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[RocksDB](https://rocksdb.org/) isn’t a distributed storage system, fwiw. It’s an embedded KV engine similar to LevelDB, LMDB, or really sqlite (though that’s full SQL, not just KV)

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Yes, it's based on the same paper as hbase, IIRC.

To be perhaps overly detailed: Hbase is an open source approximation of bigtable. Bigtable _uses_ leveldb as its per-shard local storage mechanism; Rocks is a clone+extension of leveldb.

Bigtable and hbase are higher level and provide functionality across shards and machines. Level and rocks are building blocks that provide a log-structured merge tree storage and retrieval mechanism.

> Bigtable _uses_ leveldb as its per-shard local storage mechanism

Ah, that's probably what I'm conflating with it then.

Thanks for the information.

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