maintenance/storage/orphanStats.php

   1 <?php
   2 /**
   3  * Show some statistics on the blob_orphans table, created with trackBlobs.php.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Maintenance ExternalStorage
  22  */
  23
  24 require_once __DIR__ . '/../Maintenance.php';
  25
  26 use MediaWiki\MediaWikiServices;
  27
  28 /**
  29  * Maintenance script that shows some statistics on the blob_orphans table,
  30  * created with trackBlobs.php.
  31  *
  32  * @ingroup Maintenance ExternalStorage
  33  */
  34 class OrphanStats extends Maintenance {
  35         public function __construct() {
  36                 parent::__construct();
  37                 $this->addDescription(
  38                         "Show some statistics on the blob_orphans table, created with trackBlobs.php" );
  39         }
  40
  41         protected function &getDB( $cluster, $groups = [], $wiki = false ) {
  42                 $lbFactory = MediaWikiServices::getInstance()->getDBLoadBalancerFactory();
  43                 $lb = $lbFactory->getExternalLB( $cluster );
  44
  45                 return $lb->getConnection( DB_REPLICA );
  46         }
  47
  48         public function execute() {
  49                 $dbr = $this->getDB( DB_REPLICA );
  50                 if ( !$dbr->tableExists( 'blob_orphans' ) ) {
  51                         $this->fatalError( "blob_orphans doesn't seem to exist, need to run trackBlobs.php first" );
  52                 }
  53                 $res = $dbr->select( 'blob_orphans', '*', '', __METHOD__ );
  54
  55                 $num = 0;
  56                 $totalSize = 0;
  57                 $hashes = [];
  58                 $maxSize = 0;
  59
  60                 foreach ( $res as $row ) {
  61                         $extDB = $this->getDB( $row->bo_cluster );
  62                         $blobRow = $extDB->selectRow(
  63                                 'blobs',
  64                                 '*',
  65                                 [ 'blob_id' => $row->bo_blob_id ],
  66                                 __METHOD__
  67                         );
  68
  69                         $num++;
  70                         $size = strlen( $blobRow->blob_text );
  71                         $totalSize += $size;
  72                         $hashes[sha1( $blobRow->blob_text )] = true;
  73                         $maxSize = max( $size, $maxSize );
  74                 }
  75                 unset( $res );
  76
  77                 $this->output( "Number of orphans: $num\n" );
  78                 if ( $num > 0 ) {
  79                         $this->output( "Average size: " . round( $totalSize / $num, 0 ) . " bytes\n" .
  80                                 "Max size: $maxSize\n" .
  81                                 "Number of unique texts: " . count( $hashes ) . "\n" );
  82                 }
  83         }
  84 }
  85
  86 $maintClass = OrphanStats::class;
  87 require_once RUN_MAINTENANCE_IF_MAIN;