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lag.php
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lag.php
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<?php
/**
* Shows database lag
*
* 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
*
* @file
* @ingroup Maintenance
*/
// @codeCoverageIgnoreStart
require_once __DIR__ . '/Maintenance.php';
// @codeCoverageIgnoreEnd
/**
* Maintenance script to show database lag.
*
* @ingroup Maintenance
*/
class DatabaseLag extends Maintenance {
/** @var bool */
protected $stopReporting = false;
public function __construct() {
parent::__construct();
$this->addDescription( 'Shows database lag' );
$this->addOption( 'r', "Don't exit immediately, but show the lag every 5 seconds" );
}
public function execute() {
$lb = $this->getServiceContainer()->getDBLoadBalancer();
if ( $this->hasOption( 'r' ) ) {
$this->output( 'time ' );
$serverCount = $lb->getServerCount();
for ( $i = 1; $i < $serverCount; $i++ ) {
$hostname = $lb->getServerName( $i );
$this->output( sprintf( "%-12s ", $hostname ) );
}
$this->output( "\n" );
do {
$lags = $lb->getLagTimes();
unset( $lags[0] );
$this->output( gmdate( 'H:i:s' ) . ' ' );
foreach ( $lags as $lag ) {
$this->output(
sprintf(
"%-12s ",
$lag === false ? 'replication stopped or errored' : $lag
)
);
}
$this->output( "\n" );
sleep( 5 );
} while ( !$this->stopReporting );
} else {
$lags = $lb->getLagTimes();
foreach ( $lags as $i => $lag ) {
$name = $lb->getServerName( $i );
$this->output(
sprintf(
"%-20s %s\n",
$name,
$lag === false ? 'replication stopped or errored' : $lag
)
);
}
}
}
}
// @codeCoverageIgnoreStart
$maintClass = DatabaseLag::class;
require_once RUN_MAINTENANCE_IF_MAIN;
// @codeCoverageIgnoreEnd

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text/x-php
Expires
Aug 19 2026, 19:05 (6 w, 4 d ago)
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local-disk
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76/f8/5117ea4412351ef8f2fa241e3c2a
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lag.php (2 KB)

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