Install the wikimedia mcrouter package and set it up to broadcast DELETE/SET for WANObjectCache.
Make sure the planned routing rules make sense:
{ "pools": { "eqiad-mediawiki": { "servers": [ "10.68.23.25:11211", "10.68.23.49:11211" ] }, "codfw-mediawiki": { "servers": [ "10.68.22.239:11211", "10.68.17.171:11211" ] } }, "routes": [ { "aliases": [ "/eqiad/mw/" ], "route": "PoolRoute|eqiad-mediawiki" }, { "aliases": [ "/eqiad/mw-wan/" ], "route": { "type": "OperationSelectorRoute", "default_policy": "PoolRoute|eqiad-mediawiki", "operation_policies": { "set": "AllFastestRoute|Pool|eqiad-mediawiki", "delete": "AllFastestRoute|Pool|eqiad-mediawiki" } } }, { "aliases": [ "/codfw/mw/" ], "route": "PoolRoute|codfw-mediawiki" }, { "aliases": [ "/codfw/mw-wan/" ], "route": { "type": "OperationSelectorRoute", "default_policy": "PoolRoute|codfw-mediawiki", "operation_policies": { "set": "AllFastestRoute|Pool|codfw-mediawiki", "delete": "AllFastestRoute|Pool|codfw-mediawiki" } } } ] }