[Spread-users] What are "CAUSAL" messages?

Ben Laurie ben at algroup.co.uk
Fri Jul 19 14:22:11 EDT 2002

Ned Konz wrote:
> This may be a stupid question, but I haven't seen it answered 
> anywhere:
> What is a Causal message, and why or when would I want one?
> I understand that it is a kind of ordering guarantee, but I don't 
> understand what the ordering is or when it matters.

Causal means that if anyone receives message A before they send message 
B, then everyone is guaranteed to also get A before B (i.e. causal 
ordering, in the physics sense, is preserved).



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