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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>
86 lines
2.5 KiB
Plaintext
86 lines
2.5 KiB
Plaintext
--source include/have_innodb.inc
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--source include/have_sequence.inc
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--source include/have_binlog_format_mixed.inc
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--source include/master-slave.inc
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--echo *** Testcase to show how a long-running SELECT can block replication from proceeding
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--echo *** past a DDL. Intention to implement a timeout after which such SELECT can be
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--echo *** 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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--sync_slave_with_master
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--source include/stop_slave.inc
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SELECT @@GLOBAL.slave_abort_blocking_timeout;
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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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SELECT @@GLOBAL.slave_abort_blocking_timeout;
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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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--connection server_2
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# Start a SELECT that will run for long.
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send 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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# Wait for the SELECT to have started so it will block the coming DDL
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# from replicating.
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--let $wait_condition= SELECT COUNT(*)=1 FROM INFORMATION_SCHEMA.PROCESSLIST WHERE state = 'User sleep'
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--source include/wait_condition.inc
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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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--save_master_pos
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--connection slave
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--source include/start_slave.inc
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--sync_with_master
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--connection server_2
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--error ER_QUERY_INTERRUPTED
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reap;
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--connection slave
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query_vertical SHOW CREATE TABLE t1;
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# Do it again to test that a timeout of 0 also works to abort user queries.
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--source 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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--connection server_2
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send 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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--let $wait_condition= SELECT COUNT(*)=1 FROM INFORMATION_SCHEMA.PROCESSLIST WHERE state = 'User sleep'
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--source include/wait_condition.inc
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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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--save_master_pos
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--connection slave
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--source include/start_slave.inc
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--sync_with_master
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--connection server_2
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--error ER_QUERY_INTERRUPTED
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reap;
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--connection slave
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query_vertical SHOW CREATE TABLE t1;
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--source include/stop_slave.inc
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SET GLOBAL slave_abort_blocking_timeout= @old_abort_timeout;
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--source include/start_slave.inc
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--connection master
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DROP TABLE t1;
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--source include/rpl_end.inc
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