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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
42 lines
1.5 KiB
Text
42 lines
1.5 KiB
Text
# Can't run with embedded server
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--source include/not_embedded.inc
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--source include/no_view_protocol.inc
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# Disable concurrent inserts to avoid test failures when reading
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# data from concurrent connections (insert might return before
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# the data is actually in the table).
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set @old_concurrent_insert= @@global.concurrent_insert;
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set @@global.concurrent_insert= 0;
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# Test of the xml output of the 'mysql' and 'mysqldump' clients -- makes
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# sure that basic encoding issues are handled properly
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create table t1 (
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`a&b` int,
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`a<b` int NOT NULL,
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`a>b` text
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);
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insert into t1 values (1, 2, 'a&b a<b a>b');
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# Determine the number of open sessions
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--source include/count_sessions.inc
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--exec $MYSQL --xml test -e "select * from t1"
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--exec $MYSQL_DUMP --xml --skip-create-options test
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--exec $MYSQL --xml test -e "select count(*) from t1"
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--exec $MYSQL --xml test -e "select 1 < 2 from dual"
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--exec $MYSQL --xml test -e "select 1 > 2 from dual"
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--exec $MYSQL --xml test -e "select 1 & 3 from dual"
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--exec $MYSQL --xml test -e "select null from dual"
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--exec $MYSQL --xml test -e "select 1 limit 0"
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--exec $MYSQL --xml test -vv -e "select 1 limit 0"
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drop table t1;
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# Restore global concurrent_insert value
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set @@global.concurrent_insert= @old_concurrent_insert;
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# Wait till the number of open sessions is <= the number before the runs with
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# $MYSQL and $MYSQL_DUMP
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# = The session caused by mysql and mysqldump have finished their disconnect
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--source include/wait_until_count_sessions.inc
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