include/master-slave.inc
[connection master]
*** Testcase to show how a long-running SELECT can block replication from proceeding
*** past a DDL. Intention to implement a timeout after which such SELECT can be
*** killed.
connection master;
CREATE TABLE t1 (a INT PRIMARY KEY, b INT) ENGINE=InnoDB;
INSERT INTO t1 SELECT seq, 100+seq FROM seq_1_to_20;
connection slave;
include/stop_slave.inc
SELECT @@GLOBAL.slave_abort_blocking_timeout;
@@GLOBAL.slave_abort_blocking_timeout
31536000.000000
SET @old_abort_timeout= @@slave_abort_blocking_timeout;
SET GLOBAL slave_abort_blocking_timeout= -1;
Warnings:
Warning	1292	Truncated incorrect slave_abort_blocking_timeout value: '-1'
SELECT @@GLOBAL.slave_abort_blocking_timeout;
@@GLOBAL.slave_abort_blocking_timeout
0.000000
SET GLOBAL slave_abort_blocking_timeout= 1.0;
SELECT @@GLOBAL.slave_abort_blocking_timeout;
@@GLOBAL.slave_abort_blocking_timeout
1.000000
connection server_2;
SELECT X.a, SLEEP(IF((X.b MOD 2)=0, 0.4, 0.6)) FROM t1 X CROSS JOIN t1 Y;
connection slave;
connection master;
UPDATE t1 SET b=b+1000 WHERE a=1;
ALTER TABLE t1 ADD INDEX b_idx(b);
UPDATE t1 SET b=b+1000 WHERE a=20;
connection slave;
include/start_slave.inc
connection server_2;
ERROR 70100: Query execution was interrupted
connection slave;
SHOW CREATE TABLE t1;
Table	t1
Create Table	CREATE TABLE `t1` (
  `a` int(11) NOT NULL,
  `b` int(11) DEFAULT NULL,
  PRIMARY KEY (`a`),
  KEY `b_idx` (`b`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_uca1400_ai_ci
include/stop_slave.inc
SET GLOBAL slave_abort_blocking_timeout= 0;
SELECT @@GLOBAL.slave_abort_blocking_timeout;
@@GLOBAL.slave_abort_blocking_timeout
0.000000
connection server_2;
SELECT X.a, SLEEP(IF((X.b MOD 2)=0, 0.4, 0.6)) FROM t1 X CROSS JOIN t1 Y;
connection slave;
connection master;
UPDATE t1 SET b=b+1000 WHERE a=1;
ALTER TABLE t1 DROP INDEX b_idx;
UPDATE t1 SET b=b+1000 WHERE a=20;
connection slave;
include/start_slave.inc
connection server_2;
ERROR 70100: Query execution was interrupted
connection slave;
SHOW CREATE TABLE t1;
Table	t1
Create Table	CREATE TABLE `t1` (
  `a` int(11) NOT NULL,
  `b` int(11) DEFAULT NULL,
  PRIMARY KEY (`a`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_uca1400_ai_ci
include/stop_slave.inc
SET GLOBAL slave_abort_blocking_timeout= @old_abort_timeout;
include/start_slave.inc
connection master;
DROP TABLE t1;
include/rpl_end.inc