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One of TiDB authors here. Our design is more similar to Google F1, currently we're focusing on building an independent SQL layer above any transactional KV storage.

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Does there exist any distributed transactional KV storage engine (open source) ?

Yes, currently TiDB works well with HBase. Coming soon. There are alse some distribute transaction layer on HBase.Ex:https://github.com/XiaoMi/themis

So TiDB is similar to the (unfortunately) abandoned FoundationDB SQL Layer, but written in a proper language? Nice :)

Aha! You got it. And we also want to build the distributed kv part in a proper way.

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