server shutdown. The only thing this does is cleaning. But
cleaning is already done on a per-master-thread basis (as the master
server is shutting down cleanly, it has written all DROP TEMPORARY TABLE
prepared statements' deletion are TODO only when we binlog prep stmts).
We don't even increment mi->master_log_pos, because we may be just after
a Rotate event. Btw, in a few milliseconds we are going to have a Start
event from the next binlog (unless the master is presently running
without --log-bin).
*/
goto err;
case ROTATE_EVENT:
{
Rotate_log_event rev(buf, checksum_alg != BINLOG_CHECKSUM_ALG_OFF ?
event_len - BINLOG_CHECKSUM_LEN : event_len,
mi->rli.relay_log.description_event_for_queue);
if (unlikely(mi->gtid_reconnect_event_skip_count) &&
unlikely(!mi->gtid_event_seen) &&
rev.is_artificial_event() &&
(mi->prev_master_id != mi->master_id ||
strcmp(rev.new_log_ident, mi->master_log_name) != 0))
{
/*
Artificial Rotate_log_event is the first event we receive at the start
of each master binlog file. It gives the name of the new binlog file.
Normally, we already have this name from the real rotate event at the
end of the previous binlog file (unless we are making a new connection
using GTID). But if the master server restarted/crashed, there is no
rotate event at the end of the prior binlog file, so the name is new.
We use this fact to handle a special case of master crashing. If the
master crashed while writing the binlog, it might end with a partial
event group lacking the COMMIT/XID event, which must be rolled
back. If the slave IO thread happens to get a disconnect in the middle
of exactly this event group, it will try to reconnect at the same GTID
and skip already fetched events. However, that GTID did not commit on
the master before the crash, so it does not really exist, and the
master will connect the slave at the next following GTID starting in
the next binlog. This could confuse the slave and make it mix the
start of one event group with the end of another.
But we detect this case here, by noticing the change of binlog name
which detects the missing rotate event at the end of the previous
binlog file. In this case, we reset the counters to make us not skip
the next event group, and queue an artificial Format Description
event. The previously fetched incomplete event group will then be
rolled back when the Format Description event is executed by the SQL
thread.
A similar case is if the reconnect somehow connects to a different
master server (like due to a network proxy or IP address takeover).
We detect this case by noticing a change of server_id and in this
case likewise rollback the partially received event group.
*/
Format_description_log_event fdle(4);
if (mi->prev_master_id != mi->master_id)
sql_print_warning("The server_id of master server changed in the "
"middle of GTID %u-%u-%llu. Assuming a change of "
"master server, so rolling back the previously "
"received partial transaction. Expected: %lu, "
"received: %lu", mi->last_queued_gtid.domain_id,
mi->last_queued_gtid.server_id,
mi->last_queued_gtid.seq_no,
mi->prev_master_id, mi->master_id);
else if (strcmp(rev.new_log_ident, mi->master_log_name) != 0)
sql_print_warning("Unexpected change of master binlog file name in the "
"middle of GTID %u-%u-%llu, assuming that master has "
"crashed and rolling back the transaction. Expected: "
"'%s', received: '%s'",
mi->last_queued_gtid.domain_id,
mi->last_queued_gtid.server_id,
mi->last_queued_gtid.seq_no,
mi->master_log_name, rev.new_log_ident);
mysql_mutex_lock(log_lock);
if (likely(!fdle.write(rli->relay_log.get_log_file()) &&
!rli->relay_log.flush_and_sync(NULL)))
{
rli->relay_log.harvest_bytes_written(&rli->log_space_total);
}
else
{
error= ER_SLAVE_RELAY_LOG_WRITE_FAILURE;
mysql_mutex_unlock(log_lock);
goto err;
}
rli->relay_log.signal_update();
mysql_mutex_unlock(log_lock);
mi->gtid_reconnect_event_skip_count= 0;
mi->events_queued_since_last_gtid= 0;
}
mi->prev_master_id= mi->master_id;
if (unlikely(process_io_rotate(mi, &rev)))
{
error= ER_SLAVE_RELAY_LOG_WRITE_FAILURE;
goto err;
}
/*
Checksum special cases for the fake Rotate (R_f) event caused by the protocol
of events generation and serialization in RL where Rotate of master is
queued right next to FD of slave.
Since it's only FD that carries the alg desc of FD_s has to apply to R_m.
Two special rules apply only to the first R_f which comes in before any FD_m.
The 2nd R_f should be compatible with the FD_s that must have taken over
the last seen FD_m's (A).
RSC_1: If OM \and fake Rotate \and slave is configured to
to compute checksum for its first FD event for RL
the fake Rotate gets checksummed here.
*/
if (uint4korr(&buf[0]) == 0 && checksum_alg == BINLOG_CHECKSUM_ALG_OFF &&
mi->rli.relay_log.relay_log_checksum_alg != BINLOG_CHECKSUM_ALG_OFF)
{
ha_checksum rot_crc= my_checksum(0L, NULL, 0);
event_len += BINLOG_CHECKSUM_LEN;
memcpy(rot_buf, buf, event_len - BINLOG_CHECKSUM_LEN);
int4store(&rot_buf[EVENT_LEN_OFFSET],
uint4korr(&rot_buf[EVENT_LEN_OFFSET]) + BINLOG_CHECKSUM_LEN);
rot_crc= my_checksum(rot_crc, (const uchar *) rot_buf,
event_len - BINLOG_CHECKSUM_LEN);
int4store(&rot_buf[event_len - BINLOG_CHECKSUM_LEN], rot_crc);
DBUG_ASSERT(event_len == uint4korr(&rot_buf[EVENT_LEN_OFFSET]));
DBUG_ASSERT(mi->rli.relay_log.description_event_for_queue->checksum_alg ==
mi->rli.relay_log.relay_log_checksum_alg);
/* the first one */
DBUG_ASSERT(mi->checksum_alg_before_fd != BINLOG_CHECKSUM_ALG_UNDEF);
save_buf= (char *) buf;
buf= rot_buf;
}
else
/*
RSC_2: If NM \and fake Rotate \and slave does not compute checksum
the fake Rotate's checksum is stripped off before relay-logging.
*/
if (uint4korr(&buf[0]) == 0 && checksum_alg != BINLOG_CHECKSUM_ALG_OFF &&
mi->rli.relay_log.relay_log_checksum_alg == BINLOG_CHECKSUM_ALG_OFF)
{
event_len -= BINLOG_CHECKSUM_LEN;
memcpy(rot_buf, buf, event_len);
int4store(&rot_buf[EVENT_LEN_OFFSET],
uint4korr(&rot_buf[EVENT_LEN_OFFSET]) - BINLOG_CHECKSUM_LEN);
DBUG_ASSERT(event_len == uint4korr(&rot_buf[EVENT_LEN_OFFSET]));
DBUG_ASSERT(mi->rli.relay_log.description_event_for_queue->checksum_alg ==
mi->rli.relay_log.relay_log_checksum_alg);
/* the first one */
DBUG_ASSERT(mi->checksum_alg_before_fd != BINLOG_CHECKSUM_ALG_UNDEF);
save_buf= (char *) buf;
buf= rot_buf;
}
/*
Now the I/O thread has just changed its mi->master_log_name, so
incrementing mi->master_log_pos is nonsense.
*/
inc_pos= 0;
break;
}
case FORMAT_DESCRIPTION_EVENT:
{
/*
Create an event, and save it (when we rotate the relay log, we will have
to write this event again).
*/
/*
We are the only thread which reads/writes description_event_for_queue.
The relay_log struct does not move (though some members of it can
change), so we needn't any lock (no rli->data_lock, no log lock).
*/
Format_description_log_event* tmp;
const char* errmsg;
// mark it as undefined that is irrelevant anymore
mi->checksum_alg_before_fd= BINLOG_CHECKSUM_ALG_UNDEF;
if (!(tmp= (Format_description_log_event*)
Log_event::read_log_event(buf, event_len, &errmsg,
mi->rli.relay_log.description_event_for_queue,
1)))
{
error= ER_SLAVE_RELAY_LOG_WRITE_FAILURE;
goto err;
}
delete mi->rli.relay_log.description_event_for_queue;
mi->rli.relay_log.description_event_for_queue= tmp;
if (tmp->checksum_alg == BINLOG_CHECKSUM_ALG_UNDEF)
tmp->checksum_alg= BINLOG_CHECKSUM_ALG_OFF;
/* installing new value of checksum Alg for relay log */
mi->rli.relay_log.relay_log_checksum_alg= tmp->checksum_alg;
/*
Do not queue any format description event that we receive after a
reconnect where we are skipping over a partial event group received
before the reconnect.
(If we queued such an event, and it was the first format_description
event after master restart, the slave SQL thread would think that
the partial event group before it in the relay log was from a
previous master crash and should be rolled back).
*/
if (unlikely(mi->gtid_reconnect_event_skip_count && !mi->gtid_event_seen))
gtid_skip_enqueue= true;
/*
Though this does some conversion to the slave's format, this will
preserve the master's binlog format version, and number of event types.
*/
/*
If the event was not requested by the slave (the slave did not ask for
it), i.e. has end_log_pos=0, we do not increment mi->master_log_pos
*/
inc_pos= uint4korr(buf+LOG_POS_OFFSET) ? event_len : 0;
DBUG_PRINT("info",("binlog format is now %d",
mi->rli.relay_log.description_event_for_queue->binlog_version));
}
break;
case HEARTBEAT_LOG_EVENT:
{
/*
HB (heartbeat) cannot come before RL (Relay)
*/
char llbuf[22];
Heartbeat_log_event hb(buf,
mi->rli.relay_log.relay_log_checksum_alg
!= BINLOG_CHECKSUM_ALG_OFF ?
event_len - BINLOG_CHECKSUM_LEN : event_len,
mi->rli.relay_log.description_event_for_queue);
if (!hb.is_valid())
{
error= ER_SLAVE_HEARTBEAT_FAILURE;
error_msg.append(STRING_WITH_LEN("inconsistent heartbeat event content;"));
error_msg.append(STRING_WITH_LEN("the event's data: log_file_name "));
error_msg.append(hb.get_log_ident(), (uint) strlen(hb.get_log_ident()));
error_msg.append(STRING_WITH_LEN(" log_pos "));
llstr(hb.log_pos, llbuf);
error_msg.append(llbuf, strlen(llbuf));
goto err;
}
mi->received_heartbeats++;
/*
compare local and event's versions of log_file, log_pos.
Heartbeat is sent only after an event corresponding to the corrdinates
the heartbeat carries.
Slave can not have a higher coordinate except in the only
special case when mi->master_log_name, master_log_pos have never
been updated by Rotate event i.e when slave does not have any history
with the master (and thereafter mi->master_log_pos is NULL).
Slave can have lower coordinates, if some event from master was omitted.
TODO: handling `when' for SHOW SLAVE STATUS' snds behind
*/
if ((memcmp(mi->master_log_name, hb.get_log_ident(), hb.get_ident_len())
&& mi->master_log_name != NULL)
|| mi->master_log_pos > hb.log_pos)
{
/* missed events of heartbeat from the past */
error= ER_SLAVE_HEARTBEAT_FAILURE;
error_msg.append(STRING_WITH_LEN("heartbeat is not compatible with local info;"));
error_msg.append(STRING_WITH_LEN("the event's data: log_file_name "));
error_msg.append(hb.get_log_ident(), (uint) strlen(hb.get_log_ident()));
error_msg.append(STRING_WITH_LEN(" log_pos "));
llstr(hb.log_pos, llbuf);
error_msg.append(llbuf, strlen(llbuf));
goto err;
}
goto skip_relay_logging;
}
break;
case GTID_LIST_EVENT:
{
const char *errmsg;
Gtid_list_log_event *glev;
Log_event *tmp;
uint32 flags;
if (!(tmp= Log_event::read_log_event(buf, event_len, &errmsg,
mi->rli.relay_log.description_event_for_queue,
opt_slave_sql_verify_checksum)))
{
error= ER_SLAVE_RELAY_LOG_WRITE_FAILURE;
goto err;
}
glev= static_cast<Gtid_list_log_event *>(tmp);
event_pos= glev->log_pos;
flags= glev->gl_flags;
delete glev;
/*
We use fake Gtid_list events to update the old-style position (among
other things).
Early code created fake Gtid_list events with zero log_pos, those should
not modify old-style position.
*/
if (event_pos == 0 || event_pos <= mi->master_log_pos)
inc_pos= 0;
else
inc_pos= event_pos - mi->master_log_pos;
if (mi->rli.until_condition == Relay_log_info::UNTIL_GTID &&
flags & Gtid_list_log_event::FLAG_UNTIL_REACHED)
{
char str_buf[128];
String str(str_buf, sizeof(str_buf), system_charset_info);
mi->rli.until_gtid_pos.to_string(&str);
sql_print_information("Slave I/O thread stops because it reached its"
" UNTIL master_gtid_pos %s", str.c_ptr_safe());
mi->abort_slave= true;
}
}
break;
case GTID_EVENT:
{
uchar gtid_flag;
if (Gtid_log_event::peek(buf, event_len, checksum_alg,
&event_gtid.domain_id, &event_gtid.server_id,
&event_gtid.seq_no, >id_flag,
rli->relay_log.description_event_for_queue))
{
error= ER_SLAVE_RELAY_LOG_WRITE_FAILURE;
goto err;
}
got_gtid_event= true;
if (mi->using_gtid == Master_info::USE_GTID_NO)
goto default_action;
if (unlikely(!mi->gtid_event_seen))
{
mi->gtid_event_seen= true;
if (mi->gtid_reconnect_event_skip_count)
{
/*
If we are reconnecting, and we need to skip a partial event group
already queued to the relay log before the reconnect, then we check
that we actually get the same event group (same GTID) as before, so
we do not end up with half of one group and half another.
The only way we should be able to receive a different GTID than what
we expect is if the binlog on the master (or more likely the whole
master server) was replaced with a different one, on the same IP
address, _and_ the new master happens to have domains in a different
order so we get the GTID from a different domain first. Still, it is
best to protect against this case.
*/
if (event_gtid.domain_id != mi->last_queued_gtid.domain_id ||
event_gtid.server_id != mi->last_queued_gtid.server_id ||
event_gtid.seq_no != mi->last_queued_gtid.seq_no)
{
bool first;
error= ER_SLAVE_UNEXPECTED_MASTER_SWITCH;
error_msg.append(STRING_WITH_LEN("Expected: "));
first= true;
rpl_slave_state_tostring_helper(&error_msg, &mi->last_queued_gtid,
&first);
error_msg.append(STRING_WITH_LEN(", received: "));
first= true;
rpl_slave_state_tostring_helper(&error_msg, &event_gtid, &first);
goto err;
}
}
}
if (unlikely(mi->gtid_reconnect_event_skip_count))
{
goto default_action;
}
/*
We have successfully queued to relay log everything before this GTID, so
in case of reconnect we can start from after any previous GTID.
(Normally we would have updated gtid_current_pos earlier at the end of
the previous event group, but better leave an extra check here for
safety).
*/
if (mi->events_queued_since_last_gtid)
{
mi->gtid_current_pos.update(&mi->last_queued_gtid);
mi->events_queued_since_last_gtid= 0;
}
mi->last_queued_gtid= event_gtid;
mi->last_queued_gtid_standalone=
(gtid_flag & Gtid_log_event::FL_STANDALONE) != 0;
++mi->events_queued_since_last_gtid;
inc_pos= event_len;
}
break;
default:
default_action:
if (mi->using_gtid != Master_info::USE_GTID_NO && mi->gtid_event_seen)
{
if (unlikely(mi->gtid_reconnect_event_skip_count))
{
--mi->gtid_reconnect_event_skip_count;
gtid_skip_enqueue= true;
}
else if (mi->events_queued_since_last_gtid)
++mi->events_queued_since_last_gtid;
}
inc_pos= event_len;
break;
}
/*
If we filter events master-side (eg. @@skip_replication), we will see holes
in the event positions from the master. If we see such a hole, adjust
mi->master_log_pos accordingly so we maintain the correct position (for
reconnect, MASTER_POS_WAIT(), etc.)
*/
if (inc_pos > 0 &&
event_len >= LOG_POS_OFFSET+4 &&
(event_pos= uint4korr(buf+LOG_POS_OFFSET)) > mi->master_log_pos + inc_pos)
{
inc_pos= event_pos - mi->master_log_pos;
DBUG_PRINT("info", ("Adjust master_log_pos %llu->%llu to account for "
"master-side filtering",
mi->master_log_pos + inc_pos, event_pos));
}
/*
If this event is originating from this server, don't queue it.
We don't check this for 3.23 events because it's simpler like this; 3.23
will be filtered anyway by the SQL slave thread which also tests the
server id (we must also keep this test in the SQL thread, in case somebody
upgrades a 4.0 slave which has a not-filtered relay log).
ANY event coming from ourselves can be ignored: it is obvious for queries;
for STOP_EVENT/ROTATE_EVENT/START_EVENT: these cannot come from ourselves
(--log-slave-updates would not log that) unless this slave is also its
direct master (an unsupported, useless setup!).
*/
mysql_mutex_lock(log_lock);
s_id= uint4korr(buf + SERVER_ID_OFFSET);
/*
Write the event to the relay log, unless we reconnected in the middle
of an event group and now need to skip the initial part of the group that
we already wrote before reconnecting.
*/
if (unlikely(gtid_skip_enqueue))
{
mi->master_log_pos+= inc_pos;
if ((uchar)buf[EVENT_TYPE_OFFSET] == FORMAT_DESCRIPTION_EVENT &&
s_id == mi->master_id)
{
/*
If we write this master's description event in the middle of an event
group due to GTID reconnect, SQL thread will think that master crashed
in the middle of the group and roll back the first half, so we must not.
But we still have to write an artificial copy of the masters description
event, to override the initial slave-version description event so that
SQL thread has the right information for parsing the events it reads.
*/
rli->relay_log.description_event_for_queue->created= 0;
rli->relay_log.description_event_for_queue->set_artificial_event();
if (rli->relay_log.append_no_lock
(rli->relay_log.description_event_for_queue))
error= ER_SLAVE_RELAY_LOG_WRITE_FAILURE;
else
rli->relay_log.harvest_bytes_written(&rli->log_space_total);
}
else if (mi->gtid_reconnect_event_skip_count == 0)
{
/*
Add a fake rotate event so that SQL thread can see the old-style
position where we re-connected in the middle of a GTID event group.
*/
Rotate_log_event fake_rev(mi->master_log_name, 0, mi->master_log_pos, 0);
fake_rev.server_id= mi->master_id;
if (rli->relay_log.append_no_lock(&fake_rev))
error= ER_SLAVE_RELAY_LOG_WRITE_FAILURE;
else
rli->relay_log.harvest_bytes_written(&rli->log_space_total);
}
}
else
if ((s_id == global_system_variables.server_id &&
!mi->rli.replicate_same_server_id) ||
/*
the following conjunction deals with IGNORE_SERVER_IDS, if set
If the master is on the ignore list, execution of
format description log events and rotate events is necessary.
*/
(mi->ignore_server_ids.elements > 0 &&
mi->shall_ignore_server_id(s_id) &&
/* everything is filtered out from non-master */
(s_id != mi->master_id ||
/* for the master meta information is necessary */
(buf[EVENT_TYPE_OFFSET] != FORMAT_DESCRIPTION_EVENT &&
buf[EVENT_TYPE_OFFSET] != ROTATE_EVENT))))
{
/*
Do not write it to the relay log.
a) We still want to increment mi->master_log_pos, so that we won't
re-read this event from the master if the slave IO thread is now
stopped/restarted (more efficient if the events we are ignoring are big
LOAD DATA INFILE).
b) We want to record that we are skipping events, for the information of
the slave SQL thread, otherwise that thread may let
rli->group_relay_log_pos stay too small if the last binlog's event is
ignored.
But events which were generated by this slave and which do not exist in
the master's binlog (i.e. Format_desc, Rotate & Stop) should not increment
mi->master_log_pos.
If the event is originated remotely and is being filtered out by
IGNORE_SERVER_IDS it increments mi->master_log_pos
as well as rli->group_relay_log_pos.
*/
if (!(s_id == global_system_variables.server_id &&
!mi->rli.replicate_same_server_id) ||
(buf[EVENT_TYPE_OFFSET] != FORMAT_DESCRIPTION_EVENT &&
buf[EVENT_TYPE_OFFSET] != ROTATE_EVENT &&
buf[EVENT_TYPE_OFFSET] != STOP_EVENT))
{
mi->master_log_pos+= inc_pos;
memcpy(rli->ign_master_log_name_end, mi->master_log_name, FN_REFLEN);
DBUG_ASSERT(rli->ign_master_log_name_end[0]);
rli->ign_master_log_pos_end= mi->master_log_pos;
if (got_gtid_event)
rli->ign_gtids.update(&event_gtid);
}
rli->relay_log.signal_update(); // the slave SQL thread needs to re-check
DBUG_PRINT("info", ("master_log_pos: %lu, event originating from %u server, ignored",
(ulong) mi->master_log_pos, uint4korr(buf + SERVER_ID_OFFSET)));
}
else
{
if (likely(!(rli->relay_log.appendv(buf,event_len,0))))
{
mi->master_log_pos+= inc_pos;
DBUG_PRINT("info", ("master_log_pos: %lu", (ulong) mi->master_log_pos));
rli->relay_log.harvest_bytes_written(&rli->log_space_total);
}
else
{
error= ER_SLAVE_RELAY_LOG_WRITE_FAILURE;
}
rli->ign_master_log_name_end[0]= 0; // last event is not ignored
if (got_gtid_event)
rli->ign_gtids.remove_if_present(&event_gtid);
if (save_buf != NULL)
buf= save_buf;
}
mysql_mutex_unlock(log_lock);
if (!error &&
mi->using_gtid != Master_info::USE_GTID_NO &&
mi->events_queued_since_last_gtid > 0 &&
( (mi->last_queued_gtid_standalone &&
!Log_event::is_part_of_group((Log_event_type)(uchar)
buf[EVENT_TYPE_OFFSET])) ||
(!mi->last_queued_gtid_standalone &&
((uchar)buf[EVENT_TYPE_OFFSET] == XID_EVENT ||
((uchar)buf[EVENT_TYPE_OFFSET] == QUERY_EVENT &&
Query_log_event::peek_is_commit_rollback(buf, event_len,
checksum_alg))))))
{
/*
The whole of the current event group is queued. So in case of
reconnect we can start from after the current GTID.
*/
mi->gtid_current_pos.update(&mi->last_queued_gtid);
mi->events_queued_since_last_gtid= 0;
}
skip_relay_logging:
err:
if (unlock_data_lock)
mysql_mutex_unlock(&mi->data_lock);
DBUG_PRINT("info", ("error: %d", error));
if (error)
mi->report(ERROR_LEVEL, error, NULL, ER(error),
(error == ER_SLAVE_RELAY_LOG_WRITE_FAILURE)?
"could not queue event from master" :
error_msg.ptr());
DBUG_RETURN(error);
}
void end_relay_log_info(Relay_log_info* rli)
{
DBUG_ENTER("end_relay_log_info");
if (!rli->inited)
DBUG_VOID_RETURN;
if (rli->info_fd >= 0)
{
end_io_cache(&rli->info_file);
mysql_file_close(rli->info_fd, MYF(MY_WME));
rli->info_fd = -1;
}
if (rli->cur_log_fd >= 0)
{
end_io_cache(&rli->cache_buf);
mysql_file_close(rli->cur_log_fd, MYF(MY_WME));
rli->cur_log_fd = -1;
}
rli->inited = 0;
rli->relay_log.close(LOG_CLOSE_INDEX | LOG_CLOSE_STOP_EVENT);
rli->relay_log.harvest_bytes_written(&rli->log_space_total);
/*
Delete the slave's temporary tables from memory.
In the future there will be other actions than this, to ensure persistance
of slave's temp tables after shutdown.
*/
rli->close_temporary_tables();
DBUG_VOID_RETURN;
}
/**
Hook to detach the active VIO before closing a connection handle.
The client API might close the connection (and associated data)
in case it encounters a unrecoverable (network) error. This hook
is called from the client code before the VIO handle is deleted
allows the thread to detach the active vio so it does not point
to freed memory.
Other calls to THD::clear_active_vio throughout this module are
redundant due to the hook but are left in place for illustrative
purposes.
*/
extern "C" void slave_io_thread_detach_vio()
{
#ifdef SIGNAL_WITH_VIO_CLOSE
THD *thd= current_thd;
if (thd && thd->slave_thread)
thd->clear_active_vio();
#endif
}
/*
Try to connect until successful or slave killed
SYNPOSIS
safe_connect()
thd Thread handler for slave
mysql MySQL connection handle
mi Replication handle
RETURN
0 ok
# Error
*/
static int safe_connect(THD* thd, MYSQL* mysql, Master_info* mi)
{
DBUG_ENTER("safe_connect");
DBUG_RETURN(connect_to_master(thd, mysql, mi, 0, 0));
}
/*
SYNPOSIS
connect_to_master()
IMPLEMENTATION
Try to connect until successful or slave killed or we have retried
master_retry_count times
*/
static int connect_to_master(THD* thd, MYSQL* mysql, Master_info* mi,
bool reconnect, bool suppress_warnings)
{
int slave_was_killed;
int last_errno= -2; // impossible error
ulong err_count=0;
char llbuff[22];
my_bool my_true= 1;
DBUG_ENTER("connect_to_master");
set_slave_max_allowed_packet(thd, mysql);
#ifndef DBUG_OFF
mi->events_till_disconnect = disconnect_slave_event_count;
#endif
ulong client_flag= 0;
if (opt_slave_compressed_protocol)
client_flag=CLIENT_COMPRESS; /* We will use compression */
mysql_options(mysql, MYSQL_OPT_CONNECT_TIMEOUT, (char *) &slave_net_timeout);
mysql_options(mysql, MYSQL_OPT_READ_TIMEOUT, (char *) &slave_net_timeout);
mysql_options(mysql, MYSQL_OPT_USE_THREAD_SPECIFIC_MEMORY,
(char*) &my_true);
#ifdef HAVE_OPENSSL
if (mi->ssl)
{
mysql_ssl_set(mysql,
mi->ssl_key[0]?mi->ssl_key:0,
mi->ssl_cert[0]?mi->ssl_cert:0,
mi->ssl_ca[0]?mi->ssl_ca:0,
mi->ssl_capath[0]?mi->ssl_capath:0,
mi->ssl_cipher[0]?mi->ssl_cipher:0);
mysql_options(mysql, MYSQL_OPT_SSL_VERIFY_SERVER_CERT,
&mi->ssl_verify_server_cert);
mysql_options(mysql, MYSQL_OPT_SSL_CRLPATH,
mi->ssl_crlpath[0] ? mi->ssl_crlpath : 0);
mysql_options(mysql, MYSQL_OPT_SSL_VERIFY_SERVER_CERT,
&mi->ssl_verify_server_cert);
}
#endif
mysql_options(mysql, MYSQL_SET_CHARSET_NAME, default_charset_info->csname);
/* This one is not strictly needed but we have it here for completeness */
mysql_options(mysql, MYSQL_SET_CHARSET_DIR, (char *) charsets_dir);
/* Set MYSQL_PLUGIN_DIR in case master asks for an external authentication plugin */
if (opt_plugin_dir_ptr && *opt_plugin_dir_ptr)
mysql_options(mysql, MYSQL_PLUGIN_DIR, opt_plugin_dir_ptr);
/* we disallow empty users */
if (mi->user == NULL || mi->user[0] == 0)
{
mi->report(ERROR_LEVEL, ER_SLAVE_FATAL_ERROR, NULL,
ER(ER_SLAVE_FATAL_ERROR),
"Invalid (empty) username when attempting to "
"connect to the master server. Connection attempt "
"terminated.");
DBUG_RETURN(1);
}
while (!(slave_was_killed = io_slave_killed(mi)) &&
(reconnect ? mysql_reconnect(mysql) != 0 :
mysql_real_connect(mysql, mi->host, mi->user, mi->password, 0,
mi->port, 0, client_flag) == 0))
{
/* Don't repeat last error */
if ((int)mysql_errno(mysql) != last_errno)
{
last_errno=mysql_errno(mysql);
suppress_warnings= 0;
mi->report(ERROR_LEVEL, last_errno, NULL,
"error %s to master '%s@%s:%d'"
" - retry-time: %d retries: %lu message: %s",
(reconnect ? "reconnecting" : "connecting"),
mi->user, mi->host, mi->port,
mi->connect_retry, master_retry_count,
mysql_error(mysql));
}
/*
By default we try forever. The reason is that failure will trigger
master election, so if the user did not set master_retry_count we
do not want to have election triggered on the first failure to
connect
*/
if (++err_count == master_retry_count)
{
slave_was_killed=1;
if (reconnect)
change_rpl_status(RPL_ACTIVE_SLAVE,RPL_LOST_SOLDIER);
break;
}
slave_sleep(thd,mi->connect_retry,io_slave_killed, mi);
}
if (!slave_was_killed)
{
mi->clear_error(); // clear possible left over reconnect error
if (reconnect)
{
if (!suppress_warnings && global_system_variables.log_warnings)
sql_print_information("Slave: connected to master '%s@%s:%d',\
replication resumed in log '%s' at position %s", mi->user,
mi->host, mi->port,
IO_RPL_LOG_NAME,
llstr(mi->master_log_pos,llbuff));
}
else
{
change_rpl_status(RPL_IDLE_SLAVE,RPL_ACTIVE_SLAVE);
general_log_print(thd, COM_CONNECT_OUT, "%s@%s:%d",
mi->user, mi->host, mi->port);
}
#ifdef SIGNAL_WITH_VIO_CLOSE
thd->set_active_vio(mysql->net.vio);
#endif
}
mysql->reconnect= 1;
DBUG_PRINT("exit",("slave_was_killed: %d", slave_was_killed));
DBUG_RETURN(slave_was_killed);
}
/*
safe_reconnect()
IMPLEMENTATION
Try to connect until successful or slave killed or we have retried
master_retry_count times
*/
static int safe_reconnect(THD* thd, MYSQL* mysql, Master_info* mi,
bool suppress_warnings)
{
DBUG_ENTER("safe_reconnect");
DBUG_RETURN(connect_to_master(thd, mysql, mi, 1, suppress_warnings));
}
#ifdef NOT_USED
MYSQL *rpl_connect_master(MYSQL *mysql)
{
Master_info *mi= my_pthread_getspecific_ptr(Master_info*, RPL_MASTER_INFO);
bool allocated= false;
my_bool my_true= 1;
THD *thd;
if (!mi)
{
sql_print_error("'rpl_connect_master' must be called in slave I/O thread context.");
return NULL;
}
thd= mi->io_thd;
if (!mysql)
{
if(!(mysql= mysql_init(NULL)))
{
sql_print_error("rpl_connect_master: failed in mysql_init()");
return NULL;
}
allocated= true;
}
/*
XXX: copied from connect_to_master, this function should not
change the slave status, so we cannot use connect_to_master
directly
TODO: make this part a seperate function to eliminate duplication
*/
mysql_options(mysql, MYSQL_OPT_CONNECT_TIMEOUT, (char *) &slave_net_timeout);
mysql_options(mysql, MYSQL_OPT_READ_TIMEOUT, (char *) &slave_net_timeout);
mysql_options(mysql, MYSQL_OPT_USE_THREAD_SPECIFIC_MEMORY,
(char*) &my_true);
#ifdef HAVE_OPENSSL
if (mi->ssl)
{
mysql_ssl_set(mysql,
mi->ssl_key[0]?mi->ssl_key:0,
mi->ssl_cert[0]?mi->ssl_cert:0,
mi->ssl_ca[0]?mi->ssl_ca:0,
mi->ssl_capath[0]?mi->ssl_capath:0,
mi->ssl_cipher[0]?mi->ssl_cipher:0);
mysql_options(mysql, MYSQL_OPT_SSL_VERIFY_SERVER_CERT,
&mi->ssl_verify_server_cert);
}
#endif
mysql_options(mysql, MYSQL_SET_CHARSET_NAME, default_charset_info->csname);
/* This one is not strictly needed but we have it here for completeness */
mysql_options(mysql, MYSQL_SET_CHARSET_DIR, (char *) charsets_dir);
if (mi->user == NULL
|| mi->user[0] == 0
|| io_slave_killed( mi)
|| !mysql_real_connect(mysql, mi->host, mi->user, mi->password, 0,
mi->port, 0, 0))
{
if (!io_slave_killed( mi))
sql_print_error("rpl_connect_master: error connecting to master: %s (server_error: %d)",
mysql_error(mysql), mysql_errno(mysql));
if (allocated)
mysql_close(mysql); // this will free the object
return NULL;
}
return mysql;
}
#endif
/*
Store the file and position where the execute-slave thread are in the
relay log.
SYNOPSIS
flush_relay_log_info()
rli Relay log information
NOTES
- As this is only called by the slave thread or on STOP SLAVE, with the
log_lock grabbed and the slave thread stopped, we don't need to have
a lock here.
- If there is an active transaction, then we don't update the position
in the relay log. This is to ensure that we re-execute statements
if we die in the middle of an transaction that was rolled back.
- As a transaction never spans binary logs, we don't have to handle the
case where we do a relay-log-rotation in the middle of the transaction.
If this would not be the case, we would have to ensure that we
don't delete the relay log file where the transaction started when
we switch to a new relay log file.
TODO
- Change the log file information to a binary format to avoid calling
longlong2str.
RETURN VALUES
0 ok
1 write error
*/
bool flush_relay_log_info(Relay_log_info* rli)
{
bool error=0;
DBUG_ENTER("flush_relay_log_info");
if (unlikely(rli->no_storage))
DBUG_RETURN(0);
IO_CACHE *file = &rli->info_file;
char buff[FN_REFLEN*2+22*2+4], *pos;
my_b_seek(file, 0L);
pos=strmov(buff, rli->group_relay_log_name);
*pos++='\n';
pos= longlong10_to_str(rli->group_relay_log_pos, pos, 10);
*pos++='\n';
pos=strmov(pos, rli->group_master_log_name);
*pos++='\n';
pos=longlong10_to_str(rli->group_master_log_pos, pos, 10);
*pos='\n';
if (my_b_write(file, (uchar*) buff, (size_t) (pos-buff)+1))
error=1;
if (flush_io_cache(file))
error=1;
if (sync_relayloginfo_period &&
!error &&
++(rli->sync_counter) >= sync_relayloginfo_period)
{
if (my_sync(rli->info_fd, MYF(MY_WME)))
error=1;
rli->sync_counter= 0;
}
/*
Flushing the relay log is done by the slave I/O thread
or by the user on STOP SLAVE.
*/
DBUG_RETURN(error);
}
/*
Called when we notice that the current "hot" log got rotated under our feet.
*/
static IO_CACHE *reopen_relay_log(Relay_log_info *rli, const char **errmsg)
{
DBUG_ENTER("reopen_relay_log");
DBUG_ASSERT(rli->cur_log != &rli->cache_buf);
DBUG_ASSERT(rli->cur_log_fd == -1);
IO_CACHE *cur_log = rli->cur_log=&rli->cache_buf;
if ((rli->cur_log_fd=open_binlog(cur_log,rli->event_relay_log_name,
errmsg)) <0)
DBUG_RETURN(0);
/*
We want to start exactly where we was before:
relay_log_pos Current log pos
pending Number of bytes already processed from the event
*/
rli->event_relay_log_pos= MY_MAX(rli->event_relay_log_pos, BIN_LOG_HEADER_SIZE);
my_b_seek(cur_log,rli->event_relay_log_pos);
DBUG_RETURN(cur_log);
}
/**
Reads next event from the relay log. Should be called from the
slave IO thread.
@param rli Relay_log_info structure for the slave IO thread.
@return The event read, or NULL on error. If an error occurs, the
error is reported through the sql_print_information() or
sql_print_error() functions.
The size of the read event (in bytes) is returned in *event_size.
*/
static Log_event* next_event(rpl_group_info *rgi, ulonglong *event_size)
{
Log_event* ev;
Relay_log_info *rli= rgi->rli;
IO_CACHE* cur_log = rli->cur_log;
mysql_mutex_t *log_lock = rli->relay_log.get_log_lock();
const char* errmsg=0;
DBUG_ENTER("next_event");
DBUG_ASSERT(rgi->thd != 0 && rgi->thd == rli->sql_driver_thd);
*event_size= 0;
#ifndef DBUG_OFF
if (abort_slave_event_count && !rli->events_till_abort--)
DBUG_RETURN(0);
#endif
/*
For most operations we need to protect rli members with data_lock,
so we assume calling function acquired this mutex for us and we will
hold it for the most of the loop below However, we will release it
whenever it is worth the hassle, and in the cases when we go into a
mysql_cond_wait() with the non-data_lock mutex
*/
mysql_mutex_assert_owner(&rli->data_lock);
while (!sql_slave_killed(rgi))
{
/*
We can have two kinds of log reading:
hot_log:
rli->cur_log points at the IO_CACHE of relay_log, which
is actively being updated by the I/O thread. We need to be careful
in this case and make sure that we are not looking at a stale log that
has already been rotated. If it has been, we reopen the log.
The other case is much simpler:
We just have a read only log that nobody else will be updating.
*/
ulonglong old_pos;
bool hot_log;
if ((hot_log = (cur_log != &rli->cache_buf)))
{
DBUG_ASSERT(rli->cur_log_fd == -1); // foreign descriptor
mysql_mutex_lock(log_lock);
/*
Reading xxx_file_id is safe because the log will only
be rotated when we hold relay_log.LOCK_log
*/
if (rli->relay_log.get_open_count() != rli->cur_log_old_open_count)
{
// The master has switched to a new log file; Reopen the old log file
cur_log=reopen_relay_log(rli, &errmsg);
mysql_mutex_unlock(log_lock);
if (!cur_log) // No more log files
goto err;
hot_log=0; // Using old binary log
}
}
/*
As there is no guarantee that the relay is open (for example, an I/O
error during a write by the slave I/O thread may have closed it), we
have to test it.
*/
if (!my_b_inited(cur_log))
goto err;
#ifndef DBUG_OFF
{
/* This is an assertion which sometimes fails, let's try to track it */
char llbuf1[22], llbuf2[22];
DBUG_PRINT("info", ("my_b_tell(cur_log)=%s rli->event_relay_log_pos=%s",
llstr(my_b_tell(cur_log),llbuf1),
llstr(rli->event_relay_log_pos,llbuf2)));
DBUG_ASSERT(my_b_tell(cur_log) >= BIN_LOG_HEADER_SIZE);
DBUG_ASSERT(opt_slave_parallel_threads > 0 ||
my_b_tell(cur_log) == rli->event_relay_log_pos);
}
#endif
/*
Relay log is always in new format - if the master is 3.23, the
I/O thread will convert the format for us.
A problem: the description event may be in a previous relay log. So if
the slave has been shutdown meanwhile, we would have to look in old relay
logs, which may even have been deleted. So we need to write this
description event at the beginning of the relay log.
When the relay log is created when the I/O thread starts, easy: the
master will send the description event and we will queue it.
But if the relay log is created by new_file(): then the solution is:
MYSQL_BIN_LOG::open() will write the buffered description event.
*/
old_pos= rli->event_relay_log_pos;
if ((ev= Log_event::read_log_event(cur_log,0,
rli->relay_log.description_event_for_exec,
opt_slave_sql_verify_checksum)))
{
/*
read it while we have a lock, to avoid a mutex lock in
inc_event_relay_log_pos()
*/
rli->future_event_relay_log_pos= my_b_tell(cur_log);
*event_size= rli->future_event_relay_log_pos - old_pos;
if (hot_log)
mysql_mutex_unlock(log_lock);
rli->sql_thread_caught_up= false;
DBUG_RETURN(ev);
}
if (opt_reckless_slave) // For mysql-test
cur_log->error = 0;
if (cur_log->error < 0)
{
errmsg = "slave SQL thread aborted because of I/O error";
if (hot_log)
mysql_mutex_unlock(log_lock);
goto err;
}
if (!cur_log->error) /* EOF */
{
/*
On a hot log, EOF means that there are no more updates to
process and we must block until I/O thread adds some and
signals us to continue
*/
if (hot_log)
{
/*
We say in Seconds_Behind_Master that we have "caught up". Note that
for example if network link is broken but I/O slave thread hasn't
noticed it (slave_net_timeout not elapsed), then we'll say "caught
up" whereas we're not really caught up. Fixing that would require
internally cutting timeout in smaller pieces in network read, no
thanks. Another example: SQL has caught up on I/O, now I/O has read
a new event and is queuing it; the false "0" will exist until SQL
finishes executing the new event; it will be look abnormal only if
the events have old timestamps (then you get "many", 0, "many").
Transient phases like this can be fixed with implemeting
Heartbeat event which provides the slave the status of the
master at time the master does not have any new update to send.
Seconds_Behind_Master would be zero only when master has no
more updates in binlog for slave. The heartbeat can be sent
in a (small) fraction of slave_net_timeout. Until it's done
rli->sql_thread_caught_up is temporarely (for time of waiting for
the following event) set whenever EOF is reached.
*/
rli->sql_thread_caught_up= true;
DBUG_ASSERT(rli->relay_log.get_open_count() ==
rli->cur_log_old_open_count);
if (rli->ign_master_log_name_end[0])
{
/* We generate and return a Rotate, to make our positions advance */
DBUG_PRINT("info",("seeing an ignored end segment"));
ev= new Rotate_log_event(rli->ign_master_log_name_end,
0, rli->ign_master_log_pos_end,
Rotate_log_event::DUP_NAME);
rli->ign_master_log_name_end[0]= 0;
mysql_mutex_unlock(log_lock);
if (unlikely(!ev))
{
errmsg= "Slave SQL thread failed to create a Rotate event "
"(out of memory?), SHOW SLAVE STATUS may be inaccurate";
goto err;
}
ev->server_id= 0; // don't be ignored by slave SQL thread
DBUG_RETURN(ev);
}
if (rli->ign_gtids.count())
{
/* We generate and return a Gtid_list, to update gtid_slave_pos. */
DBUG_PRINT("info",("seeing ignored end gtids"));
ev= new Gtid_list_log_event(&rli->ign_gtids,
Gtid_list_log_event::FLAG_IGN_GTIDS);
rli->ign_gtids.reset();
mysql_mutex_unlock(log_lock);
if (unlikely(!ev))
{
errmsg= "Slave SQL thread failed to create a Gtid_list event "
"(out of memory?), gtid_slave_pos may be inaccurate";
goto err;
}
ev->server_id= 0; // don't be ignored by slave SQL thread
ev->set_artificial_event(); // Don't mess up Exec_Master_Log_Pos
DBUG_RETURN(ev);
}
/*
We have to check sql_slave_killed() here an extra time.
Otherwise we may miss a wakeup, since last check was done
without holding LOCK_log.
*/
if (sql_slave_killed(rgi))
{
mysql_mutex_unlock(log_lock);
break;
}
/*
We can, and should release data_lock while we are waiting for
update. If we do not, show slave status will block
*/
mysql_mutex_unlock(&rli->data_lock);
/*
Possible deadlock :
- the I/O thread has reached log_space_limit
- the SQL thread has read all relay logs, but cannot purge for some
reason:
* it has already purged all logs except the current one
* there are other logs than the current one but they're involved in
a transaction that finishes in the current one (or is not finished)
Solution :
Wake up the possibly waiting I/O thread, and set a boolean asking
the I/O thread to temporarily ignore the log_space_limit
constraint, because we do not want the I/O thread to block because of
space (it's ok if it blocks for any other reason (e.g. because the
master does not send anything). Then the I/O thread stops waiting
and reads one more event and starts honoring log_space_limit again.
If the SQL thread needs more events to be able to rotate the log (it
might need to finish the current group first), then it can ask for
one more at a time. Thus we don't outgrow the relay log indefinitely,
but rather in a controlled manner, until the next rotate.
When the SQL thread starts it sets ignore_log_space_limit to false.
We should also reset ignore_log_space_limit to 0 when the user does
RESET SLAVE, but in fact, no need as RESET SLAVE requires that the
slave be stopped, and the SQL thread sets ignore_log_space_limit
to 0 when
it stops.
*/
mysql_mutex_lock(&rli->log_space_lock);
/*
If we have reached the limit of the relay space and we
are going to sleep, waiting for more events:
1. If outside a group, SQL thread asks the IO thread
to force a rotation so that the SQL thread purges
logs next time it processes an event (thus space is
freed).
2. If in a group, SQL thread asks the IO thread to
ignore the limit and queues yet one more event
so that the SQL thread finishes the group and
is are able to rotate and purge sometime soon.
*/
if (rli->log_space_limit &&
rli->log_space_limit < rli->log_space_total)
{
/* force rotation if not in an unfinished group */
rli->sql_force_rotate_relay= !rli->is_in_group();
/* ask for one more event */
rli->ignore_log_space_limit= true;
}
/*
If the I/O thread is blocked, unblock it. Ok to broadcast
after unlock, because the mutex is only destroyed in
~Relay_log_info(), i.e. when rli is destroyed, and rli will
not be destroyed before we exit the present function.
*/
mysql_mutex_unlock(&rli->log_space_lock);
mysql_cond_broadcast(&rli->log_space_cond);
// Note that wait_for_update_relay_log unlocks lock_log !
rli->relay_log.wait_for_update_relay_log(rli->sql_driver_thd);
// re-acquire data lock since we released it earlier
mysql_mutex_lock(&rli->data_lock);
rli->sql_thread_caught_up= false;
continue;
}
/*
If the log was not hot, we need to move to the next log in
sequence. The next log could be hot or cold, we deal with both
cases separately after doing some common initialization
*/
end_io_cache(cur_log);
DBUG_ASSERT(rli->cur_log_fd >= 0);
mysql_file_close(rli->cur_log_fd, MYF(MY_WME));
rli->cur_log_fd = -1;
rli->last_inuse_relaylog->completed= true;
if (relay_log_purge)
{
/*
purge_first_log will properly set up relay log coordinates in rli.
If the group's coordinates are equal to the event's coordinates
(i.e. the relay log was not rotated in the middle of a group),
we can purge this relay log too.
We do ulonglong and string comparisons, this may be slow but
- purging the last relay log is nice (it can save 1GB of disk), so we
like to detect the case where we can do it, and given this,
- I see no better detection method
- purge_first_log is not called that often
*/
if (rli->relay_log.purge_first_log
(rli,
rli->group_relay_log_pos == rli->event_relay_log_pos
&& !strcmp(rli->group_relay_log_name,rli->event_relay_log_name)))
{
errmsg = "Error purging processed logs";
goto err;
}
}
else
{
/*
If hot_log is set, then we already have a lock on
LOCK_log. If not, we have to get the lock.
According to Sasha, the only time this code will ever be executed
is if we are recovering from a bug.
*/
if (rli->relay_log.find_next_log(&rli->linfo, !hot_log))
{
errmsg = "error switching to the next log";
goto err;
}
rli->event_relay_log_pos = BIN_LOG_HEADER_SIZE;
strmake_buf(rli->event_relay_log_name,rli->linfo.log_file_name);
flush_relay_log_info(rli);
}
/*
Now we want to open this next log. To know if it's a hot log (the one
being written by the I/O thread now) or a cold log, we can use
is_active(); if it is hot, we use the I/O cache; if it's cold we open
the file normally. But if is_active() reports that the log is hot, this
may change between the test and the consequence of the test. So we may
open the I/O cache whereas the log is now cold, which is nonsense.
To guard against this, we need to have LOCK_log.
*/
DBUG_PRINT("info",("hot_log: %d",hot_log));
if (!hot_log) /* if hot_log, we already have this mutex */
mysql_mutex_lock(log_lock);
if (rli->relay_log.is_active(rli->linfo.log_file_name))
{
rli->cur_log= cur_log= rli->relay_log.get_log_file();
rli->cur_log_old_open_count= rli->relay_log.get_open_count();
DBUG_ASSERT(rli->cur_log_fd == -1);
/*
When the SQL thread is [stopped and] (re)started the
following may happen:
1. Log was hot at stop time and remains hot at restart
SQL thread reads again from hot_log (SQL thread was
reading from the active log when it was stopped and the
very same log is still active on SQL thread restart).
In this case, my_b_seek is performed on cur_log, while
cur_log points to relay_log.get_log_file();
2. Log was hot at stop time but got cold before restart
The log was hot when SQL thread stopped, but it is not
anymore when the SQL thread restarts.
In this case, the SQL thread reopens the log, using
cache_buf, ie, cur_log points to &cache_buf, and thence
its coordinates are reset.
3. Log was already cold at stop time
The log was not hot when the SQL thread stopped, and, of
course, it will not be hot when it restarts.
In this case, the SQL thread opens the cold log again,
using cache_buf, ie, cur_log points to &cache_buf, and
thence its coordinates are reset.
4. Log was hot at stop time, DBA changes to previous cold
log and restarts SQL thread
The log was hot when the SQL thread was stopped, but the
user changed the coordinates of the SQL thread to
restart from a previous cold log.
In this case, at start time, cur_log points to a cold
log, opened using &cache_buf as cache, and coordinates
are reset. However, as it moves on to the next logs, it
will eventually reach the hot log. If the hot log is the
same at the time the SQL thread was stopped, then
coordinates were not reset - the cur_log will point to
relay_log.get_log_file(), and not a freshly opened
IO_CACHE through cache_buf. For this reason we need to
deploy a my_b_seek before calling check_binlog_magic at
this point of the code (see: BUG#55263 for more
details).
NOTES:
- We must keep the LOCK_log to read the 4 first bytes, as
this is a hot log (same as when we call read_log_event()
above: for a hot log we take the mutex).
- Because of scenario #4 above, we need to have a
my_b_seek here. Otherwise, we might hit the assertion
inside check_binlog_magic.
*/
my_b_seek(cur_log, (my_off_t) 0);
if (check_binlog_magic(cur_log,&errmsg))
{
if (!hot_log)
mysql_mutex_unlock(log_lock);
goto err;
}
if (rli->alloc_inuse_relaylog(rli->linfo.log_file_name))
{
if (!hot_log)
mysql_mutex_unlock(log_lock);
goto err;
}
if (!hot_log)
mysql_mutex_unlock(log_lock);
continue;
}
if (!hot_log)
mysql_mutex_unlock(log_lock);
/*
if we get here, the log was not hot, so we will have to open it
ourselves. We are sure that the log is still not hot now (a log can get
from hot to cold, but not from cold to hot). No need for LOCK_log.
*/
// open_binlog() will check the magic header
if ((rli->cur_log_fd=open_binlog(cur_log,rli->linfo.log_file_name,
&errmsg)) <0)
goto err;
if (rli->alloc_inuse_relaylog(rli->linfo.log_file_name))
goto err;
}
else
{
/*
Read failed with a non-EOF error.
TODO: come up with something better to handle this error
*/
if (hot_log)
mysql_mutex_unlock(log_lock);
sql_print_error("Slave SQL thread: I/O error reading \
event(errno: %d cur_log->error: %d)",
my_errno,cur_log->error);
// set read position to the beginning of the event
my_b_seek(cur_log,rli->event_relay_log_pos);
/* otherwise, we have had a partial read */
errmsg = "Aborting slave SQL thread because of partial event read";
break; // To end of function
}
}
if (!errmsg && global_system_variables.log_warnings)
{
sql_print_information("Error reading relay log event: %s",
"slave SQL thread was killed");
DBUG_RETURN(0);
}
err:
if (errmsg)
sql_print_error("Error reading relay log event: %s", errmsg);
DBUG_RETURN(0);
}
/*
Rotate a relay log (this is used only by FLUSH LOGS; the automatic rotation
because of size is simpler because when we do it we already have all relevant
locks; here we don't, so this function is mainly taking locks).
Returns nothing as we cannot catch any error (MYSQL_BIN_LOG::new_file()
is void).
*/
int rotate_relay_log(Master_info* mi)
{
DBUG_ENTER("rotate_relay_log");
Relay_log_info* rli= &mi->rli;
int error= 0;
DBUG_EXECUTE_IF("crash_before_rotate_relaylog", DBUG_SUICIDE(););
/*
We need to test inited because otherwise, new_file() will attempt to lock
LOCK_log, which may not be inited (if we're not a slave).
*/
if (!rli->inited)
{
DBUG_PRINT("info", ("rli->inited == 0"));
goto end;
}
/* If the relay log is closed, new_file() will do nothing. */
if ((error= rli->relay_log.new_file()))
goto end;
/*
We harvest now, because otherwise BIN_LOG_HEADER_SIZE will not immediately
be counted, so imagine a succession of FLUSH LOGS and assume the slave
threads are started:
relay_log_space decreases by the size of the deleted relay log, but does
not increase, so flush-after-flush we may become negative, which is wrong.
Even if this will be corrected as soon as a query is replicated on the
slave (because the I/O thread will then call harvest_bytes_written() which
will harvest all these BIN_LOG_HEADER_SIZE we forgot), it may give strange
output in SHOW SLAVE STATUS meanwhile. So we harvest now.
If the log is closed, then this will just harvest the last writes, probably
0 as they probably have been harvested.
Note that it needs to be protected by mi->data_lock.
*/
mysql_mutex_assert_owner(&mi->data_lock);
rli->relay_log.harvest_bytes_written(&rli->log_space_total);
end:
DBUG_RETURN(error);
}
/**
Detects, based on master's version (as found in the relay log), if master
has a certain bug.
@param rli Relay_log_info which tells the master's version
@param bug_id Number of the bug as found in bugs.mysql.com
@param report bool report error message, default TRUE
@param pred Predicate function that will be called with @c param to
check for the bug. If the function return @c true, the bug is present,
otherwise, it is not.
@param param State passed to @c pred function.
@return TRUE if master has the bug, FALSE if it does not.
*/
bool rpl_master_has_bug(const Relay_log_info *rli, uint bug_id, bool report,
bool (*pred)(const void *), const void *param)
{
struct st_version_range_for_one_bug {
uint bug_id;
const uchar introduced_in[3]; // first version with bug
const uchar fixed_in[3]; // first version with fix
};
static struct st_version_range_for_one_bug versions_for_all_bugs[]=
{
{24432, { 5, 0, 24 }, { 5, 0, 38 } },
{24432, { 5, 1, 12 }, { 5, 1, 17 } },
{33029, { 5, 0, 0 }, { 5, 0, 58 } },
{33029, { 5, 1, 0 }, { 5, 1, 12 } },
{37426, { 5, 1, 0 }, { 5, 1, 26 } },
};
const uchar *master_ver=
rli->relay_log.description_event_for_exec->server_version_split.ver;
DBUG_ASSERT(sizeof(rli->relay_log.description_event_for_exec->server_version_split.ver) == 3);
for (uint i= 0;
i < sizeof(versions_for_all_bugs)/sizeof(*versions_for_all_bugs);i++)
{
const uchar *introduced_in= versions_for_all_bugs[i].introduced_in,
*fixed_in= versions_for_all_bugs[i].fixed_in;
if ((versions_for_all_bugs[i].bug_id == bug_id) &&
(memcmp(introduced_in, master_ver, 3) <= 0) &&
(memcmp(fixed_in, master_ver, 3) > 0) &&
(pred == NULL || (*pred)(param)))
{
if (!report)
return TRUE;
// a short message for SHOW SLAVE STATUS (message length constraints)
my_printf_error(ER_UNKNOWN_ERROR, "master may suffer from"
" http://bugs.mysql.com/bug.php?id=%u"
" so slave stops; check error log on slave"
" for more info", MYF(0), bug_id);
// a verbose message for the error log
rli->report(ERROR_LEVEL, ER_UNKNOWN_ERROR, NULL,
"According to the master's version ('%s'),"
" it is probable that master suffers from this bug:"
" http://bugs.mysql.com/bug.php?id=%u"
" and thus replicating the current binary log event"
" may make the slave's data become different from the"
" master's data."
" To take no risk, slave refuses to replicate"
" this event and stops."
" We recommend that all updates be stopped on the"
" master and slave, that the data of both be"
" manually synchronized,"
" that master's binary logs be deleted,"
" that master be upgraded to a version at least"
" equal to '%d.%d.%d'. Then replication can be"
" restarted.",
rli->relay_log.description_event_for_exec->server_version,
bug_id,
fixed_in[0], fixed_in[1], fixed_in[2]);
return TRUE;
}
}
return FALSE;
}
/**
BUG#33029, For all 5.0 up to 5.0.58 exclusive, and 5.1 up to 5.1.12
exclusive, if one statement in a SP generated AUTO_INCREMENT value
by the top statement, all statements after it would be considered
generated AUTO_INCREMENT value by the top statement, and a
erroneous INSERT_ID value might be associated with these statement,
which could cause duplicate entry error and stop the slave.
Detect buggy master to work around.
*/
bool rpl_master_erroneous_autoinc(THD *thd)
{
if (thd->rgi_slave)
{
DBUG_EXECUTE_IF("simulate_bug33029", return TRUE;);
return rpl_master_has_bug(thd->rgi_slave->rli, 33029, FALSE, NULL, NULL);
}
return FALSE;
}
/**
@} (end of group Replication)
*/
#endif /* HAVE_REPLICATION */
|