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| Trigger type = F |
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| giuly020277 |
 Posted: Mon Mar 09, 2009 4:58 am Post subject: Trigger type = F |
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Centurion
Joined: 07 Aug 2007
Posts: 146
Location: Florence,Italy
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Hello,
on zos i have a locale queue with trigger = First.
trigger let start a transaction called DALL.
On queue many application put messages (both batch and online).
At the beginning a batch put 1000 messages on queue.
Trigger starts DALL who get messages (one at time). In this while...many online application put messages that are stored on queue.
In this scenario i was waiting to see ONLY ONE DALL that get all messages. Instead i have seen that more than one dall is runned. WHY?
I have trigger = FIRST.   |
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| giuly020277 |
| Posted: Mon Mar 09, 2009 5:10 am Post subject: |
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Centurion
Joined: 07 Aug 2007
Posts: 146
Location: Florence,Italy
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it is possibile a scenario like that :
- 1 dall is running and is getting all messages /who have priority =0) ;
- in the while a messages with priority =4 come on queue .
What happen?It's possibile dall stop and start another one to get this message with highest priority?  |
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| Vitor |
| Posted: Mon Mar 09, 2009 5:34 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| giuly020277 wrote: |
| It's possibile dall stop and start another one to get this message with highest priority? |
The application should be given the higher priority message the next time it reads the queue; one of the reasons message affinity is not a good idea (because it would break up the chunk of 1000 messages in your example).
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| Vitor |
| Posted: Mon Mar 09, 2009 5:35 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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Of course, if you've got some funky coding in your application it could do anything..... 
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| PeterPotkay |
| Posted: Thu Mar 12, 2009 7:51 pm Post subject: |
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Poobah
Joined: 15 May 2001
Posts: 7722
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Because your app is reading one message and closing the queue. Since there are more than 0 messages on the Trigger On First queue, another trigger message is generated. This happens as soon as the q is closed. The 2nd instance is probably already trigered and running before the first instance finishes ending after closing the q.
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Peter Potkay
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