maintenance/purgeStaleMemcachedText.php

   1 <?php
   2
   3 require_once( dirname( __FILE__ ) . '/commandLine.inc' );
   4
   5 function purgeStaleMemcachedText() {
   6         global $wgMemc, $wgDBname;
   7         $db = wfGetDB( DB_MASTER );
   8         $maxTextId = $db->selectField( 'text', 'max(old_id)' );
   9         $latestReplicatedTextId = $db->selectField( array( 'recentchanges', 'revision' ), 'rev_text_id',
  10                 array( 'rev_id = rc_this_oldid', "rc_timestamp < '20101225183000'"),  'purgeStaleMemcachedText',
  11                 array( 'ORDER BY' => 'rc_timestamp DESC' ) );
  12         $latestReplicatedTextId -= 100; # A bit of paranoia
  13
  14         echo "Going to purge text entries from $latestReplicatedTextId to $maxTextId in $wgDBname\n";
  15
  16         for ( $i = $latestReplicatedTextId; $i < $maxTextId; $i++ ) {
  17                 $key = wfMemcKey( 'revisiontext', 'textid', $i );
  18
  19                 while (1) {
  20                         if (! $wgMemc->delete( $key ) ) {
  21                                 echo "Memcache delete for $key returned false\n";
  22                         }
  23                         if ( $wgMemc->get( $key ) ) {
  24                                 echo "There's still content in $key!\n";
  25                         } else {
  26                                 break;
  27                         }
  28                 }
  29
  30         }
  31 }
  32
  33 purgeStaleMemcachedText();
  34