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8361151765
FULL Bug#21753696: MAKE SHOW SLAVE STATUS NON BLOCKING IF IO THREAD WAITS FOR DISK SPACE Problem: ======== Currently SHOW SLAVE STATUS blocks if IO thread waits for disk space. This makes automation tools verifying server health block on taking relevant action. Finally this will create SHOW SLAVE STATUS piles. Analysis: ========= SHOW SLAVE STATUS hangs on mi->data_lock if relay log write is waiting for free disk space while holding mi->data_lock. mi->data_lock is needed to protect the format description event (mi->format_description_event) which is accessed by the clients running FLUSH LOGS and slave IO thread. Note relay log writes don't need to be protected by mi->data_lock, LOCK_log is used to protect relay log between IO and SQL thread (see MYSQL_BIN_LOG::append_event). The code takes mi->data_lock to protect mi->format_description_event during relay log rotate which might get triggered right after relay log write. Fix: ==== Release the data_lock just for the duration of writing into relay log. Made change to ensure the following lock order is maintained to avoid deadlocks. data_lock, LOCK_log data_lock is held during relay log rotations to protect the description event.
148 lines
3.6 KiB
PHP
148 lines
3.6 KiB
PHP
# ==== Purpose ====
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#
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# After a server has restarted, this waits for all clients configured
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# by rpl_init.inc and/or master-slave.inc to reconnect again.
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#
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# For each connection, it issues this:
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# --enable_reconnect
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# --source include/wait_until_connected_again.inc
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# --disable_reconnect
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#
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#
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# ==== Usage ====
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#
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# --let $rpl_server_number= N
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# [--let $rpl_extra_connections_per_server= 1]
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# [--let $rpl_debug= 1]
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# --source include/rpl_reconnect.inc
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#
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# Parameters:
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# $rpl_server_number
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# Number to identify the server that needs to reconnect. 1 is the
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# master server, 2 the slave server, 3 the 3rd server, and so on.
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# Cf. include/rpl_init.inc
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#
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# $rpl_extra_connections_per_server, $rpl_debug
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# See include/rpl_init.inc
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--let $include_filename= rpl_reconnect.inc
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--source include/begin_include_file.inc
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if (!$rpl_server_number)
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{
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--die ERROR IN TEST: you must set $rpl_server_number before you source rpl_connect.inc
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}
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if ($_rpl_extra_connections_per_server == '')
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{
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--let $_rpl_extra_connections_per_server= 1
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}
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if ($rpl_debug)
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{
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--echo ---- Enable reconnect ----
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}
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--let $_rpl_server_number= $rpl_server_number
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--dec $_rpl_server_number
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if (!$_rpl_server_number)
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{
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--let $rpl_connection_name= default
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--source include/rpl_connection.inc
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--enable_reconnect
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--let $rpl_connection_name= master
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--source include/rpl_connection.inc
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--enable_reconnect
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--let $rpl_connection_name= master1
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--source include/rpl_connection.inc
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--enable_reconnect
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}
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--dec $_rpl_server_number
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if (!$_rpl_server_number)
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{
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--let $rpl_connection_name= slave
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--source include/rpl_connection.inc
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--enable_reconnect
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--let $rpl_connection_name= slave1
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--source include/rpl_connection.inc
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--enable_reconnect
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}
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--let $rpl_connection_name= server_$rpl_server_number
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--source include/rpl_connection.inc
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--enable_reconnect
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--let $_rpl_connection_number= 1
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while ($_rpl_connection_number <= $_rpl_extra_connections_per_server)
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{
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--let $rpl_connection_name= server_$rpl_server_number$underscore$_rpl_connection_number
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--source include/rpl_connection.inc
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--enable_reconnect
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--inc $_rpl_connection_number
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}
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if ($rpl_debug)
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{
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--echo ---- Wait for reconnect and disable reconnect on all connections ----
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}
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--let $_rpl_server_number= $rpl_server_number
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--dec $_rpl_server_number
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if (!$_rpl_server_number)
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{
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--let $rpl_connection_name= default
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--source include/rpl_connection.inc
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--source include/wait_until_connected_again.inc
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--disable_reconnect
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--let $rpl_connection_name= master
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--source include/rpl_connection.inc
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--source include/wait_until_connected_again.inc
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--disable_reconnect
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--let $rpl_connection_name= master1
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--source include/rpl_connection.inc
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--source include/wait_until_connected_again.inc
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--disable_reconnect
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}
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--dec $_rpl_server_number
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if (!$_rpl_server_number)
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{
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--let $rpl_connection_name= slave
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--source include/rpl_connection.inc
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--source include/wait_until_connected_again.inc
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--disable_reconnect
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--let $rpl_connection_name= slave1
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--source include/rpl_connection.inc
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--source include/wait_until_connected_again.inc
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--disable_reconnect
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}
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--let $rpl_connection_name= server_$rpl_server_number
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--source include/rpl_connection.inc
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--source include/wait_until_connected_again.inc
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--disable_reconnect
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--let $_rpl_connection_number= 1
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while ($_rpl_connection_number <= $_rpl_extra_connections_per_server)
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{
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--let $rpl_connection_name= server_$rpl_server_number$underscore$_rpl_connection_number
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--source include/rpl_connection.inc
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--source include/wait_until_connected_again.inc
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--disable_reconnect
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--inc $_rpl_connection_number
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}
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--let $include_filename= rpl_reconnect.inc
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--source include/end_include_file.inc
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