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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.
61 lines
1.3 KiB
Plaintext
61 lines
1.3 KiB
Plaintext
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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include/stop_slave.inc
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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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Contents on slave before:
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SELECT * FROM t1 ORDER BY a;
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a b
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1 2
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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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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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include/save_master_gtid.inc
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Contents on master:
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SELECT * FROM t1 ORDER BY a;
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a b
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1 1
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2 1
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3 1
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4 1
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5 1
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6 3
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START SLAVE;
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include/wait_for_slave_sql_error.inc [errno=1062]
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STOP SLAVE IO_THREAD;
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Contents on slave on slave error:
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SELECT * FROM t1 ORDER BY a;
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a b
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1 2
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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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include/start_slave.inc
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include/sync_with_master_gtid.inc
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Contents on slave after:
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SELECT * FROM t1 ORDER BY a;
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a b
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1 1
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2 1
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3 1
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4 1
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5 1
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6 3
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DROP TABLE t1;
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include/stop_slave.inc
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SET GLOBAL slave_parallel_threads= @old_parallel;
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include/start_slave.inc
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include/rpl_end.inc
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