154 lines
4.6 KiB
PHP
154 lines
4.6 KiB
PHP
# ==== Purpose ====
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#
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# Sync all servers in an arbitrary replication topology. This works
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# only if the servers have been configured with rpl_init.inc (and
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# possibly rpl_change_topology.inc).
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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_sync.inc
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#
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# Parameters:
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# $rpl_only_running_threads
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# By default, this script assumes that both the IO thread and the
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# SQL thread are running and fails if one of them is stopped. If
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# $rpl_only_running_threads is set, this script first checks
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# which slave threads are running:
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# - If both threads are running, sync both threads with master.
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# - If only IO thread is running, sync IO thread with master.
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# - If only SQL thread is running, sync SQL thread with IO thread.
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# - If no thread is running, don't sync.
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#
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# $slave_timeout
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# Set the timeout when waiting for threads to sync. See
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# include/wait_for_slave_param.inc
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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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#
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# ==== Side effects ====
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#
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# Does not change the current connection (note that this is different
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# from mysqltest's built-in sync_slave_with_master command).
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--let $include_filename= rpl_sync.inc
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--source include/begin_include_file.inc
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# Compute $rpl_sync_chain if needed. We could have done this in
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# rpl_change_topology.inc, but instead we do it here because that
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# means we only compute $rpl_sync_chain when it is needed.
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if ($rpl_sync_chain_dirty)
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{
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--source include/rpl_generate_sync_chain.inc
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--let $rpl_sync_chain_dirty= 0
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}
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if ($rpl_debug)
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{
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--echo \$rpl_sync_chain = '$rpl_sync_chain' \$rpl_only_running_threads= $rpl_only_running_threads
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}
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if (!$rpl_server_count_length)
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{
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--die \$rpl_server_count_length is not set. Did you call rpl_init.inc?
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}
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--let $_rpl_i= 1
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--let $_rpl_connect= 0
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while ($_rpl_i) {
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# $rpl_sync_chain consists of a sequence of sync chains. Each sync
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# chain has the form:
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#
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# <space><server1_1><server1_2>...<server1_N>
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#
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# So the space character indicates that a new sync chain starts.
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--let $_rpl_server= `SELECT TRIM(SUBSTR('$rpl_sync_chain', 1 + ($_rpl_i - 1) * $rpl_server_count_length, $rpl_server_count_length))`
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if ($_rpl_server)
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{
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if ($rpl_debug)
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{
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--echo [sync server_$_rpl_prev_server -> server_$_rpl_server]
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}
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if ($rpl_only_running_threads)
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{
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--connection server_$_rpl_server
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--let $_rpl_slave_io_running= query_get_value(SHOW SLAVE STATUS, Slave_IO_Running, 1)
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--let $_rpl_slave_sql_running= query_get_value(SHOW SLAVE STATUS, Slave_SQL_Running, 1)
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if ($rpl_debug)
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{
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--echo Sync IO: $_rpl_slave_io_running; Sync SQL: $_rpl_slave_sql_running
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}
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--let $_rpl_slave_io_running= `SELECT IF('$_rpl_slave_io_running' != 'No', 1, '')`
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--let $_rpl_slave_sql_running= `SELECT IF('$_rpl_slave_sql_running' = 'Yes', 1, '')`
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if ($_rpl_slave_io_running)
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{
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--connection server_$_rpl_prev_server
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if ($_rpl_slave_sql_running)
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{
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if ($rpl_debug)
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{
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--let $_rpl_master_file= query_get_value("SHOW MASTER STATUS", File, 1)
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--let $_rpl_master_pos= query_get_value("SHOW MASTER STATUS", Position, 1)
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--echo syncing master_file='$_rpl_master_file' master_pos='$_rpl_master_pos'
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}
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--sync_slave_with_master server_$_rpl_server
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}
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if (!$_rpl_slave_sql_running)
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{
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--let $sync_slave_connection= server_$_rpl_server
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--source include/sync_slave_io_with_master.inc
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}
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}
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if (!$_rpl_slave_io_running)
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{
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if ($_rpl_slave_sql_running)
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{
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--source include/sync_slave_sql_with_io.inc
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}
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}
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}
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if (!$rpl_only_running_threads)
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{
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--connection server_$_rpl_prev_server
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if ($rpl_debug)
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{
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--let $_rpl_master_file= query_get_value("SHOW MASTER STATUS", File, 1)
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--let $_rpl_master_pos= query_get_value("SHOW MASTER STATUS", Position, 1)
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--echo syncing master_file='$_rpl_master_file' master_pos='$_rpl_master_pos'
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}
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--sync_slave_with_master server_$_rpl_server
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}
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}
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# This happens at the beginning of a new sync subchain and at the
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# end of the full sync chain.
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if (!$_rpl_server)
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{
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--inc $_rpl_i
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--let $_rpl_server= `SELECT TRIM(SUBSTR('$rpl_sync_chain', 1 + ($_rpl_i - 1) * $rpl_server_count_length, $rpl_server_count_length))`
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if (!$_rpl_server)
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{
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# terminate loop
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--let $_rpl_i= -1
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}
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}
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--let $_rpl_prev_server= $_rpl_server
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--inc $_rpl_i
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}
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--let $include_filename= rpl_sync.inc
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--source include/end_include_file.inc
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