60 lines
2 KiB
PHP
60 lines
2 KiB
PHP
<?php
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/**
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* Run a database query in batches and wait for slaves. This is used on large
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* wikis to prevent replication lag from going through the roof when executing
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* large write queries.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @ingroup Maintenance
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*/
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require_once( dirname(__FILE__) . '/Maintenance.php' );
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class BatchedQueryRunner extends Maintenance {
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public function __construct() {
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parent::__construct();
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$this->mDescription = "Run a query repeatedly until it affects 0 rows, and wait for slaves in between.\n" .
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"NOTE: You need to set a LIMIT clause yourself.";
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$this->addOption( 'wait', "Wait for replication lag to go down to this value. Default: 5", false, true );
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}
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public function execute() {
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if ( !$this->hasArg() )
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$this->error( "No query specified. Specify the query as a command line parameter.", true );
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$query = $this->getArg();
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$wait = $this->getOption( 'wait', 5 );
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$n = 1;
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$dbw = wfGetDb( DB_MASTER );
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do {
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$this->output( "Batch $n: " );
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$n++;
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$dbw->query( $query );
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$affected = $dbw->affectedRows();
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$this->output( "$affected rows\n" );
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wfWaitForSlaves( $wait );
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} while ( $affected > 0 );
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}
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public function getDbType() {
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return Maintenance::DB_ADMIN;
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}
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}
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$maintClass = "BatchedQueryRunner";
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require_once( DO_MAINTENANCE );
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