}
$dbw = wfGetDB( DB_MASTER );
+ # Avoid excess contention on the same category (T162121)
+ $name = __METHOD__ . ':' . md5( $this->mName );
+ $scopedLock = $dbw->getScopedLockAndFlush( $name, __METHOD__, 1 );
+ if ( !$scopedLock ) {
+ return;
+ }
+
$dbw->startAtomic( __METHOD__ );
$cond1 = $dbw->conditional( [ 'page_namespace' => NS_CATEGORY ], 1, 'NULL' );