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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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35
sql/handler.cc
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@@ -1978,6 +1978,41 @@ int ha_release_temporary_latches(THD *thd)
return 0;
}
/**
Check if all storage engines used in transaction agree that after
rollback to savepoint it is safe to release MDL locks acquired after
savepoint creation.
@param thd The client thread that executes the transaction.
@return true - It is safe to release MDL locks.
false - If it is not.
*/
bool ha_rollback_to_savepoint_can_release_mdl(THD *thd)
{
Ha_trx_info *ha_info;
THD_TRANS *trans= (thd->in_sub_stmt ? &thd->transaction.stmt :
&thd->transaction.all);
DBUG_ENTER("ha_rollback_to_savepoint_can_release_mdl");
/**
Checking whether it is safe to release metadata locks after rollback to
savepoint in all the storage engines that are part of the transaction.
*/
for (ha_info= trans->ha_list; ha_info; ha_info= ha_info->next())
{
handlerton *ht= ha_info->ht();
DBUG_ASSERT(ht);
if (ht->savepoint_rollback_can_release_mdl == 0 ||
ht->savepoint_rollback_can_release_mdl(ht, thd) == false)
DBUG_RETURN(false);
}
DBUG_RETURN(true);
}
int ha_rollback_to_savepoint(THD *thd, SAVEPOINT *sv)
{
int error=0;