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bead24b7f3
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
757 B
Plaintext
25 lines
757 B
Plaintext
--source include/innodb_row_format.inc
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--connect(prevent_purge,localhost,root,,)
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start transaction with consistent snapshot;
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--connection default
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SET @fill_amount = (@@innodb_page_size / 2 ) + 1;
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CREATE TABLE t1 (col_text TEXT NOT NULL, KEY (col_text(9))) ENGINE=InnoDB;
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INSERT INTO t1 (col_text) VALUES (REPEAT('x', @fill_amount));
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UPDATE t1 SET col_text='';
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UPDATE t1 SET col_text=REPEAT('y', @fill_amount);
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--connect(con1,localhost,root,,)
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SET @fill_amount = (@@innodb_page_size / 2 ) + 1;
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BEGIN;
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INSERT INTO t1 (col_text) VALUES (REPEAT('z', @fill_amount));
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--connection default
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# If the bug is not fixed, CHECK TABLE will complain about wrong secondary index
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# rows count
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CHECK TABLE t1;
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--disconnect con1
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--disconnect prevent_purge
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DROP TABLE t1;
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