[rabbitmq-discuss] Trouble with confirms

Tom Anderson tom.anderson at timgroup.com
Mon Jul 29 17:25:36 BST 2013

On 29/07/13 13:40, Matthias Radestock wrote:
> On 29/07/13 13:30, Tom Anderson wrote:
>> On 26/07/13 23:32, Matthias Radestock wrote:
>>> On 26/07/13 18:29, Tom Anderson wrote:
>>>> "The broker will confirm messages once:
>>>> [...]
>>>> * a transient message has reached all its queues
>>>> [...]
>>>> So, if i send a persistent message (delivery mode = 2) to a 
>>>> non-durable
>>>> exchange which routes to a non-durable queue, then i will only get a
>>>> confirmation once the message has been consumed from that queue, 
>>>> right?
>>> Wrong. The behaviour is described in the snippet you quoted above,
>>> i.e. the message gets confirmed once it has reached all the queues it
>>> was routed to.
>> Okay. Just to clarify: the bit of the snippet i quoted that you quoted
>> says "a transient message". I understood that as specifically referring
>> to transient messages, not persistent ones, ie those sent with delivery
>> mode 1 rather than 2. I was asking about persistent messages. Are you
>> telling me that the behaviour for persistent messages is actually the
>> same as that specified for transient messages?
> Messages persistence requires the combination of
> 1) delivery_mode = 2
> 2) routing to a durable queue
> Condition #2 is not met in your case, so the message is not persisted, 
> i.e. it is treated as a transient message.

Aha. I didn't realise, that, thanks.

What i'm looking for is a way to get some sort of feedback at the sender 
when a message has been acknowledged by the consumer. Given that 
transient messages are confirmed as soon as the message has reached the 
queue, and persistent messages are confirmed as soon as they are written 
to disk, am i right in concluding that there is no way to do this with 
confirms? Is there any other mechanism in RabbitMQ that might let me do 

My real goal here is to write a test for an application of ours, to 
assert that it is only acknowledging messages after it has successfully 
processed them, and not immediately on receipt. If anyone has any 
thoughts on how i might be able to do that, i would be very excited to 
hear them!



Tom Anderson | Developer | +44 20 7826 4312 | timgroup.com 

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