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We have observed the edge case in the replication failover logic which can cause divergence between logs. This occurs with clean leader election and in spite of the improved truncation logic from KIP-101 . There are also known unclean leader election edge cases that  that KIP-101  did did not address. This KIP proposes a change to the Kafka Replication Protocol, a follow up to KIP-101, that will fix edge cases that lead to log divergence for both clean and unclean leader election configs.

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