I'm a fan of memcache specifically because ALL it can do is be a cache. No one can come in later and add a distributed queue to it. In-memory caching is also un

I'm a fan of memcache specifically because ALL it can do is be a cache. No one can come in later and add a distributed queue to it. In-memory caching is also underrated, I agree. Using a hashmap and a minuscule TTL (like 5 seconds) can have huge performance benefits depending on your traffic, and it takes like 5 minutes to code up.