objectcache: add WANObjectCacheReaper for assuring purges

[lhc/web/wiklou.git] / includes / DefaultSettings.php

diff --git a/includes/DefaultSettings.php b/includes/DefaultSettings.php
index 086b615..58ddb69 100644 (file)
--- a/includes/DefaultSettings.php
+++ b/includes/DefaultSettings.php
@@ -2342,6 +2342,19 @@ $wgWANObjectCaches = [
        */
 ];
 
+/**
+ * Verify and enforce WAN cache purges using reliable DB sources as streams.
+ *
+ * These secondary cache purges are de-duplicated via simple cache mutexes.
+ * This improves consistency when cache purges are lost, which becomes more likely
+ * as more cache servers are added or if there are multiple datacenters. Only keys
+ * related to important mutable content will be checked.
+ *
+ * @var bool
+ * @since 1.29
+ */
+$wgEnableWANCacheReaper = false;
+
 /**
  * Main object stash type. This should be a fast storage system for storing
  * lightweight data like hit counters and user activity. Sites with multiple