Comment by lisper
That may well be, but that's a very different question.
That may well be, but that's a very different question.
Yeah, but that just seems like a bizarre definition on which to base the claim that you cannot have exactly-once delivery. Obviously, if you define delivery to preclude de-duplication, then you can't have exactly-once delivery. But you can have something that delivers messages (for some reasonable definition of "delivers") exactly once. It seems weird to define delivery in such a way that such a system does not provide exactly-once delivery.
It explains why most people seem to disagree with you on what "delivery" and "you" mean in this context. For the majority of contexts, "delivery" means that a system responsible for de-duplication receives the message.