[zambal]

Bitcask was a storage engine created by basho for their riak db (dynamodb like distributed db).

The other storage engine riak could use was google's levellb.

At the time bitcask was as fast or faster than leveldb for most tasks. This was I think around 2010. I have no idea how it compares with a recent version of rocksdb, but at the time it was pretty fast.

[iampims]

One big limitation of Bitcask is that all keys must fit in memory. Still my favorite format for simple KV.