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Lost messages (Exercise 5.7)

Verfasst: 21. Aug 2016 09:32
von Jakob
Hello,

I'm having some trouble understanding the concept of lost messages. The current notion I have ist that a message is lost if it was received by a process p, but is not kept, since this process has to roll back to a state prior to the reception.

My question is now (for exercise 5.7):
Why is M3 not a lost message, if a Crash at position B occurs? I seem to remember it has sth to do with P2 not having a checkpoint after send, but I do not quite get it.

Cheers,
Jakob

Re: Lost messages (Exercise 5.7)

Verfasst: 22. Aug 2016 08:53
von Stefan Winter
Hi Jakob,
Jakob hat geschrieben:My question is now (for exercise 5.7):
Why is M3 not a lost message, if a Crash at position B occurs? I seem to remember it has sth to do with P2 not having a checkpoint after send, but I do not quite get it.
me neither. M3 is not a lost message for any combination of checkpoints across its sender and receiver.

Cheers,
Stefan