State Machine Replication Explained: The Rule Behind Every Distributed Database

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State Machine Replication (SMR) is a core principle underpinning distributed systems such as replicated databases, Kafka partitions, and Raft clusters. The fundamental rule is that deterministic replicas, if started in the same state and given the same commands in the same order, will always produce the same result. Developer Tanay Karmarkar published a breakdown of SMR mechanics on his blog, covering key concepts including the deterministic primitive, the replicated log, and exactly-once command application. The explainer aims to make the foundational logic of distributed consensus systems more accessible to engineers and learners.

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