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In debug builds of MySQL, there is an configuration variable that allows an InnoDB log checkpoint to be initiated: SET GLOBAL innodb_log_checkpoint_now=ON; Setting this variable while a table-rebuilding ALTER TABLE is executing may result in an infinite loop. checkpoint_now_set(): Account for log_sys->append_on_checkpoint->size(). Note that this function contains race conditions, because it is accessing fields of log_sys without holding log_sys->mutex. We think that this is acceptable, because this variable only exists for debugging purposes, in debug builds of MySQL. RB: 9947 Reviewed-by: Sunny Bains <sunny.bains@oracle.com>
31 lines
746 B
Text
31 lines
746 B
Text
--source include/have_debug.inc
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--source include/have_debug_sync.inc
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--source include/have_innodb.inc
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--source include/count_sessions.inc
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CREATE TABLE t1 (x INT NOT NULL UNIQUE KEY) ENGINE=InnoDB;
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INSERT INTO t1 VALUES(5);
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SET GLOBAL innodb_log_checkpoint_now=TRUE;
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# Start an ALTER TABLE and stop it before renaming the files
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SET DEBUG_SYNC='commit_cache_rebuild SIGNAL ready WAIT_FOR finish';
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--send ALTER TABLE t1 ADD PRIMARY KEY(x)
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connect (con1,localhost,root,,);
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SET DEBUG_SYNC='now WAIT_FOR ready';
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SET GLOBAL innodb_log_checkpoint_now=TRUE;
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SET DEBUG_SYNC='now SIGNAL finish';
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disconnect con1;
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connection default;
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reap;
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SHOW CREATE TABLE t1;
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DROP TABLE t1;
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SET DEBUG_SYNC='RESET';
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--source include/wait_until_count_sessions.inc
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