83 lines
3.0 KiB
Plaintext
83 lines
3.0 KiB
Plaintext
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#
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# Test of MERGE tables with multisession and many waits.
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#
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# This test takes rather long time so let us run it only in --big-test mode
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--source include/big_test.inc
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# We use some debug-only features in this test
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--source include/have_debug.inc
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# We use INFORMATION_SCHEMA.PROCESSLIST in this test
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--source include/not_embedded.inc
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--disable_warnings
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drop table if exists t1,t2,t3,t4,t5,t6;
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--enable_warnings
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--echo #
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--echo # Bug#26379 - Combination of FLUSH TABLE and REPAIR TABLE
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--echo # corrupts a MERGE table
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--echo # Problem #3
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--echo #
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# Two FLUSH TABLES within a LOCK TABLES segment could invalidate the lock.
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# This did *not* require a MERGE table.
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#
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# To increase reproducibility it was necessary to enter a sleep of 2
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# seconds at the end of wait_for_tables() after unlock of LOCK_open. In
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# 5.0 and 5.1 the sleep must be inserted in open_and_lock_tables() after
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# open_tables() instead. wait_for_tables() is not used in this case. The
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# problem was that FLUSH TABLES releases LOCK_open while having unlocked
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# and closed all tables. When this happened while a thread was in the
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# loop in mysql_lock_tables() right after wait_for_tables()
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# (open_tables()) and before retrying to lock, the thread got the lock.
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# And it did not notice that the table needed a refresh after the
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# [re-]open. So it executed its statement on the table.
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#
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# The first FLUSH TABLES kicked the INSERT out of thr_multi_lock() and
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# let it wait in wait_for_tables() (open_table()). The second FLUSH
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# TABLES must happen while the INSERT was on its way from
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# wait_for_tables() (open_table()) to the next call of thr_multi_lock().
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# This needed to be supported by a sleep to make it repeatable.
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#
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CREATE TABLE t1 (c1 INT) ENGINE= MyISAM;
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LOCK TABLE t1 WRITE;
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#SELECT NOW();
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--echo # connection con1
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connect (con1,localhost,root,,);
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let $con1_id= `SELECT CONNECTION_ID()`;
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SET SESSION debug="+d,sleep_open_and_lock_after_open";
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send INSERT INTO t1 VALUES (1);
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--echo # connection default
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connection default;
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--echo # Let INSERT go into thr_multi_lock().
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#--sleep 8
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#SELECT ID,STATE,INFO FROM INFORMATION_SCHEMA.PROCESSLIST;
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let $wait_condition= SELECT 1 FROM INFORMATION_SCHEMA.PROCESSLIST
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WHERE ID = $con1_id AND STATE = 'Locked';
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--source include/wait_condition.inc
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#SELECT NOW();
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--echo # Kick INSERT out of thr_multi_lock().
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FLUSH TABLES;
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#SELECT NOW();
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--echo # Let INSERT go through open_tables() where it sleeps.
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#--sleep 8
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#SELECT ID,STATE,INFO FROM INFORMATION_SCHEMA.PROCESSLIST;
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let $wait_condition= SELECT 1 FROM INFORMATION_SCHEMA.PROCESSLIST
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WHERE ID = $con1_id AND STATE = 'Waiting for table';
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--source include/wait_condition.inc
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#SELECT NOW();
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--echo # Unlock and close table and wait for con1 to close too.
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FLUSH TABLES;
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#SELECT NOW();
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--echo # This should give no result.
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SELECT * FROM t1;
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#SELECT NOW();
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UNLOCK TABLES;
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--echo # connection con1
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connection con1;
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reap;
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SET SESSION debug="-d,sleep_open_and_lock_after_open";
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disconnect con1;
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--echo # connection default
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connection default;
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DROP TABLE t1;
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