249 lines
9.7 KiB
PHP
249 lines
9.7 KiB
PHP
# ==== Purpose ====
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#
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# Changes replication topology. This file is normally sourced from
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# include/rpl_init.inc, but test cases can also source it if they
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# need to change topology after they have sourced include/rpl_init.inc
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#
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# This file sets up variables needed by include/rpl_sync.inc and many
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# other replication scripts in the include/ directory. It also issues
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# CHANGE MASTER on all servers where the configuration changes from
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# what it was before. It does not issue START SLAVE (use
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# include/rpl_start_slaves.inc for that).
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#
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# Note: it is not currently possible to change the number of servers
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# after the rpl_init.inc, without first calling rpl_end.inc. So the
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# test has to set $rpl_server_count to the total number of servers
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# that the test uses, before it sources include/rpl_init.inc. After
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# that, $rpl_server_count must not change until after next time the
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# test sources include/rpl_end.inc.
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#
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# Note: Since this script issues CHANGE MASTER, the test case must
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# ensure that all slaves where the configuration changes have stopped
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# both the IO thread and the SQL thread before this script is sourced.
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#
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#
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# ==== Usage ====
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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_skip_change_master= 1]
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# [--let $rpl_master_log_file= 1:master-bin.000001,3:master-bin.000003]
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# [--let $rpl_master_log_pos= 1:4711,3:107]
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# [--let $rpl_debug= 1]
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# --source include/rpl_change_topology.inc
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#
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# Parameters:
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# $rpl_master_log_file
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# By default, CHANGE MASTER is executed with MASTER_LOG_FILE set
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# to the name of the last binlog file on the master (retrieved by
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# executing SHOW MASTER STATUS). This variable can be set to
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# specify another filename. This variable should be a
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# comma-separated list of the following form:
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#
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# SERVER_NUMBER_1:FILE_NAME_1,SERVER_NUMBER_2:FILE_NAME_2,...
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#
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# Before CHANGE MASTER is executed on server N, this script checks
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# if $rpl_master_log_file contains the text N:FILE_NAME. If it
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# does, then MASTER_LOG_FILE is set to FILE_NAME. Otherwise,
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# MASTER_LOG_FILE is set to the last binlog on the master. For
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# example, to specify that server_1 should start replicate from
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# master-bin.000007 and server_5 should start replicate from
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# master-bin.012345, do:
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# --let $rpl_master_log_file= 1:master-bin.000007,5:master-bin.012345
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#
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# $rpl_master_log_pos
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# By default, CHANGE MASTER is executed without specifying the
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# MASTER_LOG_POS parameter. This variable can be set to set a
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# specific position. It has the same form as $rpl_master_log_file
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# (see above). For example, to specify that server_3 should start
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# replicate from position 4711 of its master, do:
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# --let $rpl_master_log_pos= 3:4711
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#
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# $rpl_server_count, $rpl_topology, $rpl_debug, $rpl_skip_change_master
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# See include/rpl_init.inc
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#
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#
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# ==== Internal variables configured by this file ====
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#
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# This file sets up the following variables, which are used by other
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# low-level replication files such as:
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# include/rpl_sync.inc
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# include/rpl_start_slaves.inc
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# include/rpl_stop_slaves.inc
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# include/rpl_end.inc
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#
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# $rpl_server_count_length:
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# Set to LENGTH($rpl_server_count). So if $rpl_server_count < 10,
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# then $rpl_server_count_length = 1; if 10 <= $rpl_server_count <
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# 100, then $rpl_server_count_length = 2, etc.
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#
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# $rpl_master_list
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# Set to a string consisting of $rpl_server_count numbers, each one
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# whitespace-padded to $rpl_server_count_length characters. If
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# server N is a slave, then the N'th number is the master of server
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# N. If server N is not a slave, then the N'th number is just spaces
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# (so in fact it is not a number). For example, if $rpl_topology is
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# '1->2,2->3,3->1,2->4,5->6', then $rpl_master_list is '3122 6'.
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#
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# $rpl_sync_chain_dirty
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# This variable is set to 1. This tells include/rpl_sync.inc to
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# compute a new value for $rpl_sync_chain next time that
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# include/rpl_sync.inc is sourced. See
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# include/rpl_generate_sync_chain.inc and include/rpl_sync.inc for
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# details.
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# Remove whitespace from $rpl_topology
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--let $rpl_topology= `SELECT REPLACE('$rpl_topology', ' ', '')`
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--let $include_filename= rpl_change_topology.inc [new topology=$rpl_topology]
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--source include/begin_include_file.inc
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if ($rpl_debug)
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{
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--echo ---- Check input ----
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}
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if (`SELECT '$rpl_topology' = '' OR '$rpl_server_count' = ''`)
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{
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--die You must set $rpl_topology and $rpl_server_count before you source rpl_change_topology.inc. If you really want to change to the empty topology, set $rpl_topology= none
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}
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--let $_rpl_topology= $rpl_topology
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if (`SELECT '$_rpl_topology' = 'none'`)
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{
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--let $_rpl_topology=
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}
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if (`SELECT '!$rpl_master_list!' = '!!'`)
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{
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--die You must source include/rpl_init.inc before you source include/rpl_change_topology.inc
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}
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--let $_rpl_old_master_list= $rpl_master_list
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if ($rpl_debug)
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{
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--echo \$rpl_server_count='$rpl_server_count'
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--echo \$rpl_server_count_length='$rpl_server_count_length'
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--echo new \$rpl_topology='$_rpl_topology'
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--echo old \$rpl_master_list='$rpl_master_list'
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--echo old \$rpl_sync_chain='$rpl_sync_chain'
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}
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if ($rpl_debug)
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{
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--echo ---- Generate \$rpl_server_count_length and \$rpl_master_list ----
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}
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--let $rpl_server_count_length= `SELECT LENGTH('$rpl_server_count')`
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--let $rpl_master_list=
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--let $_rpl_no_server= `SELECT REPEAT(' ', $rpl_server_count_length)`
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--let $rpl_master_list= `SELECT REPEAT('$_rpl_no_server', $rpl_server_count)`
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while ($_rpl_topology)
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{
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# Get 's1->s2' from 's1->s2->s3->...' or from 's1->s2,s3->s4,...'
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--let $_rpl_master_slave= `SELECT SUBSTRING_INDEX(SUBSTRING_INDEX('$_rpl_topology', ',', 1), '->', 2)`
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# Modify $_rpl_topology as follows:
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# - If it starts with 's1->s2,', remove 's1->s2,'
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# - If it starts with 's1->s2->', remove 's1->'
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# - If it is equal to 's1->s2', remove 's1->s2'
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--let $_rpl_topology= `SELECT SUBSTR('$_rpl_topology', IF(SUBSTR('$_rpl_topology', LENGTH('$_rpl_master_slave') + 1, 2) != '->', LENGTH('$_rpl_master_slave'), LOCATE('->', '$_rpl_master_slave')) + 2)`
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# Get 's1' from 's1->s2'
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--let $_rpl_master= `SELECT SUBSTRING_INDEX('$_rpl_master_slave', '->', 1)`
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# Get 's2' from 's1->s2'
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--let $_rpl_slave= `SELECT SUBSTRING('$_rpl_master_slave', LENGTH('$_rpl_master') + 3)`
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# Check that s2 does not have another master.
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if (`SELECT SUBSTR('$rpl_master_list', 1 + ($_rpl_slave - 1) * $rpl_server_count_length, $rpl_server_count_length) != '$_rpl_no_server'`)
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{
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--echo ERROR IN TEST: Server '$_rpl_slave' has more than one master in topology '$rpl_topology'
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--die ERROR IN TEST: found a server with more than one master in the $rpl_topology variable
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}
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# Save 's1' at position 's2' in $rpl_master_list
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--let $rpl_master_list= `SELECT INSERT('$rpl_master_list', 1 + ($_rpl_slave - 1) * $rpl_server_count_length, $rpl_server_count_length, RPAD('$_rpl_master', $rpl_server_count_length, ' '))`
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}
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if ($rpl_debug)
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{
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--echo new \$rpl_server_count_length = '$rpl_server_count_length'
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--echo new \$rpl_master_list = '$rpl_master_list'
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}
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if (!$rpl_skip_change_master)
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{
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if ($rpl_debug)
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{
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--echo ---- Execute CHANGE MASTER on all servers ----
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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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--let $_rpl_server= $rpl_server_count
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while ($_rpl_server)
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{
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# The following statement evaluates to:
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# 0, if server_$_rpl_server has the same master as before.
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# The master's server, if server_$_rpl_server is a slave.
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# The empty string, if server_$_rpl_server is not a slave.
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--let $_rpl_master= `SELECT TRIM(IFNULL(NULLIF(SUBSTRING('$rpl_master_list', 1 + ($_rpl_server - 1) * $rpl_server_count_length, $rpl_server_count_length), SUBSTRING('$_rpl_old_master_list', 1 + ($_rpl_server - 1) * $rpl_server_count_length, $rpl_server_count_length)), 0))`
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if ($rpl_debug)
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{
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--echo \$_rpl_server='$_rpl_server' \$_rpl_master='$_rpl_master'
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}
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if ($_rpl_master)
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{
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# Get port number
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--let $_rpl_port= \$SERVER_MYPORT_$_rpl_master
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# Get MASTER_LOG_FILE
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--let $_rpl_master_log_file_index= `SELECT LOCATE('$_rpl_server:', '$rpl_master_log_file')`
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if ($_rpl_master_log_file_index)
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{
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# Get text from after ':' and before ',', starting at
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# $_rpl_master_log_file
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--let $_rpl_master_log_file= `SELECT SUBSTRING_INDEX(SUBSTRING_INDEX(SUBSTRING('$rpl_master_log_file', $_rpl_master_log_file_index), ',', 1), ':', -1)`
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}
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if (!$_rpl_master_log_file_index)
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{
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--let $rpl_connection_name= server_$_rpl_master
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--source include/rpl_connection.inc
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--let $_rpl_master_log_file= query_get_value(SHOW MASTER STATUS, File, 1)
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}
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# Change connection.
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--let $rpl_connection_name= server_$_rpl_server
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--source include/rpl_connection.inc
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# Get MASTER_LOG_POS
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--let $_rpl_master_log_pos_index= `SELECT LOCATE('$_rpl_server:', '$rpl_master_log_pos')`
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if ($_rpl_master_log_pos_index)
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{
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--let $_rpl_master_log_pos= `SELECT SUBSTRING_INDEX(SUBSTRING_INDEX(SUBSTRING('$rpl_master_log_pos', $_rpl_master_log_pos_index), ',', 1), ':', -1)`
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--let $_rpl_master_log_pos= , MASTER_LOG_POS = $_rpl_master_log_pos
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}
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if (!$_rpl_master_log_pos_index)
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{
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--let $_rpl_master_log_pos=
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}
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eval CHANGE MASTER TO MASTER_HOST = '127.0.0.1', MASTER_PORT = $_rpl_port, MASTER_USER = 'root', MASTER_LOG_FILE = '$_rpl_master_log_file'$_rpl_master_log_pos, MASTER_CONNECT_RETRY = 1;
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}
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if (!$_rpl_master)
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{
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if (`SELECT '$_rpl_master' = ''`)
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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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CHANGE MASTER TO MASTER_HOST = '';
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}
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}
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--dec $_rpl_server
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}
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}
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--let $rpl_sync_chain_dirty= 1
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--let $include_filename= rpl_change_topology.inc
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--source include/end_include_file.inc
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