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Note that there is one caveat: this feature is not available in RocksDB JNI yet, I have filed a RocksDB issue (ticket), and if necessary we can contribute back to RocksDB for this feature.

Update: prefix hashing has been added to JNI: https://github.com/facebook/rocksdb/pull/1109

 

Pros: leverage RocksDB internal feature, which is supposed to be performant.

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