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From "James Strachan" <james.strac...@gmail.com>
Subject Re: Queue question
Date Thu, 01 Feb 2007 20:08:52 GMT
Persistence v non persistence only applies to what happens to messages
if you reboot the broker; otherwise the semantics are pretty similar.

If you don't want a message to be sent to consumers which are not
there, don't use a queue, use a topic.


On 2/1/07, GaryG <ggiventa@us.ibm.com> wrote:
>
> I'm doing some simple communication between two peers via a Queue, and I'm
> noticing odd persistence behavior.
>
> Even though both the producer is set with DeliveryMode.NON_PERSISTENT, what
> I see happen is this:
>
> 1) Bring up AMQ broker
> 2) Bring up Producer and send 5 test messages.  At this point the consumer
> of the messages for this Q is not even running.
> 3) Bing up Consumer and it receive the 5 messages.
>
> I've tried setting TTL on the Producer to something really short, but that
> didn't help.
>
> This seems wrong to me, as I would only expect the messages to be delivered
> to the consumer of the Q if the consumer was A) actually running, or B)
> there was persistence turned on.
>
> If I use a Topic instead, the above scenario works as expected, and I only
> get the missed messages if I turn on persistence.
>
> What am I missing?
>
> Perhaps I'm not grasping what persistence is and how it should work?  I
> understand the messages persisted to a DB for backup, how is that different
> from journaling?  If I want delivery assurance, even if a consumer is down,
> do I have to turn on DeliveryMode.PERSISTENT on the producer, AND use a
> DurableSubscriber on the consumer end?
>
> I appreciate any help!
>
> -GaryG
> --
> View this message in context: http://www.nabble.com/Queue-question-tf3157001.html#a8755070
> Sent from the ActiveMQ - User mailing list archive at Nabble.com.
>
>


-- 

James
-------
http://radio.weblogs.com/0112098/

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