From f5f2233daa1de337e35e7322c60cfb722d043988 Mon Sep 17 00:00:00 2001
From: Aaron Schulz <aschulz@wikimedia.org>
Date: Mon, 24 Feb 2014 13:22:15 -0800
Subject: [PATCH] Avoid key fragmentation in FileBackend

* Make sure that global backends do not prefix the cache keys
  with local wiki IDs for container and file stat entries.
  This causes fragmentation and breaks invalidation.

Change-Id: Ic02d6e41f828dc82cc07c7d24c8af29c46392a9c
---
 includes/filebackend/FileBackendStore.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/includes/filebackend/FileBackendStore.php b/includes/filebackend/FileBackendStore.php
index 9a2ebb7188..16300af3ae 100644
--- a/includes/filebackend/FileBackendStore.php
+++ b/includes/filebackend/FileBackendStore.php
@@ -1565,7 +1565,7 @@ abstract class FileBackendStore extends FileBackend {
 	 * @return string
 	 */
 	private function containerCacheKey( $container ) {
-		return wfMemcKey( 'backend', $this->getName(), 'container', $container );
+		return "filebackend:{$this->name}:{$this->wikiId}:container:{$container}";
 	}
 
 	/**
@@ -1646,7 +1646,7 @@ abstract class FileBackendStore extends FileBackend {
 	 * @return string
 	 */
 	private function fileCacheKey( $path ) {
-		return wfMemcKey( 'backend', $this->getName(), 'file', sha1( $path ) );
+		return "filebackend:{$this->name}:{$this->wikiId}:file:" . sha1( $path );
 	}
 
 	/**
-- 
2.20.1