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sporadically". Races in truncate_coverage.test have caused its sporadical failures. In the test case we have tried to kill truncate statement being executed in the first connection which was waiting for X metadata lock on table being locked by the second connection. Since we have released metadata lock held by the second connection right after issuing KILL statement sometimes TRUNCATE TABLE managed to acquire X lock before it has noticed that it was killed. In this case TRUNCATE TABLE was successfully executed till its end and this fact has caused test failure since this statement didn't return expected error in such case. This patch addresses the problem by not releasing metadata locks in the second connections prematurely.
174 lines
4.2 KiB
Text
174 lines
4.2 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 wait_while_table_is_used(). Kill query while trying to
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# upgrade MDL.
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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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# Acquire a shared metadata lock on table by opening HANDLER for it and wait.
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# TRUNCATE shall block on this metadata lock.
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# We can't use normal DML as such statements would also block LOCK TABLES.
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#
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--echo #
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--echo # connection con1
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--connect (con1, localhost, root,,)
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HANDLER t1 OPEN;
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#
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# Get connection id of default connection.
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# Lock the table and start TRUNCATE, which will block on MDL upgrade.
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#
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--echo #
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--echo # connection default
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--connection default
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let $ID= `SELECT @id := CONNECTION_ID()`;
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LOCK TABLE t1 WRITE;
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SET DEBUG_SYNC='mdl_upgrade_shared_lock_to_exclusive 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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--echo #
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--echo # connection con2
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--connect (con2, localhost, root,,)
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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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--disconnect con2
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--echo #
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--echo # connection default
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--connection default
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--error ER_QUERY_INTERRUPTED
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reap;
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UNLOCK TABLES;
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--echo #
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--echo # connection con1
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--connection con1
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--echo # Release shared metadata lock by closing HANDLER.
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HANDLER t1 CLOSE;
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--disconnect con1
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--echo #
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--echo # connection default
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--connection default
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DROP TABLE t1;
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SET DEBUG_SYNC='RESET';
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########
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# Attack reopen_tables(). Remove form file.
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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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# Acquire a shared metadata lock on table by opening HANDLER for it and wait.
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# TRUNCATE shall block on this metadata lock.
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# We can't use normal DML as such statements would also block LOCK TABLES.
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#
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--echo #
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--echo # connection con1
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--connect (con1, localhost, root,,)
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HANDLER t1 OPEN;
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#
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# Lock the table and start TRUNCATE, which will block on MDL upgrade.
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#
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--echo #
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--echo # connection default
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--connection default
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LOCK TABLE t1 WRITE;
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SET DEBUG_SYNC='mdl_upgrade_shared_lock_to_exclusive SIGNAL waiting';
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send TRUNCATE TABLE t1;
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#
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# Remove datafile.
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# Commit to let TRUNCATE continue.
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#
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--echo #
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--echo # connection con2
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--connect (con2, localhost, root,,)
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SET DEBUG_SYNC='now WAIT_FOR waiting';
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--remove_file $MYSQLD_DATADIR/test/t1.frm
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--disconnect con2
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--echo #
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--echo # connection con1
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--connection con1
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HANDLER t1 CLOSE;
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--disconnect con1
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--echo #
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--echo # connection default
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--connection default
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--error ER_NO_SUCH_TABLE
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reap;
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UNLOCK TABLES;
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--error ER_BAD_TABLE_ERROR
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DROP TABLE t1;
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SET DEBUG_SYNC='RESET';
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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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--echo #
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--echo # connection con1
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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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--echo #
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--echo # connection default
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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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--echo #
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--echo # connection con1
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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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--echo #
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--echo # connection default
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--connection default
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--error ER_QUERY_INTERRUPTED
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reap;
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--echo #
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--echo # connection con1
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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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--echo #
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--echo # connection default
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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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