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The failure happens due to a race condition between processing a row event (INSERT) and an automatically generated event DROP TEMPORARY TABLE. Even though DROP has a higher GTID, it can become visible in @@gtid_slave_pos before the row event with a lower GTID has been committed. Since the test makes the slave to synchronize with the master using GTID, the waiting stops as soon as GTID of the DROP TEMPORARY TABLE becomes visible, and if changes from the previous event haven't been applied yet, the error occurs. According to Kristian (see the comment to MDEV-10631), the real problem is that DROP TEMPORARY TABLE is logged in the row mode at all. For this particular test, since DROP does not do anything, nothing prevents it from competing with the prior transaction. The workaround for the test is to add a meaningful event after DROP TEMPORARY TABLE, so that the slave would wait on its GTID instead of the one from DROP. Additionally (unrelated to this problem) removed FLUSH TABLES, which, as the comment stated, should have been removed after MDEV-6403 was fixed.
70 lines
2 KiB
Text
70 lines
2 KiB
Text
--source include/have_innodb.inc
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--source include/master-slave.inc
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--connection master
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ALTER TABLE mysql.gtid_slave_pos ENGINE = InnoDB;
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CREATE TABLE t1 (a INT PRIMARY KEY, b INT) Engine=InnoDB;
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--sync_slave_with_master
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--connection slave
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--source include/stop_slave.inc
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# Provoke a duplicate key error on replication.
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SET sql_log_bin= 0;
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INSERT INTO t1 VALUES (1, 2);
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SET sql_log_bin= 1;
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CHANGE MASTER TO master_use_gtid= current_pos;
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--echo Contents on slave before:
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SELECT * FROM t1 ORDER BY a;
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SET @old_parallel= @@GLOBAL.slave_parallel_threads;
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SET GLOBAL slave_parallel_threads=8;
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--connection master
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CREATE TEMPORARY TABLE t2 LIKE t1;
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INSERT INTO t2 VALUE (1, 1);
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INSERT INTO t2 VALUE (2, 1);
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INSERT INTO t2 VALUE (3, 1);
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INSERT INTO t2 VALUE (4, 1);
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INSERT INTO t2 VALUE (5, 1);
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INSERT INTO t1 SELECT * FROM t2;
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DROP TEMPORARY TABLE t2;
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INSERT INTO t1 VALUE (6, 3);
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--source include/save_master_gtid.inc
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--echo Contents on master:
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SELECT * FROM t1 ORDER BY a;
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--connection slave
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START SLAVE;
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# The slave will stop with a duplicate key error.
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# The bug was 1) that the next DROP TEMPORARY TABLE would be allowed to run
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# anyway, and 2) that then record_gtid() would get an error during commit
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# (since the prior commit failed), and this error was not correctly handled,
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# which caused an assertion about closing tables while a statement was still
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# active.
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--let $slave_sql_errno=1062
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--source include/wait_for_slave_sql_error.inc
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STOP SLAVE IO_THREAD;
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--echo Contents on slave on slave error:
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SELECT * FROM t1 ORDER BY a;
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# Resolve the duplicate key error so replication can be resumed.
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SET sql_log_bin= 0;
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DELETE FROM t1 WHERE a=1;
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SET sql_log_bin= 1;
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--source include/start_slave.inc
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--source include/sync_with_master_gtid.inc
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--echo Contents on slave after:
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SELECT * FROM t1 ORDER BY a;
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--connection master
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DROP TABLE t1;
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--connection slave
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--source include/stop_slave.inc
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SET GLOBAL slave_parallel_threads= @old_parallel;
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--source include/start_slave.inc
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--source include/rpl_end.inc
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