github.com/upbit/groupcache (go): Package groupcache provides a data loading mechanism with caching and de-duplication that works across a set of peer processes.  Each data Get first consults its local cache, otherwise delegates to the requested key's canonical owner, which then checks its cache or finally gets the data.  In the common case, many concurrent cache misses across a set of peers for the same key result in just one cache fill.
Keywords: expiration|groupcache|ttl-cache