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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
109 lines
1.5 KiB
Text
109 lines
1.5 KiB
Text
#
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# Basic XA transactions syntax
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#
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--source ../have_engine.inc
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--source support_xa.inc
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--connect (con1,localhost,root,,)
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--connect (con2,localhost,root,,)
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--connection con1
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--let $create_definition = a $int_col
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--source ../create_table.inc
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--connection con2
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# Two-phase COMMIT
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XA START 'xa1';
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INSERT INTO t1 (a) VALUES (1);
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--connection con1
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--sorted_result
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SELECT a FROM t1;
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--connection con2
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INSERT INTO t1 (a) VALUES (2);
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XA END 'xa1';
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--connection con1
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--sorted_result
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SELECT a FROM t1;
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--connection con2
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XA PREPARE 'xa1';
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--connection con1
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--sorted_result
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SELECT a FROM t1;
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--connection con2
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XA RECOVER;
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XA COMMIT 'xa1';
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--connection con1
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--sorted_result
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SELECT a FROM t1;
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# One-phase COMMIT
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--connection con2
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XA START 'xa2';
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INSERT INTO t1 (a) VALUES (3);
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--connection con1
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--sorted_result
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SELECT a FROM t1;
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--connection con2
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INSERT INTO t1 (a) VALUES (4);
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XA END 'xa2';
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--connection con1
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--sorted_result
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SELECT a FROM t1;
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--connection con2
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XA COMMIT 'xa2' ONE PHASE;
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--connection con1
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--sorted_result
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SELECT a FROM t1;
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# Rollback
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--connection con2
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XA START 'xa3';
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INSERT INTO t1 (a) VALUES (5);
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--connection con1
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--sorted_result
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SELECT a FROM t1;
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--connection con2
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INSERT INTO t1 (a) VALUES (6);
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XA END 'xa3';
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--connection con1
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--sorted_result
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SELECT a FROM t1;
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--connection con2
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XA PREPARE 'xa3';
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--connection con1
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--sorted_result
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SELECT a FROM t1;
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--connection con2
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XA ROLLBACK 'xa3';
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--connection con1
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--sorted_result
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SELECT a FROM t1;
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DROP TABLE t1;
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--source ../cleanup_engine.inc
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