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Bug#21074 Large query_cache freezes mysql server sporadically under heavy load

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Invaldating a subset of a sufficiently large query cache can take a long time.
During this time the server is efficiently frozen and no other operation can
be executed. This patch addresses this problem by moving the locks which cause
the freezing and also by temporarily disable the query cache while the 
invalidation takes place.
This commit is contained in:
thek@adventure.(none)
2007-07-02 19:14:48 +02:00
parent 6044940b25
commit 863e882785
10 changed files with 677 additions and 372 deletions
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16
sql/sql_rename.cc
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@@ -144,10 +144,14 @@ bool mysql_rename_tables(THD *thd, TABLE_LIST *table_list, bool silent)
}
}
VOID(pthread_mutex_lock(&LOCK_open));
if (lock_table_names(thd, table_list))
pthread_mutex_lock(&LOCK_open);
if (lock_table_names_exclusively(thd, table_list))
{
pthread_mutex_unlock(&LOCK_open);
goto err;
}
pthread_mutex_unlock(&LOCK_open);
error=0;
if ((ren_table=rename_tables(thd,table_list,0)))
{
@@ -183,10 +187,14 @@ bool mysql_rename_tables(THD *thd, TABLE_LIST *table_list, bool silent)
send_ok(thd);
}
if (!error)
query_cache_invalidate3(thd, table_list, 0);
pthread_mutex_lock(&LOCK_open);
unlock_table_names(thd, table_list, (TABLE_LIST*) 0);
pthread_mutex_unlock(&LOCK_open);
err:
pthread_mutex_unlock(&LOCK_open);
/* enable logging back if needed */
if (disable_logs)
{