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Most systems I know which require this just do at-least once on the sending side and dedupe on the receiving side. If you build this into your framework, to applications you have exactly-once barring unbounded partitions and the like.



This works only so long as the receiving side is able to retain all messages (or message ids if those are guaranteed to uniquely reference a given payload). It does not work for outages of unbounded (or otherwise impractical) data size or duration.




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