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| MDB backout queue and moving messages |
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| jeevan |
 Posted: Thu Apr 17, 2008 3:33 pm Post subject: MDB backout queue and moving messages |
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Grand Master
Joined: 12 Nov 2005
Posts: 1432
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We had long discussions about thsi a while ago. Our app folds still believe that MQ moves messages when the backout count reaches the BT values. they refer an article published in Dev work. Could somebody help me to understand what exactly the conclusion of the article is trying to say.
I DO NOT THINK MESSAGES ARE MOVED AUTOMATICALLY BY MQ WHEN THE BACKOUT COUNT IN THE MESSAGES REACHES THE THRESHHOLD VALUE to the backout queue.
Thanks a lot
article
http://www-128.ibm.com/developerworks/websphere/library/techarticles/0405_titheridge/0405_titheridge.html |
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| bruce2359 |
| Posted: Thu Apr 17, 2008 6:02 pm Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9471
Location: US: west coast, almost. Otherwise, enroute.
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The URL you posted is about WAS behavior, not MQ.
MQ backout works like this:
The backout count counts the number of times a message has been backed out (MQBACK) into a queue by an application. You can set a backout threshold for a queue - it's a queue attribute.
Your application can inquire on the backout count, compare it to the backout threshold (is the count greater than 0, for example), and do something with the poison message. Typical behavior would be for the application to mqget the poison message (likely in a unit of work), and mqput it to the backout-requeue-queue-name named in the queue definition.
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| fjb_saper |
| Posted: Thu Apr 17, 2008 6:28 pm Post subject: Re: MDB backout queue and moving messages |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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| jeevan wrote: |
We had long discussions about thsi a while ago. Our app folds still believe that MQ moves messages when the backout count reaches the BT values. they refer an article published in Dev work. Could somebody help me to understand what exactly the conclusion of the article is trying to say.
I DO NOT THINK MESSAGES ARE MOVED AUTOMATICALLY BY MQ WHEN THE BACKOUT COUNT IN THE MESSAGES REACHES THE THRESHHOLD VALUE to the backout queue.
Thanks a lot
article
http://www-128.ibm.com/developerworks/websphere/library/techarticles/0405_titheridge/0405_titheridge.html |
This belief may be furthered by the behavior of JMS programs. AFAIK only JMS programs will automatically put to the Backout/DLQ and even for that they need authorization or you will get an exception...
Enjoy 
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