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merge MySQL-5.6 bugfix "Bug#17862905: MYSQLDUMP CREATES USELESS METADATA LOCKS"

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revno: 5716
committer: Praveenkumar Hulakund <praveenkumar.hulakund@oracle.com>
branch nick: mysql_5_6
timestamp: Sat 2013-12-28 22:08:40 +0530
message:
  Bug#17862905: MYSQLDUMP CREATES USELESS METADATA LOCKS
This commit is contained in:
Sergei Golubchik
2014-05-05 23:53:31 +02:00
parent f90dca1a0d
commit 3792693f31
6 changed files with 192 additions and 27 deletions
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8
sql/handler.h
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@ -1025,6 +1025,13 @@ struct handlerton
to the savepoint_set call
*/
int (*savepoint_rollback)(handlerton *hton, THD *thd, void *sv);
/**
Check if storage engine allows to release metadata locks which were
acquired after the savepoint if rollback to savepoint is done.
@return true - If it is safe to release MDL locks.
false - If it is not.
*/
bool (*savepoint_rollback_can_release_mdl)(handlerton *hton, THD *thd);
int (*savepoint_release)(handlerton *hton, THD *thd, void *sv);
/*
'all' is true if it's a real commit, that makes persistent changes
@ -4046,6 +4053,7 @@ int ha_enable_transaction(THD *thd, bool on);
/* savepoints */
int ha_rollback_to_savepoint(THD *thd, SAVEPOINT *sv);
bool ha_rollback_to_savepoint_can_release_mdl(THD *thd);
int ha_savepoint(THD *thd, SAVEPOINT *sv);
int ha_release_savepoint(THD *thd, SAVEPOINT *sv);