rails/rails — pull request #7913 by mje113 (2012-10-11 19:57:03+00:00)
Title: MemCacheStore's move to dalli as a backend broke :race_condition_ttl support

Sending dalli an expires_in integer that matches the Entry instance's expires_at will invalidate the cached value in Memcache at the same time the Entry is expired. This breaks the ability for Cache#fetch to determine if the :race_condition_ttl has occurred since the value will never make it back from Memcached.