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db5d1cde45
If a slave replicating an event has waited for more than @@slave_abort_blocking_timeout for a conflicting metadata lock held by a non-replication thread, the blocking query is killed to allow replication to proceed and not be blocked indefinitely by a user query. Reviewed-by: Monty <monty@mariadb.org> Signed-off-by: Kristian Nielsen <knielsen@knielsen-hq.org>
75 lines
2.3 KiB
Plaintext
75 lines
2.3 KiB
Plaintext
include/master-slave.inc
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[connection master]
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*** Testcase to show how a long-running SELECT can block replication from proceeding
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*** past a DDL. Intention to implement a timeout after which such SELECT can be
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*** killed.
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connection master;
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CREATE TABLE t1 (a INT PRIMARY KEY, b INT) ENGINE=InnoDB;
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INSERT INTO t1 SELECT seq, 100+seq FROM seq_1_to_20;
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connection slave;
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include/stop_slave.inc
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SELECT @@GLOBAL.slave_abort_blocking_timeout;
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@@GLOBAL.slave_abort_blocking_timeout
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31536000.000000
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SET @old_abort_timeout= @@slave_abort_blocking_timeout;
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SET GLOBAL slave_abort_blocking_timeout= -1;
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Warnings:
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Warning 1292 Truncated incorrect slave_abort_blocking_timeout value: '-1'
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SELECT @@GLOBAL.slave_abort_blocking_timeout;
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@@GLOBAL.slave_abort_blocking_timeout
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0.000000
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SET GLOBAL slave_abort_blocking_timeout= 1.0;
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SELECT @@GLOBAL.slave_abort_blocking_timeout;
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@@GLOBAL.slave_abort_blocking_timeout
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1.000000
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connection server_2;
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SELECT X.a, SLEEP(IF((X.b MOD 2)=0, 0.4, 0.6)) FROM t1 X CROSS JOIN t1 Y;
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connection slave;
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connection master;
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UPDATE t1 SET b=b+1000 WHERE a=1;
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ALTER TABLE t1 ADD INDEX b_idx(b);
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UPDATE t1 SET b=b+1000 WHERE a=20;
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connection slave;
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include/start_slave.inc
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connection server_2;
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ERROR 70100: Query execution was interrupted
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connection slave;
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SHOW CREATE TABLE t1;
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Table t1
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Create Table CREATE TABLE `t1` (
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`a` int(11) NOT NULL,
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`b` int(11) DEFAULT NULL,
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PRIMARY KEY (`a`),
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KEY `b_idx` (`b`)
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) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_uca1400_ai_ci
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include/stop_slave.inc
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SET GLOBAL slave_abort_blocking_timeout= 0;
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SELECT @@GLOBAL.slave_abort_blocking_timeout;
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@@GLOBAL.slave_abort_blocking_timeout
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0.000000
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connection server_2;
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SELECT X.a, SLEEP(IF((X.b MOD 2)=0, 0.4, 0.6)) FROM t1 X CROSS JOIN t1 Y;
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connection slave;
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connection master;
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UPDATE t1 SET b=b+1000 WHERE a=1;
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ALTER TABLE t1 DROP INDEX b_idx;
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UPDATE t1 SET b=b+1000 WHERE a=20;
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connection slave;
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include/start_slave.inc
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connection server_2;
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ERROR 70100: Query execution was interrupted
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connection slave;
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SHOW CREATE TABLE t1;
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Table t1
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Create Table CREATE TABLE `t1` (
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`a` int(11) NOT NULL,
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`b` int(11) DEFAULT NULL,
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PRIMARY KEY (`a`)
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) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_uca1400_ai_ci
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include/stop_slave.inc
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SET GLOBAL slave_abort_blocking_timeout= @old_abort_timeout;
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include/start_slave.inc
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connection master;
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DROP TABLE t1;
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include/rpl_end.inc
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