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