Thanks Remo, could you elaborate a little? Which is part of RabbitMQ? The HA 
layer or the message retransmission? I'm currently using qpid. Also, just so 
I'm clear, is it the openstack code or the low-level messaging drivers (rabbit, 
zmq, qpid) that retransmit on message delivery failure?

Thanks!

Sent from my iPhone

> On Oct 13, 2014, at 11:59 PM, Remo Mattei <r...@italy1.com> wrote:
> 
> That is part of RabbitMQ and yes it will resend the msg. 
> 
> Remo 
>> On Oct 13, 2014, at 22:31, Aaron Knister <aaron.knis...@gmail.com> wrote:
>> 
>> Hi Everyone,
>> 
>> I'm building a production-grade cloud where HA is a requirement. I'm 
>> currently working on implementing HA of the messaging layer and am not clear 
>> on what the expectations/assumptions are of the messaging layer regarding 
>> message durability and reliability. I've seen documentation scattered about 
>> that suggests OpenStack makes no assumptions that messages will be delivered 
>> or will need to persist for any period of time 
>> (https://openstack.redhat.com/Highly_Available_Qpid_for_OpenStack).
>> 
>> What's the consequence of RPC message loss within openstack? Is it true that 
>> it will resend messages?
>> 
>> Thanks!
>> 
>> -Aaron
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