Manual:$wgMainWANCache

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<translate> This feature was removed from MediaWiki core in version <tvar name=ver>1.40.0</tvar>.</translate> <translate> Please see <tvar name=page>$wgWANObjectCache</tvar> for an alternative way to use this feature.</translate>

<translate> Cache</translate>: $wgMainWANCache
Main wide area network cache configuration.
<translate> Introduced in version:</translate>	1.26.0 (Gerrit change 187074; git #3a1f8b11)
<translate> Removed in version:</translate>	1.40.0 (Gerrit change 889244; git #39ead04e)
<translate> Allowed values:</translate>	(array)
<translate> Default value:</translate>	see below
<translate> Other settings:</translate> <translate> Alphabetical</translate> \| <translate> By function</translate>

Details

This should be set to a key from $wgWANObjectCaches . If not set at all, it would be set to 'mediawiki-main-default', using an implicit $wgWANObjectCaches entry based on $wgMainCacheType .

To actually broadcast purges to multiple cache servers, it must be set to an appropriate $wgWANObjectCaches entry with purge relayer setup.