Java Tech Enthusiast
Mar 9, 2025 · Backend Development
Handling Duplicate Messages in Message Queues
Message queues can deliver duplicates under at‑least‑once semantics, so to protect idempotent business logic such as orders and payments you should combine producer‑side idempotence (e.g., Kafka’s enable.idempotence), broker‑side deduplication (e.g., Pulsar), and a consumer‑side guard using unique IDs stored in a database or Redis.
KafkaPulsarconsumer deduplication
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