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Redis is a high-query-performance database. The main use case for it is as a caching layer. Partly due to this fact, data durability isn't of tremendous importance, and the main operating mode is single-node. However, a clustered version was released in 2015. Reading the documentation, it sounds like the intent is more to provide a simple mechanism for transcending simple-node mode than to provide a true distributed database with the kinds of guarantees one would expect (like consistency). Accordingly, the data distribution and primary/replica handling are quite simplistic.

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Old Version of KIP-441

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