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> Keevo solves this by not trying to be cassandra, but be much simpler.

Sounds awfully similar to Riak. :)

I have to say I'm not very familiar with Riak. A quick google makes it look similar in functionality. I'm not sure about speed though, RocksDB is really really fast and storage efficient. We tried out a lot of other embedded KV stores. Also Riak does seem to miss one important feature for us, iterating through the keys in lexical order. We use that a lot to build features on.

Even if this feature was/is available in Riak, I still think this was the better choice for us. Bringing this core component in house has been a real boon in gaining good and more importantly predictable performance for our API.

Iterating through keys is not trivial in Riak, you need a 2i to have that. If you have the manpower to maintain your solution and there are people with performance engineering skill it is probably good. Riak has very predictable performance and it is easy to tune and rock solid system this is why it is used in several healthcare systems and for the game that has the largest player base at the moment as well. The consistent hashing layer on the top of LevelDB which is essentially the foundation of RocksDB makes it super nice system. Anyways, I hope Keevo will be available for us as well.

The "you need 2i to have that" is too heavy.

See yugabyte that does cassandra+keevo+rocksdb+raft

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