database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-12-24 11:21:21 +03:00
Code Activity

Fix for bug #25044 "ALTER TABLE ... ENABLE KEYS acquires global 'opening

Browse Source 
tables' lock."

Execution of ALTER TABLE ... ENABLE KEYS on a table (which can take rather
long time) prevented concurrent execution of all statements using tables.

The problem was caused by the fact that we were holding LOCK_open mutex
during whole duration of this statement and particularly during call
to handler::enable_indexes(). This behavior was introduced as part of the
fix for bug 14262 "SP: DROP PROCEDURE|VIEW (maybe more) write to binlog
too late (race cond)"

The patch simply restores old behavior. Note that we can safely do this as
this operation takes exclusive lock (similar to name-lock) which blocks both
DML and DDL on the table being altered.

It also introduces mysql-test/include/wait_show_pattern.inc helper script
which is used to make test-case for this bug robust enough.
This commit is contained in:
dlenev@mockturtle.local
2007-01-19 23:15:59 +03:00
parent 82b03f29ac
commit 7b1a94ef78
5 changed files with 162 additions and 39 deletions
Download Patch File Download Diff File Expand all files Collapse all files

25
sql/sql_table.cc
View File

@@ -3146,19 +3146,30 @@ view_err:
if (!(alter_info->flags & ~(ALTER_RENAME | ALTER_KEYS_ONOFF)) &&
!table->s->tmp_table) // no need to touch frm
{
VOID(pthread_mutex_lock(&LOCK_open));
switch (alter_info->keys_onoff) {
case LEAVE_AS_IS:
error= 0;
break;
case ENABLE:
/*
wait_while_table_is_used() ensures that table being altered is
opened only by this thread and that TABLE::TABLE_SHARE::version
of TABLE object corresponding to this table is 0.
The latter guarantees that no DML statement will open this table
until ALTER TABLE finishes (i.e. until close_thread_tables())
while the fact that the table is still open gives us protection
from concurrent DDL statements.
*/
VOID(pthread_mutex_lock(&LOCK_open));
wait_while_table_is_used(thd, table, HA_EXTRA_FORCE_REOPEN);
VOID(pthread_mutex_unlock(&LOCK_open));
error= table->file->enable_indexes(HA_KEY_SWITCH_NONUNIQ_SAVE);
/* COND_refresh will be signaled in close_thread_tables() */
break;
case DISABLE:
VOID(pthread_mutex_lock(&LOCK_open));
wait_while_table_is_used(thd, table, HA_EXTRA_FORCE_REOPEN);
VOID(pthread_mutex_unlock(&LOCK_open));
error=table->file->disable_indexes(HA_KEY_SWITCH_NONUNIQ_SAVE);
/* COND_refresh will be signaled in close_thread_tables() */
break;
@@ -3171,6 +3182,16 @@ view_err:
error= 0;
}
VOID(pthread_mutex_lock(&LOCK_open));
/*
Unlike to the above case close_cached_table() below will remove ALL
instances of TABLE from table cache (it will also remove table lock
held by this thread). So to make actual table renaming and writing
to binlog atomic we have to put them into the same critical section
protected by LOCK_open mutex. This also removes gap for races between
access() and mysql_rename_table() calls.
*/
if (!error && (new_name != table_name || new_db != db))
{
thd->proc_info="rename";