On Idempotency Keys - Gunnar Morling

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On Idempotency Keys - Gunnar Morling

In distributed systems, there’s a common understanding that it is not possible to guarantee exactly-once delivery of messages.
What is possible though is exactly-once processing. By adding a unique idempotency key to each message, you can enable consumers to recognize and ignore duplicate messages, i.e. messages which they have received and successfully processed before.

https://www.morling.dev/blog/on-idempotency-keys/