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CREATE TABLE t1 (a INT PRIMARY KEY, b TEXT) ENGINE=InnoDB;
CREATE TABLE t2 (a INT PRIMARY KEY) ENGINE=InnoDB;
CREATE TABLE t3 (a INT PRIMARY KEY, b TEXT, c TEXT) ENGINE=InnoDB;
INSERT INTO t1 VALUES (1,REPEAT('a',30000)),(2,REPEAT('b',40000));
SET DEBUG_SYNC='before_row_upd_extern SIGNAL have_latch WAIT_FOR go1';
BEGIN;
UPDATE t1 SET a=a+2;
ROLLBACK;
BEGIN;
UPDATE t1 SET b=CONCAT(b,'foo');
SET DEBUG_SYNC='now WAIT_FOR have_latch';
SELECT a, RIGHT(b,20) FROM t1;
SET DEBUG_SYNC='now SIGNAL go1';
a RIGHT(b,20)
1 aaaaaaaaaaaaaaaaaaaa
2 bbbbbbbbbbbbbbbbbbbb
SET DEBUG='+d,row_ins_extern_checkpoint';
SET DEBUG_SYNC='before_row_ins_extern_latch SIGNAL rec_not_blob WAIT_FOR crash';
ROLLBACK;
BEGIN;
INSERT INTO t1 VALUES (3,REPEAT('c',50000));
SET DEBUG_SYNC='now WAIT_FOR rec_not_blob';
SET SESSION TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
SELECT @@tx_isolation;
@@tx_isolation
READ-UNCOMMITTED
SELECT a, RIGHT(b,20) FROM t1;
a RIGHT(b,20)
1 aaaaaaaaaaaaaaaaaaaa
2 bbbbbbbbbbbbbbbbbbbb
SELECT a FROM t1;
a
1
2
3
SET DEBUG='+d,crash_commit_before';
INSERT INTO t2 VALUES (42);
ERROR HY000: Lost connection to MySQL server during query
ERROR HY000: Lost connection to MySQL server during query
CHECK TABLE t1;
Table Op Msg_type Msg_text
test.t1 check status OK
INSERT INTO t3 VALUES
(1,REPEAT('d',7000),REPEAT('e',100)),
(2,REPEAT('g',7000),REPEAT('h',100));
SET DEBUG_SYNC='before_row_upd_extern SIGNAL have_latch WAIT_FOR go';
UPDATE t3 SET c=REPEAT('f',3000) WHERE a=1;
SET DEBUG_SYNC='now WAIT_FOR have_latch';
SET SESSION TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
SELECT @@tx_isolation;
@@tx_isolation
READ-UNCOMMITTED
SELECT a, RIGHT(b,20), RIGHT(c,20) FROM t3;
SET DEBUG_SYNC='now SIGNAL go';
a RIGHT(b,20) RIGHT(c,20)
1 dddddddddddddddddddd ffffffffffffffffffff
2 gggggggggggggggggggg hhhhhhhhhhhhhhhhhhhh
CHECK TABLE t1,t2,t3;
Table Op Msg_type Msg_text
test.t1 check status OK
test.t2 check status OK
test.t3 check status OK
BEGIN;
INSERT INTO t2 VALUES (347);
SET DEBUG='+d,row_upd_extern_checkpoint';
SET DEBUG_SYNC='before_row_upd_extern SIGNAL have_latch WAIT_FOR crash';
UPDATE t3 SET c=REPEAT('i',3000) WHERE a=2;
SET DEBUG_SYNC='now WAIT_FOR have_latch';
SELECT info FROM information_schema.processlist
WHERE state = 'debug sync point: before_row_upd_extern';
info
UPDATE t3 SET c=REPEAT('i',3000) WHERE a=2
SET DEBUG='+d,crash_commit_before';
COMMIT;
ERROR HY000: Lost connection to MySQL server during query
ERROR HY000: Lost connection to MySQL server during query
CHECK TABLE t1,t2,t3;
Table Op Msg_type Msg_text
test.t1 check status OK
test.t2 check status OK
test.t3 check status OK
SELECT a, RIGHT(b,20), RIGHT(c,20) FROM t3;
a RIGHT(b,20) RIGHT(c,20)
1 dddddddddddddddddddd ffffffffffffffffffff
2 gggggggggggggggggggg hhhhhhhhhhhhhhhhhhhh
SELECT a FROM t3;
a
1
2
BEGIN;
INSERT INTO t2 VALUES (33101);
SET DEBUG='+d,row_upd_extern_checkpoint';
SET DEBUG_SYNC='after_row_upd_extern SIGNAL have_latch WAIT_FOR crash';
UPDATE t3 SET c=REPEAT('j',3000) WHERE a=2;
SET DEBUG_SYNC='now WAIT_FOR have_latch';
SELECT info FROM information_schema.processlist
WHERE state = 'debug sync point: after_row_upd_extern';
info
UPDATE t3 SET c=REPEAT('j',3000) WHERE a=2
SET DEBUG='+d,crash_commit_before';
COMMIT;
ERROR HY000: Lost connection to MySQL server during query
ERROR HY000: Lost connection to MySQL server during query
CHECK TABLE t1,t2,t3;
Table Op Msg_type Msg_text
test.t1 check status OK
test.t2 check status OK
test.t3 check status OK
SELECT a, RIGHT(b,20), RIGHT(c,20) FROM t3;
a RIGHT(b,20) RIGHT(c,20)
1 dddddddddddddddddddd ffffffffffffffffffff
2 gggggggggggggggggggg hhhhhhhhhhhhhhhhhhhh
SELECT a FROM t3;
a
1
2
SELECT * FROM t2;
a
DROP TABLE t1,t2,t3;
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