The similarity between the two generals problem and exactly-once delivery is quite striking.
First of all:
Exactly-once delivery guarantee is the guarantee that a message can be delivered to a recipient once, and only once.
While having a message be delivered only once by a recipient, is the norm, it is impossible to guarantee it.
The similarity between the two generals problem and exactly-once delivery is quite striking. We again have two parties trying to communicate some intent, with a potential for loss of packages. Where the two generals had to agree on a time to attack, here the two processes have to agree that the second has successfully received the message.
Let’s assume that a protocol exists which guarantees that a recipient receives a message from the sender once and only once. Such a protocol could then solve the two generals problem! Representing the time of the attack as the message, the first general (the sender) would only need to adhere to the protocol for the second general (recipient) to have received the attack time exactly one time. However, since we know that this is not possible, we also know that exactly once is not possible.
In case it’s easier to conceptualize, I’ll try to prove the impossibility of exactly-once using a direct proof. For this, let’s assume:
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In this article, see if there are any differences between software developers and software engineers. What you’re about to read mostly revolves around my personal thoughts, deductions, and offbeat imagination. If you have different sentiments, add them in the comment section, and let’s dispute! So, today’s topic…
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