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84da20e658
This is actually an existing problem in the old binlog implementation, and this patch is applicable to old binlog also. The problem is that RESET MASTER can run concurrently with binlog dump threads / connected slaves. This will remove the binlog from under the feet of the reader, which can cause all sorts of strange behaviour. This patch fixes the problem by disallowing to run RESET MASTER when dump threads (or other RESET MASTER or SHOW BINARY LOGS) are running. An error is thrown in this case, user must stop slaves and/or kill dump threads to make the RESET MASTER go through. A slave that connects in the middle of RESET MASTER will wait for it to complete. Fix a lot of test cases to kill any lingering dump threads before doing RESET MASTER, mostly just by sourcing include/kill_binlog_dump_threads.inc. Signed-off-by: Kristian Nielsen <knielsen@knielsen-hq.org>
97 lines
2.4 KiB
PHP
97 lines
2.4 KiB
PHP
# ==== Purpose ====
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#
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# Reset all replication servers to a clean state:
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#
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# - sync all slaves,
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# - stop all slaves (STOP SLAVE),
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# - remove all binlogs and relay logs (RESET MASTER and RESET SLAVE),
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# - start all slaves again (START SLAVE).
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#
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# It does not execute CHANGE MASTER, so the replication topology is
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# kept intact.
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#
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#
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# ==== Usage ====
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#
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# [--let $rpl_only_running_threads= 1]
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# [--let $rpl_debug= 1]
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# [--let $slave_timeout= NUMBER]
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# --source include/rpl_end.inc
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#
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# Parameters:
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# $rpl_only_running_threads
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# If one or both of the IO and SQL threads is stopped, sync and
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# stop only the threads that are running. See
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# include/rpl_sync.inc and include/stop_slave.inc for details.
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#
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# $rpl_debug
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# See include/rpl_init.inc
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#
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# $slave_timeout
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# Set the timeout when waiting for slave threads to stop and
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# start, respectively. See include/wait_for_slave_param.inc
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#
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# Note:
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# This script will fail if Last_SQL_Error or Last_IO_Error is
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# nonempty. If you expect an error in the SQL thread, you should
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# normally do this before you source include/rpl_reset.inc:
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#
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# --source include/wait_for_slave_sql_error.inc
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# --source include/stop_slave_io.inc
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# RESET SLAVE;
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--let $include_filename= rpl_reset.inc
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--source include/begin_include_file.inc
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if (!$rpl_debug)
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{
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--disable_query_log
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}
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--source include/rpl_sync.inc
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if ($rpl_debug)
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{
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--echo ---- Stop and reset all servers ----
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}
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--let $_rpl_server= $rpl_server_count
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while ($_rpl_server)
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{
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--let $rpl_connection_name= server_$_rpl_server
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--source include/rpl_connection.inc
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# Check if this server is configured to have a master
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if (`SELECT SUBSTRING('$rpl_master_list', 1 + ($_rpl_server - 1) * $rpl_server_count_length, $rpl_server_count_length) != ''`)
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{
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--source include/stop_slave.inc
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}
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--dec $_rpl_server
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}
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--let $_rpl_server= $rpl_server_count
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while ($_rpl_server)
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{
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--let $rpl_connection_name= server_$_rpl_server
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--source include/rpl_connection.inc
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--source include/kill_binlog_dump_threads.inc
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RESET MASTER;
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# Check if this server is configured to have a master
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if (`SELECT SUBSTRING('$rpl_master_list', 1 + ($_rpl_server - 1) * $rpl_server_count_length, $rpl_server_count_length) != ''`)
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{
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--source include/reset_slave.inc
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}
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--dec $_rpl_server
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}
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--source include/rpl_start_slaves.inc
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--let $include_filename= rpl_reset.inc
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--source include/end_include_file.inc
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