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This is based on RocksDB which is "sorted key value" store like LevelDB (HBase, Hypertable etc.) and keep sorting and merging keys while flushing to disk at certain point.

Redis in comparison is a different thing if I'm not wrong.

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It's a valid point - RocksDB can be thought of as the internal backend implementation of the DB. It's the front end API that matters as to whether Redis could fulfill the same purpose.

Why do you need junk then if rocksdb exists?

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