Exactly-Once

Diagram of a message pipeline with a duplicate filter.

Why Exactly-Once Delivery Requires Idempotence to Work

A deep dive into why exactly‑once delivery semantics depend on idempotent operations, with practical patterns, code samples, and testing strategies.

Illustration of a message broker with duplicate messages being filtered by an idempotent consumer.

Why Exactly-Once Delivery Requires Consumer Idempotency

Exactly-once delivery cannot be guaranteed without making consumers idempotent; this article breaks down the technical reasoning and shows how to implement idempotency in real systems.

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