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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 |
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| .. | ||
| cons_snapshot_repeatable_read.result | ||
| cons_snapshot_repeatable_read.test | ||
| cons_snapshot_serializable.result | ||
| cons_snapshot_serializable.test | ||
| consistent_snapshot.inc | ||
| delete.result | ||
| delete.test | ||
| insert.result | ||
| insert.test | ||
| level_read_committed.result | ||
| level_read_committed.test | ||
| level_read_uncommitted.result | ||
| level_read_uncommitted.test | ||
| level_repeatable_read.result | ||
| level_repeatable_read.test | ||
| level_serializable.result | ||
| level_serializable.test | ||
| my.cnf | ||
| select_for_update.result | ||
| select_for_update.test | ||
| select_lock_in_share_mode.result | ||
| select_lock_in_share_mode.test | ||
| support_savepoints.inc | ||
| support_transactions.inc | ||
| support_xa.inc | ||
| transaction_isolation.inc | ||
| update.result | ||
| update.test | ||
| xa.result | ||
| xa.test | ||
| xa_recovery.result | ||
| xa_recovery.test | ||