maintenance/purgeStaleMemcachedText.php

   1 <?php
   2 /**
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2 of the License, or
   6  * (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  16  * http://www.gnu.org/copyleft/gpl.html
  17  *
  18  * @file
  19  * @ingroup Maintenance Memcached
  20  */
  21
  22 require_once( __DIR__ . '/commandLine.inc' );
  23
  24 function purgeStaleMemcachedText() {
  25         global $wgMemc, $wgDBname;
  26         $db = wfGetDB( DB_MASTER );
  27         $maxTextId = $db->selectField( 'text', 'max(old_id)' );
  28         $latestReplicatedTextId = $db->selectField( array( 'recentchanges', 'revision' ), 'rev_text_id',
  29                 array( 'rev_id = rc_this_oldid', "rc_timestamp < '20101225183000'"),  'purgeStaleMemcachedText',
  30                 array( 'ORDER BY' => 'rc_timestamp DESC' ) );
  31         $latestReplicatedTextId -= 100; # A bit of paranoia
  32
  33         echo "Going to purge text entries from $latestReplicatedTextId to $maxTextId in $wgDBname\n";
  34
  35         for ( $i = $latestReplicatedTextId; $i < $maxTextId; $i++ ) {
  36                 $key = wfMemcKey( 'revisiontext', 'textid', $i );
  37
  38                 while (1) {
  39                         if (! $wgMemc->delete( $key ) ) {
  40                                 echo "Memcache delete for $key returned false\n";
  41                         }
  42                         if ( $wgMemc->get( $key ) ) {
  43                                 echo "There's still content in $key!\n";
  44                         } else {
  45                                 break;
  46                         }
  47                 }
  48
  49         }
  50 }
  51
  52 purgeStaleMemcachedText();
  53