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Thanks for the comment and look forward to the dedicated blog post :)

Was Riak KV ever considered?

Not as far as I know. We did benchmark a lot of embedded storages before deciding on Rocksdb though.

Wasn't riak, like, less efficient than cassandra ?

What do you mean? I think Riak is much simpler and after tuning it beats Cassandra on the same HW same use case in my anecdotal experience.