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Part of MDEV-5336 Implement LOCK FOR BACKUP Originally both table metadata lock and global read lock protection were acquired before getting TABLE from table cache. This will be reordered in a future commit with MDL_BACKUP_XXX locks so that we first take table metadata lock, then get TABLE from table cache, then acquire analogue of global read lock. This patch both simplifies FLUSH TABLES code, makes FLUSH TABLES to lock less and also enables FLUSH TABLES code to be used with backup locks. The usage of FLUSH TABLES changes slightly: - FLUSH TABLES without any arguments will now only close not used tables and tables locked by the FLUSH TABLES connection. All not used table shares will be closed. Tables locked by the FLUSH TABLES connection will be reopened and re-locked after all others has stoped using the table (as before). If there was no locked tables, then FLUSH TABLES is instant and will not cause any waits. FLUSH TABLES will not wait for any in use table. - FLUSH TABLES with a table list, will ensure that the tables are closed before statement returns. The code is now only using MDL locks and not table share versions, which simplices the code greatly. One visible change is that the server will wait for the end of the transaction that are using the tables. Before FLUSH TABLES only waited for the statements to end. Signed-off-by: Monty <monty@mariadb.org>
108 lines
2.7 KiB
Text
108 lines
2.7 KiB
Text
#
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# Code coverage testing of TRUNCATE TABLE.
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#
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# Ingo Struewing, 2009-07-20
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#
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--source include/have_debug_sync.inc
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SET DEBUG_SYNC='RESET';
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--let $MYSQLD_DATADIR= `SELECT @@datadir`
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--disable_warnings
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DROP TABLE IF EXISTS t1;
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--enable_warnings
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--echo #
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--echo # Bug#20667 - Truncate table fails for a write locked table
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--echo #
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########
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# Attack acquire_exclusive_locks(). Hold a global read lock.
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# Non-LOCK TABLE case.
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#
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CREATE TABLE t1 (c1 INT);
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INSERT INTO t1 VALUES (1);
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#
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# Start a transaction and execute a DML in it. Since 5.4.4 this leaves
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# a shared meta data lock (MDL) behind. TRUNCATE shall block on it.
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#
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--connect (con1, localhost, root,,)
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START TRANSACTION;
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INSERT INTO t1 VALUES (2);
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#
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# Get connection id of default connection.
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# Start TRUNCATE, which will block on acquire_exclusive_locks().
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#
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--connection default
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let $ID= `SELECT @id := CONNECTION_ID()`;
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SET DEBUG_SYNC='mdl_acquire_lock_wait SIGNAL waiting';
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send TRUNCATE TABLE t1;
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#
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# Get the default connection ID into a variable in an invisible statement.
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# Kill the TRUNCATE query. This shall result in an error return
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# from wait_while_table_is_used().
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#
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--connection con1
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SET DEBUG_SYNC='now WAIT_FOR waiting';
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let $invisible_assignment_in_select = `SELECT @id := $ID`;
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KILL QUERY @id;
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--connection default
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--error ER_QUERY_INTERRUPTED
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reap;
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--connection con1
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--echo # Release SW lock by committing transaction.
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COMMIT;
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--disconnect con1
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--connection default
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UNLOCK TABLES;
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DROP TABLE t1;
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SET DEBUG_SYNC='RESET';
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--echo #
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--echo # Bug#57659 Segfault in Query_cache::invalidate_data for TRUNCATE TABLE
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--echo #
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--echo # Note that this test case only reproduces the problem
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--echo # when it is run with valgrind.
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--disable_warnings
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DROP TABLE IF EXISTS t1, m1;
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--enable_warnings
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CREATE TABLE t1(a INT) engine=memory;
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CREATE TABLE m1(a INT) engine=merge UNION(t1);
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connect(con2, localhost, root);
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connect(con1, localhost, root);
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SET DEBUG_SYNC= 'open_tables_after_open_and_process_table SIGNAL opened WAIT_FOR dropped';
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--echo # Sending:
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--send TRUNCATE TABLE m1
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connection con2;
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SET DEBUG_SYNC= 'now WAIT_FOR opened';
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--echo # Sending:
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--send FLUSH TABLES m1
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connection default;
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--echo # Waiting for FLUSH TABLES to be blocked.
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let $wait_condition= SELECT COUNT(*)=1 FROM information_schema.processlist
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WHERE state= 'Waiting for table metadata lock' AND info= 'FLUSH TABLES m1';
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--source include/wait_condition.inc
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SET DEBUG_SYNC= 'now SIGNAL dropped';
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connection con1;
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--echo # Reaping: TRUNCATE TABLE m1
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--error ER_WRONG_MRG_TABLE
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--reap
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disconnect con1;
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--source include/wait_until_disconnected.inc
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connection con2;
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--echo # Reaping: FLUSH TABLES
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--reap
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disconnect con2;
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--source include/wait_until_disconnected.inc
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connection default;
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SET DEBUG_SYNC= 'RESET';
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DROP TABLE m1, t1;
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