Call me maybe: Redis

“Redis is a fantastic data structure server, typically deployed as a shared heap. It provides fast access to strings, lists, sets, maps, and other structures with a simple text protocol. Since it runs on a single server, and that server is single-threaded, it offers linearizable consistency by default: all operations happen in a single, well-defined order. There’s also support for basic transactions, which are atomic and isolated from one another.

Because of this easy-to-understand consistency model, many users treat Redis as a message queue, lock service, session store, or even their primary database. Redis running on a single server is a CP system, so it is consistent for these purposes…”

http://aphyr.com/posts/283-call-me-maybe-redis

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