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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.
261 lines
7.7 KiB
PHP
261 lines
7.7 KiB
PHP
# ==== Purpose ====
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#
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# Set up replication on several servers in a specified topology.
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#
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# By default, this script does the following:
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# - Creates the connections server_1, server_2, ..., server_N, as
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# well as extra connections server_1_1, server_2_1, ...,
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# server_N_1. server_I and server_I_1 are connections to the same
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# server.
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# - Verifies that @@server_id of all servers are different.
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# - Calls RESET MASTER, RESET SLAVE, USE test, CHANGE MASTER, START SLAVE.
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# - Sets the connection to server_1 before exiting.
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#
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# ==== Usage ====
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#
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# 1. If you are going to use more than two servers, create
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# rpl_test.cfg with the following contents:
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#
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# !include ../my.cnf
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# [mysqld.1]
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# log-slave-updates
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# [mysqld.2]
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# log-slave-updates
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# ...
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# [mysqld.N]
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# log-slave-updates
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#
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# [ENV]
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# SERVER_MYPORT_3= @mysqld.3.port
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# SERVER_MYPORT_4= @mysqld.4.port
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# SERVER_MYPORT_5= @mysqld.5.port
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# ...
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# SERVER_MYPORT_N= @mysqld.N.port
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#
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# (It is allowed, but not required, to configure SERVER_MYPORT_1
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# and SERVER_MYPORT_2 too. If these variables are not set, the
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# variables MASTER_MYPORT and SLAVE_MYPORT, configured in the
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# default my.cnf used by the rpl and rpl_ndb suites, are used
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# instead. In addition, in the rpl_ndb suite, SERVER_MYPORT_3 is
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# not needed since MASTER_MYPORT1 can be used instead.)
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#
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# 2. Execute the following near the top of the test:
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#
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# [--let $rpl_server_count= 7]
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# --let $rpl_topology= 1->2->3->1->4, 2->5, 6->7
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# [--let $rpl_extra_connections_per_server= 1]
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# [--let $rpl_check_server_ids= 1]
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# [--let $rpl_skip_change_master= 1]
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# [--let $rpl_skip_start_slave= 1]
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# [--let $rpl_skip_reset_master_and_slave= 1]
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# [--let $rpl_debug= 1]
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# [--let $slave_timeout= NUMBER]
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# --source include/rpl_init.inc
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#
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# Parameters:
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#
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# $rpl_server_count
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# The number of servers to configure. If this is not set, the largest
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# number in $rpl_topology will be used.
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#
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# $rpl_topology
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# A comma-separated list of replication chain
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# specifications. Each replication chain specification has the
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# form S1->S2->...->Sn, where 1 <= S1,...Sn <= $rpl_server_count.
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# This file will configure S(i+1) to be a slave of S(i). If you
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# want to specify the empty topology (no server replicates at
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# all), you have to set $rpl_topology=none.
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#
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# $rpl_extra_connections_per_server
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# By default, this script creates connections server_N and
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# server_N_1. If you can set this variable to a number, the
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# script creates:
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# server_N, server_N_1, ..., server_N_$rpl_extra_connections_per_server
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#
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# $rpl_check_server_ids
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# If $rpl_check_server_ids is set, this script checks that the
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# @@server_id of all servers are different. This is normally
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# guaranteed by mtr, so it is only useful for debugging.
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#
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# $rpl_skip_reset_master_and_slave
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# By default, this script issues RESET MASTER and RESET SLAVE
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# before CHANGE MASTER and START SLAVE. RESET MASTER and RESET
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# SLAVE are suppressed if $rpl_skip_reset_master_and_slave is
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# set.
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#
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# $rpl_skip_change_master
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# By default, this script issues CHANGE MASTER so that all slaves
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# are ready to run as specified by $rpl_topology. CHANGE MASTER
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# is suppressed if $rpl_skip_change_master is set.
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#
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# $rpl_skip_start_slave
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# By default, this script issues START SLAVE on all slaves
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# specified by $rpl_topology. START SLAVE is suppressed if
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# $rpl_skip_change_master is set.
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#
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# $rpl_debug
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# By default, this script only outputs a static text that says
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# that rpl_init.inc was invoked. If $rpl_debug is set, additional
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# debug info is printed. The debug info may be nondeterministic,
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# so no test case should be checked in with $rpl_debug set.
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#
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# $slave_timeout
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# Timeout used when waiting for the slave threads to start.
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# See include/wait_for_slave_param.inc
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#
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#
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# ==== Side effects ====
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#
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# Changes current connection to server_1.
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--source include/have_log_bin.inc
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--let $include_filename= rpl_init.inc [topology=$rpl_topology]
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--source include/begin_include_file.inc
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if ($rpl_debug)
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{
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--echo ---- Check input ----
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--echo MASTER_MYPORT='$MASTER_MYPORT' SLAVE_MYPORT='$SLAVE_MYPORT' MASTER_MYPORT1='$MASTER_MYPORT1' SLAVE_MYPORT1='$SLAVE_MYPORT1'
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}
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# Allow $MASTER_MYPORT as alias for $SERVER_MYPORT_1
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if (!$SERVER_MYPORT_1)
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{
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--let SERVER_MYPORT_1= $MASTER_MYPORT
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}
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# Allow $SLAVE_MYPORT as alias for $SERVER_MYPORT_2
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if (!$SERVER_MYPORT_2)
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{
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--let SERVER_MYPORT_2= $SLAVE_MYPORT
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}
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# Allow $MASTER_MYPORT1 as alias for $SERVER_MYPORT_3
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# (this alias is used by rpl_ndb tests)
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if (!$SERVER_MYPORT_3)
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{
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--let SERVER_MYPORT_3= $MASTER_MYPORT1
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}
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# Allow $SLAVE_MYPORT1 as alias for $SERVER_MYPORT_4
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# (this alias is used by rpl_ndb tests)
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if (!$SERVER_MYPORT_4)
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{
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--let SERVER_MYPORT_4= $SLAVE_MYPORT1
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}
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# Check that $rpl_server_count is set
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if (!$rpl_server_count)
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{
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--let $rpl_server_count= `SELECT REPLACE('$rpl_topology', '->', ',')`
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if (`SELECT LOCATE(',', '$rpl_server_count')`)
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{
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--let $rpl_server_count= `SELECT GREATEST($rpl_server_count)`
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}
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}
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--let $_rpl_extra_connections_per_server= $rpl_extra_connections_per_server
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if ($_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 ---- Setup connections and reset each server ----
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}
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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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# Create two connections to each server; reset master/slave, select
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# database, set autoinc variables.
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--let $_rpl_server= $rpl_server_count
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--let $underscore= _
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while ($_rpl_server)
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{
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# Connect.
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--let $rpl_server_number= $_rpl_server
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--let $rpl_connection_name= server_$_rpl_server
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--source include/rpl_connect.inc
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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$underscore$_rpl_connection_number
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--source include/rpl_connect.inc
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--inc $_rpl_connection_number
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}
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# Configure server.
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--let $rpl_connection_name= server_$_rpl_server
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--source include/rpl_connection.inc
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USE test;
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if (!$rpl_skip_reset_master_and_slave)
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{
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RESET MASTER;
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RESET SLAVE;
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}
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--dec $_rpl_server
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}
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# Signal that initialization is done and all connections created.
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--let $rpl_inited= 1
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# Signal that the server is in a dirty state and needs to be restarted
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# if the test is skipped. If the test is not skipped, it will continue
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# to the end and execute its cleanup section (and check-testcase will
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# report if you forget to clean up).
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--source include/force_restart_if_skipped.inc
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# Assert that all hosts have different server_ids
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if ($rpl_check_server_ids)
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{
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if ($rpl_debug)
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{
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--echo ---- Check that @@server_id is distinct for 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_server2= $_rpl_server
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--dec $_rpl_server2
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while ($_rpl_server2)
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{
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--let $assert_text= Servers $_rpl_server and $_rpl_server2 should have different @@server_id
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--let $assert_condition= [$_rpl_server:SELECT @@server_id AS i, i, 1] != [$_rpl_server2:SELECT @@server_id AS i, i, 1]
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--source include/assert.inc
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--dec $_rpl_server2
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}
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--dec $_rpl_server
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}
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}
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# $rpl_master_list must be set so that include/rpl_change_topology.inc
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# knows which servers are initialized and not.
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--let $rpl_master_list= `SELECT REPEAT('x', $rpl_server_count * LENGTH($rpl_server_count))`
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--source include/rpl_change_topology.inc
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if (!$rpl_skip_start_slave)
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{
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--source include/rpl_start_slaves.inc
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}
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--let $rpl_connection_name= server_1
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--source include/rpl_connection.inc
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--let $skip_restore_connection= 1
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--let $include_filename= rpl_init.inc
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--source include/end_include_file.inc
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