Manual:$wgLocalMessageCache

Message Cache: $wgLocalMessageCache
Directory for local copy of message cache, for use in addition to memcached.
Introduced in version:1.6.0 (r11678)
Removed in version:1.16.0
Allowed values:(path string) or false
Default value:false

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Directory for local copy of message cache, for use in addition to memcached.

See also edit