https://devops-monk.com/tags/idempotent/Recent content in Idempotent on Devops MonkHugoen-usMon, 04 May 2026 00:00:00 +0000https://devops-monk.com/tutorials/spring-kafka/idempotent-producer/Mon, 04 May 2026 00:00:00 +0000https://devops-monk.com/tutorials/spring-kafka/idempotent-producer/The Duplicate Problem With acks=all and retries enabled, a produce request might be acknowledged by the broker, but the acknowledgment is lost in the network before reaching the producer. The producer, seeing no response, retries — sending the same record again. The broker writes it a second time. The consumer sees a duplicate. sequenceDiagram participant Producer participant Leader as Broker (Leader) Producer->>Leader: ProduceRequest: OrderPlaced (orderId=1001) Leader->>Leader: Write record at offset 42 ✓ Leader--xProducer: ProduceResponse LOST (network failure) Note over Producer: No ack received — retrying Producer->>Leader: ProduceRequest: OrderPlaced (orderId=1001) [RETRY] Leader->>Leader: Write record at offset 43 ✓ (DUPLICATE!