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In the most popular scenario: replication factor = 3, min.insync.replicas=2, acks=all, we ensure at least 2 replicas acks, which means, we can tolerate 1 replica out-of-sync or down (ex: rolling update) and still make the write process successfully. This keeps availability and durability in Kafka.

Everything is perfect! That make





Note that topics have a setting for the "minimum number" of in-sync replicas that is checked when the producer requests acknowledgment that a message has been written to the full set of in-sync replicas.

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