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Is the order of message reception guaranteed?

April 26, 2017guaranteed message reception

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Is the order of message reception guaranteed?

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Yes, but only within one process. If there is a live process and you send it message A and then message B, it’s guaranteed that if message B arrived, message A arrived before it. On the other hand, imagine processes P, Q and R. P sends message A to Q, and then message B to R. There is no guarantee that A arrives before B. (Distributed Erlang would have a pretty tough time if this was required!