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It looks perfect. But there's a caveat here. Like the doc said, acks=all will "wait for the full set of in-sync replicas to acknowledge the record", so what if there's only 1 replica in in-sync replicas only have 1? It , it will have the same effect as acks=1 . (even though we have replication-factor set to 3).

To get the expected durability, users also need to set min.insync.replicas  config correctly. In the doc of min.insync.replicas config:

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