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Remove one of the major sources of race condiitons in mariadb-test. Normally, mariadb_close() sends COM_QUIT to the server and immediately disconnects. In mariadb-test it means the test can switch to another connection and sends queries to the server before the server even started parsing the COM_QUIT packet and these queries can see the connection as fully active, as it didn't reach dispatch_command yet. This is a major source of instability in tests and many - but not all, still less than a half - tests employ workarounds. The correct one is a pair count_sessions.inc/wait_until_count_sessions.inc. Also very popular was wait_until_disconnected.inc, which was completely useless, because it verifies that the connection is closed, and after disconnect it always is, it didn't verify whether the server processed COM_QUIT. Sadly the placebo was as widely used as the real thing. Let's fix this by making mariadb-test `disconnect` command _to wait_ for the server to confirm. This makes almost all workarounds redundant. In some cases count_sessions.inc/wait_until_count_sessions.inc is still needed, though, as only `disconnect` command is changed: * after external tools, like `exec $MYSQL` * after failed `connect` command * replication, after `STOP SLAVE` * Federated/CONNECT/SPIDER/etc after `DROP TABLE` and also in some XA tests, because an XA transaction is dissociated from the THD very late, after the server has closed the client connection. Collateral cleanups: fix comments, remove some redundant statements: * DROP IF EXISTS if nothing is known to exist * DROP table/view before DROP DATABASE * REVOKE privileges before DROP USER etc
25 lines
652 B
Text
25 lines
652 B
Text
--source include/have_innodb.inc
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--source include/have_debug.inc
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--source include/have_debug_sync.inc
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--echo #
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--echo # MDEV-23991 dict_table_stats_lock() has unnecessarily long scope
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--echo #
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CREATE TABLE t1(a INT) ENGINE=INNODB STATS_PERSISTENT=1;
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SET DEBUG_SYNC='dict_stats_update_persistent SIGNAL stop WAIT_FOR go';
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--send ANALYZE TABLE t1
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--connect(con1, localhost, root)
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SET DEBUG_SYNC='now WAIT_FOR stop';
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--replace_column 1 SUM
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SELECT SUM(DATA_LENGTH+INDEX_LENGTH) FROM information_schema.TABLES WHERE ENGINE='InnoDB';
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SET DEBUG_SYNC='now SIGNAL go';
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--disconnect con1
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--connection default
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--reap
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SET DEBUG_SYNC= 'RESET';
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DROP TABLE t1;
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