From 5b77487e85899adcdb856e358f0ac16b8dbafc9f Mon Sep 17 00:00:00 2001
From: Aaron Schulz <aschulz@wikimedia.org>
Date: Tue, 26 Mar 2013 13:08:41 -0700
Subject: [PATCH] Deferred page_touched update via onTransactionIdle.

* This should reduce deadlocks and lock wait timeouts.

Change-Id: I595bc33d7643e7964d796b1d3da31f7cfab55024
---
 includes/Title.php | 23 +++++++++++++++--------
 1 file changed, 15 insertions(+), 8 deletions(-)

diff --git a/includes/Title.php b/includes/Title.php
index 5ce742c6b6..a40e4445c9 100644
--- a/includes/Title.php
+++ b/includes/Title.php
@@ -4501,23 +4501,30 @@ class Title {
 	 */
 	public function invalidateCache() {
 		global $wgMemc;
+
 		if ( wfReadOnly() ) {
 			return false;
 		}
+
 		$dbw = wfGetDB( DB_MASTER );
-		$success = $dbw->update(
-			'page',
-			array( 'page_touched' => $dbw->timestamp() ),
-			$this->pageCond(),
-			__METHOD__
-		);
+		$conds = $this->pageCond();
+		$dbw->onTransactionIdle( function() use ( $dbw, $conds ) {
+			$dbw->update(
+				'page',
+				array( 'page_touched' => $dbw->timestamp() ),
+				$conds,
+				__METHOD__
+			);
+		} );
 		HTMLFileCache::clearFileCache( $this );
 
 		// Clear page info.
 		$revision = WikiPage::factory( $this )->getRevision();
-		if( $revision !== null ) {
+		if ( $revision !== null ) {
 			$memcKey = wfMemcKey( 'infoaction', $this->getPrefixedText(), $revision->getId() );
-			$success = $success && $wgMemc->delete( $memcKey );
+			$success = $wgMemc->delete( $memcKey );
+		} else {
+			$success = true;
 		}
 
 		return $success;
-- 
2.20.1