[RhodesianHunter]

In memory fast key value store.

Great for caching, or anything distributed systems need quick access to.

[markdown]

So, like memcache?

[cortesoft]

It also supports other data structures, like lists, sets, and hashes. Super fast, and probably the best documentation I have ever seen.

[stevoski]

Yes, exactly like memcache.

[BozeWolf]

It can do things memcache can do and way more. Like storing other data types. Persisting storage to disk. Geospatial queries. Pub/sub. Lua scripting.

So, no, they are not interchangeable! Only if you just store keys and strings and do not care about persistence.