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From ttmdev <joe.fernan...@ttmsolutions.com>
Subject Re: Virtual Topic not working as expected - defect, or misunderstanding?
Date Wed, 26 Sep 2007 18:43:15 GMT

I am using a recent 5.0 SNAPSHOT and just for grins decided to give your test
a whirl. I followed your steps 1 thru 9 and AMQ worked as it should. No
problema!

If time allows, I'll give 4.1.1 a whirl today and see what happens. 

Regards,
Joe


dantelope wrote:
> 
> I'm going to go ahead and say this a defect in 4.1  Virtual Topics appear
> to have lost the expected functionality of permanent registration -- that
> is, it fails the rule "once I register, give me all messages sent to the
> topic until I unregister". 
> 
> I would love to be proved wrong because we truly need the ability to scale
> consumers by competing for messages on the queue, but if the broker goes
> down and we lose messages until we re-register then something is wrong.  I
> shouldn't have to statically define every single client queue.  That's not
> how it works in durable subscriptions, and it's not how it should work in
> virtual topics.
> 
> Does anyone have a test that counters this?
> 
> 
> James.Strachan wrote:
>> 
>> On 24/09/2007, dantelope <dantelope@gmail.com> wrote:
>>>
>>> The following test produces unexpected results:
>>>
>>> 1) Start a broker with a statically defined destination topic called
>>> VirtualTopic.FOO
>>> 2) Start a consumer listening to Consumer.A.VirtualTopic.FOO
>>> 3) Start a sender and send N messages to VirtualTopic.FOO
>>> 4) Consumer correctly receives N messages.
>>> 5) Kill the consumer process
>>> 6) Stop the broker
>>> 7) Start the broker
>>> 8) Start a sender and send N messages to VirtualTopic.FOO
>>> 9) Start a consumer listening to Consumer.A.VirtualTopic.FOO
>>>
>>> FAIL: the consumer does not receive N messages as expected.
>>>
>>> If I put messages on the topic before stopping the server, then the
>>> consumer
>>> WILL receive the messages on start up.
>>>
>>> Is this my misunderstanding of how Virtual Topics should work, or is
>>> this a
>>> defect I should report?
>> 
>> Are you sending the messages using persistent mode?
>> http://activemq.apache.org/what-is-the-difference-between-persistent-and-non-persistent-delivery.html
>> 
>> If not then its expected behaviour.
>> 
>> Note that to re-enable the consumer each time you need to start the
>> consumer on startup of the broker or add the
>> Consumer.A.VirtualTopic.FOO queue to the startup destinations.
>> 
>> http://activemq.apache.org/configure-startup-destinations.html
>> -- 
>> James
>> -------
>> http://macstrac.blogspot.com/
>> 
>> Open Source SOA
>> http://open.iona.com
>> 
>> 
> 
> 

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