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Your producer call returns instantly, so you assume the message made it, until a broker blip proves you wrong.
What you'll have at the end
A producer with acks=all and idempotence on, proven by killing a broker mid-send with zero messages lost or duplicated
You need
A Kafka cluster with at least three brokers you can restart or kill on command (a local multi-broker setup is enough), a topic with a replication factor of three, and a small script that can call your Kafka client library's producer.
Not covered
How a consumer should handle a message it receives twice, since this recipe only makes sure the producer itself never silently drops or doubles a write.
Leans on
Decide whether a pipeline can tolerate duplicate Kafka messages or needs exactly-once
if your downstream already tolerates a duplicate write, you may not need the full acks=all plus idempotence combination this recipe builds.
Commit Kafka consumer offsets so a crash doesn't skip or repeat messages
this recipe only closes the producer side; a crash on the read side needs its own offset-commit strategy.
Checked 25 Aug 2026
Part of the Apache Kafka cookbook