[Openstack] Messaging reliability/durability expectations

Aaron Knister aaron.knister at gmail.com
Tue Oct 14 20:51:08 UTC 2014

(Tested in icehouse)

On Tue, Oct 14, 2014 at 4:50 PM, Aaron Knister <aaron.knister at gmail.com>

> 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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