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
|
#
# Testing which locks we get from all stages
#
InnoDB 0 transactions not purged
BACKUP STAGE START;
SELECT LOCK_MODE, LOCK_TYPE, TABLE_SCHEMA, TABLE_NAME FROM information_schema.metadata_lock_info
WHERE TABLE_NAME NOT LIKE 'innodb_%_stats';
LOCK_MODE LOCK_TYPE TABLE_SCHEMA TABLE_NAME
MDL_BACKUP_START Backup lock
BACKUP STAGE FLUSH;
SELECT LOCK_MODE, LOCK_TYPE, TABLE_SCHEMA, TABLE_NAME FROM information_schema.metadata_lock_info
WHERE TABLE_NAME NOT LIKE 'innodb_%_stats';
LOCK_MODE LOCK_TYPE TABLE_SCHEMA TABLE_NAME
MDL_BACKUP_FLUSH Backup lock
BACKUP STAGE BLOCK_DDL;
SELECT LOCK_MODE, LOCK_TYPE, TABLE_SCHEMA, TABLE_NAME FROM information_schema.metadata_lock_info
WHERE TABLE_NAME NOT LIKE 'innodb_%_stats';
LOCK_MODE LOCK_TYPE TABLE_SCHEMA TABLE_NAME
MDL_BACKUP_WAIT_DDL Backup lock
BACKUP STAGE BLOCK_COMMIT;
SELECT LOCK_MODE, LOCK_TYPE, TABLE_SCHEMA, TABLE_NAME FROM information_schema.metadata_lock_info
WHERE TABLE_NAME NOT LIKE 'innodb_%_stats';
LOCK_MODE LOCK_TYPE TABLE_SCHEMA TABLE_NAME
MDL_BACKUP_WAIT_COMMIT Backup lock
BACKUP STAGE END;
SELECT LOCK_MODE, LOCK_TYPE, TABLE_SCHEMA, TABLE_NAME FROM information_schema.metadata_lock_info
WHERE TABLE_NAME NOT LIKE 'innodb_%_stats';
LOCK_MODE LOCK_TYPE TABLE_SCHEMA TABLE_NAME
#
# testing BACKUP STAGE LOCK's
#
connect con1,localhost,root,,;
connect con2,localhost,root,,;
connection default;
#
# testing if BACKUP STAGE FLUSH causes deadlocks with ALTER TABLE
#
create table t1 (a int) stats_persistent= 0, engine=innodb;
InnoDB 0 transactions not purged
connection con2;
backup stage start;
connection default;
start transaction;
insert into t1 values (1);
connection con1;
alter table t1 add column (j int), algorithm copy, lock shared;
connection con2;
backup stage flush;
SELECT LOCK_MODE, LOCK_TYPE, TABLE_SCHEMA, TABLE_NAME FROM information_schema.metadata_lock_info
WHERE TABLE_NAME NOT LIKE 'innodb_%_stats';
LOCK_MODE LOCK_TYPE TABLE_SCHEMA TABLE_NAME
MDL_BACKUP_DDL Backup lock
MDL_BACKUP_FLUSH Backup lock
MDL_SHARED_WRITE Table metadata lock test t1
MDL_SHARED_UPGRADABLE Table metadata lock test t1
MDL_INTENTION_EXCLUSIVE Schema metadata lock test
SET STATEMENT max_statement_time=1 FOR backup stage block_ddl;
ERROR 70100: Query execution was interrupted (max_statement_time exceeded)
backup stage block_ddl;
connection default;
commit;
SELECT * FROM t1;
a
1
SET STATEMENT lock_wait_timeout=0 FOR INSERT INTO t1 values (2);
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
INSERT INTO t1 values (2,0);;
connection con2;
backup stage end;
connection con1;
connection default;
select * from t1;
a j
1 NULL
2 0
drop table t1;
# Test with inline alter table, which doesn't block block_commit
create table t1 (a int) engine=innodb;
start transaction;
insert into t1 values (1);
connection con1;
alter table t1 add column (j int);
connection con2;
backup stage start;
backup stage flush;
SELECT LOCK_MODE, LOCK_TYPE, TABLE_SCHEMA, TABLE_NAME FROM information_schema.metadata_lock_info
WHERE TABLE_NAME NOT LIKE 'innodb_%_stats';
LOCK_MODE LOCK_TYPE TABLE_SCHEMA TABLE_NAME
MDL_BACKUP_ALTER_COPY Backup lock
MDL_BACKUP_FLUSH Backup lock
MDL_SHARED_WRITE Table metadata lock test t1
MDL_SHARED_UPGRADABLE Table metadata lock test t1
MDL_INTENTION_EXCLUSIVE Schema metadata lock test
backup stage block_ddl;
backup stage block_commit;
connection default;
SELECT * FROM t1;
a
1
commit;
connection con2;
backup stage end;
connection con1;
connection default;
drop table t1;
#
# testing if BACKUP STAGE FLUSH causes deadlocks with DROP TABLE
#
create table t1 (a int)stats_persistent=0, engine=innodb;
InnoDB 0 transactions not purged
start transaction;
insert into t1 values (1);
connection con1;
SET STATEMENT lock_wait_timeout=0 FOR DROP TABLE t1;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
DROP TABLE t1;
connection con2;
backup stage start;
backup stage flush;
SET STATEMENT lock_wait_timeout=0 FOR SELECT * FROM t1;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
backup stage block_ddl;
SELECT LOCK_MODE, LOCK_TYPE, TABLE_SCHEMA, TABLE_NAME FROM information_schema.metadata_lock_info
WHERE TABLE_NAME NOT LIKE 'innodb_%_stats';
LOCK_MODE LOCK_TYPE TABLE_SCHEMA TABLE_NAME
MDL_BACKUP_WAIT_DDL Backup lock
MDL_SHARED_WRITE Table metadata lock test t1
MDL_INTENTION_EXCLUSIVE Schema metadata lock test
backup stage end;
connection default;
commit;
connection con1;
connection default;
#
# Check if backup stage block_dll + concurrent drop table blocks select
#
create table t1 (a int) engine=innodb;
InnoDB 0 transactions not purged
backup stage start;
backup stage block_ddl;
connection con1;
DROP TABLE t1;
connection con2;
connection con2;
SELECT LOCK_MODE, LOCK_TYPE, TABLE_SCHEMA, TABLE_NAME FROM information_schema.metadata_lock_info
WHERE TABLE_NAME NOT LIKE 'innodb_%_stats';
LOCK_MODE LOCK_TYPE TABLE_SCHEMA TABLE_NAME
MDL_BACKUP_WAIT_DDL Backup lock
SELECT * FROM t1;
a
connection default;
backup stage end;
connection con1;
connection default;
#
# Check if backup stage block_dll overrides ddl lock for drop table
#
create table t1 (a int) engine=innodb;
start transaction;
insert into t1 values (1);
connection con1;
SET STATEMENT lock_wait_timeout=0 FOR DROP TABLE t1;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
DROP TABLE t1;
connection con2;
backup stage start;
backup stage flush;
backup stage block_ddl;
connection default;
commit;
connection con2;
backup stage end;
connection con1;
connection default;
#
# Check if BACKUP STAGE BLOCK_COMMIT blocks commit
#
create table t1 (a int) engine=innodb;
start transaction;
insert into t1 values (1);
connection con1;
backup stage start;
backup stage block_commit;
connection default;
commit;
connection con1;
backup stage end;
connection default;
select * from t1;
a
1
drop table t1;
#
# Check if BACKUP STAGE BLOCK_DDL blocks create view
#
create table t1 (a int) engine=innodb;
connection con1;
backup stage start;
backup stage block_ddl;
connection default;
create view v1 as select * from t1;;
connection con1;
select count(*) = 1 from information_schema.processlist;
count(*) = 1
0
backup stage end;
connection default;
drop table t1;
drop view v1;
disconnect con1;
disconnect con2;
#
# Test backup stage and flush tables
#
BACKUP STAGE START ;
BACKUP STAGE BLOCK_DDL ;
FLUSH TABLES;
CREATE TEMPORARY TABLE t12345678_tmp (col1 INT);
drop table t12345678_tmp;
BACKUP STAGE END;
#
# Test BACKUP STAGES with lock timeouts
#
SET GLOBAL lock_wait_timeout=0;
CREATE TABLE t_permanent_innodb (col1 INT) ENGINE = InnoDB;
CREATE TABLE t_permanent_myisam (col1 INT) ENGINE = MyISAM;
CREATE TABLE t_permanent_aria (col1 INT) ENGINE = Aria transactional=1;
CREATE TABLE t_permanent_aria2 (col1 INT) ENGINE = Aria transactional=0;
INSERT INTO t_permanent_innodb SET col1 = 1;
INSERT INTO t_permanent_myisam SET col1 = 1;
INSERT INTO t_permanent_aria SET col1 = 1;
INSERT INTO t_permanent_aria2 SET col1 = 1;
CREATE TABLE t_con1_innodb (col1 INT) ENGINE = InnoDB;
CREATE TABLE t_con1_myisam (col1 INT) ENGINE = MyISAM;
connect con1,localhost,root,,;
connection default;
BACKUP STAGE START;
BACKUP STAGE FLUSH;
BACKUP STAGE BLOCK_DDL;
BACKUP STAGE BLOCK_COMMIT;
connection con1;
SET AUTOCOMMIT = 1;
UPDATE t_permanent_aria SET col1 = 1;
UPDATE t_permanent_innodb SET col1 = 1;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
UPDATE t_permanent_innodb SET col1 = 8;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
UPDATE t_permanent_myisam SET col1 = 8;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
UPDATE t_permanent_aria SET col1 = 8;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
UPDATE t_permanent_aria2 SET col1 = 8;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
select * from t_permanent_innodb;
col1
1
select * from t_permanent_myisam;
col1
1
select * from t_permanent_aria;
col1
8
select * from t_permanent_aria2;
col1
1
SET AUTOCOMMIT = 0;
UPDATE t_permanent_innodb SET col1 = 9;
UPDATE t_permanent_aria SET col1 = 9;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
UPDATE t_permanent_myisam SET col1 = 9;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
UPDATE t_permanent_aria2 SET col1 = 9;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
DROP TABLE t_con1_innodb;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
DROP TABLE t_con1_myisam;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
connection default;
BACKUP STAGE END;
select * from t_permanent_innodb;
col1
1
select * from t_permanent_myisam;
col1
1
select * from t_permanent_aria;
col1
9
select * from t_permanent_aria2;
col1
1
DROP TABLE t_permanent_myisam, t_permanent_innodb, t_permanent_aria, t_permanent_aria2;
DROP TABLE t_con1_innodb, t_con1_myisam;
disconnect con1;
set global lock_wait_timeout=default;
|
