[Openstack] Messaging reliability/durability expectations

Aaron Knister aaron.knister at gmail.com
Tue Oct 14 20:50:53 UTC 2014

For those of you following alone at home--  I just discovered that durable
queues are particularly nice for nova scheduler. Without them an outage of
either the MQ daemon (qpid in my case) or the scheduler itself can cause
the scheduling requests to get dropped on the floor. With durability the
instance gets scheduled when the broker or the scheduler come back to life.

On Tue, Oct 14, 2014 at 3:32 PM, Gordon Sim <gsim at redhat.com> wrote:

> On 10/14/2014 07:36 PM, Aaron Knister wrote:
>> With RabbitMQ if a message is silently dropped by the broker will a
>> timeout still occur/exception be raised because no reply/ack was received?
>> With the QPID driver the automatic ack()'s Sandy mentioned don't occur?
>> Will the sender eventually become aware that a message was lost? I'll
>> take a timeout over a silent message drop any day.
> Yes, for an RPC 'call' (i.e. not a cast, which has no reply) the call will
> block until the response is received or the timeout expires. In the latter
> case an exception is raised. This is independent of which driver is used.
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