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Bug#21628087 innodb_log_checkpoint_now not fully compatible with WL#7142

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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>
This commit is contained in:
Marko Mäkelä
2015-08-17 13:44:52 +03:00
committed by Thirunarayanan Balathandayuthapani
parent be465cfb8c
commit 0ba299da02
2 changed files with 48 additions and 0 deletions
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mysql-test/suite/innodb/r/alter_rename_files.result Normal file
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CREATE TABLE t1 (x INT NOT NULL UNIQUE KEY) ENGINE=InnoDB;
INSERT INTO t1 VALUES(5);
SET GLOBAL innodb_log_checkpoint_now=TRUE;
SET DEBUG_SYNC='commit_cache_rebuild SIGNAL ready WAIT_FOR finish';
ALTER TABLE t1 ADD PRIMARY KEY(x);
SET DEBUG_SYNC='now WAIT_FOR ready';
SET GLOBAL innodb_log_checkpoint_now=TRUE;
SET DEBUG_SYNC='now SIGNAL finish';
SHOW CREATE TABLE t1;
Table Create Table
t1 CREATE TABLE `t1` (
`x` int(11) NOT NULL,
PRIMARY KEY (`x`),
UNIQUE KEY `x` (`x`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
DROP TABLE t1;
SET DEBUG_SYNC='RESET';