ArchitectArchitect (10+ yrs)RedisKafkaSystem DesignLinkedInUberNetflix
Exactly-once delivery myth
Why is end-to-end exactly-once processing hard, and what do you do instead?
Answers use simple, clear English.
Quick interview answer
Networks fail and retries duplicate messages. True exactly-once across systems needs idempotent consumers, dedupe keys, transactional outbox, and careful producer semantics. Prefer at-least-once + idempotency.
Detailed answer
Networks fail and retries duplicate messages. True exactly-once across systems needs idempotent consumers, dedupe keys, transactional outbox, and careful producer semantics. Prefer at-least-once + idempotency. Kafka 'exactly-once' is within its transactional scope, not magic across all side effects.
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