Ok to answer my own question from the docs
Please note that this rule is *not transitive*:
Actor A sends message M1 to actor C
Actor A then sends message M2 to actor B
Actor B forwards message M2 to actor C
Actor C may receive M1 and M2 in any order
Causal transitive ordering would imply that M2 is never received before M1 at
actor C (though any of them might be lost). This ordering can be violated
due to different message delivery latencies when A, B and Creside on
different network hosts, see more below.
On Friday, December 20, 2013 4:26:47 PM UTC, Ryan Tanner wrote:
>
> No. For one, actor A may have a bunch of messages in its mailbox while
> actor B has none, meaning A will have to process all those before
> processing 'x' but B will process 'y' immediately.
>
> On Friday, December 20, 2013 9:08:34 AM UTC-7, Tim Pigden wrote:
>>
>> Hi in the following
>>
>> a ! x
>> b ! y
>>
>> where actor b has
>> receive {
>> case y: Y => a ! y
>> }
>>
>> can I be sure that x will arrive at a before y?
>>
>> Tim
>>
>
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