global $wgMemc, $wgAttemptFailureEpoch;
$key = wfMemcKey( 'attempt-failures', $wgAttemptFailureEpoch,
- $file->getRepo()->getName(), md5( $file->getName() ), md5( $thumbName ) );
+ $file->getRepo()->getName(), $file->getSha1(), md5( $thumbName ) );
// Check if this file keeps failing to render
if ( $wgMemc->get( $key ) >= 4 ) {