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<?php
/**
* Show some statistics on the blob_orphans table, created with trackBlobs.php.
*
* 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 ExternalStorage
*/
require_once __DIR__ . '/../Maintenance.php';
use MediaWiki\MediaWikiServices;
/**
* Maintenance script that shows some statistics on the blob_orphans table,
* created with trackBlobs.php.
*
* @ingroup Maintenance ExternalStorage
*/
class OrphanStats extends Maintenance {
public function __construct() {
parent::__construct();
$this->addDescription(
"Show some statistics on the blob_orphans table, created with trackBlobs.php" );
}
protected function &getDB( $cluster, $groups = [], $wiki = false ) {
$lbFactory = MediaWikiServices::getInstance()->getDBLoadBalancerFactory();
$lb = $lbFactory->getExternalLB( $cluster );
return $lb->getConnection( DB_REPLICA );
}
public function execute() {
$dbr = $this->getDB( DB_REPLICA );
if ( !$dbr->tableExists( 'blob_orphans' ) ) {
$this->fatalError( "blob_orphans doesn't seem to exist, need to run trackBlobs.php first" );
}
$res = $dbr->select( 'blob_orphans', '*', '', __METHOD__ );
$num = 0;
$totalSize = 0;
$hashes = [];
$maxSize = 0;
foreach ( $res as $boRow ) {
$extDB = $this->getDB( $boRow->bo_cluster );
$blobRow = $extDB->selectRow(
'blobs',
'*',
[ 'blob_id' => $boRow->bo_blob_id ],
__METHOD__
);
$num++;
$size = strlen( $blobRow->blob_text );
$totalSize += $size;
$hashes[sha1( $blobRow->blob_text )] = true;
$maxSize = max( $size, $maxSize );
}
unset( $res );
$this->output( "Number of orphans: $num\n" );
if ( $num > 0 ) {
$this->output( "Average size: " . round( $totalSize / $num, 0 ) . " bytes\n" .
"Max size: $maxSize\n" .
"Number of unique texts: " . count( $hashes ) . "\n" );
}
}
}
$maintClass = OrphanStats::class;
require_once RUN_MAINTENANCE_IF_MAIN;
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