Additional Notes
Why do consumers need idempotency?
Track: Java
Topic: Distributed Resilience
Focus: Message Brokers (Kafka)
Java: Message Brokers (Kafka)
Answer
Because brokers can redeliver the same message and the handler must stay safe.
At-least-once delivery is common in real systems. Idempotent consumers prevent duplicate deliveries from charging twice, refunding twice, or otherwise corrupting state.
At-least-once delivery is common in real systems. Idempotent consumers prevent duplicate deliveries from charging twice, refunding twice, or otherwise corrupting state.
Topics: Distributed Resilience Java Message Brokers (Kafka)