Lost messages (Exercise 5.7)

Jakob
Neuling
Neuling
Beiträge: 4
Registriert: 20. Apr 2016 18:12

Lost messages (Exercise 5.7)

Beitrag von Jakob » 21. Aug 2016 09:32

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

Stefan Winter
Mausschubser
Mausschubser
Beiträge: 57
Registriert: 18. Sep 2009 13:37

Re: Lost messages (Exercise 5.7)

Beitrag von Stefan Winter » 22. Aug 2016 08:53

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

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