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| clustering workload problem |
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| Ratan |
 Posted: Tue Feb 18, 2003 2:58 pm Post subject: clustering workload problem |
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Grand Master
Joined: 18 Jul 2002
Posts: 1245
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Hi Guys,
I have 3 QMGR (A,B,C) clustered with 'A' as the only cluster repository.
I have queue XXXX defined on Both 'A' and 'B' and shared in the cluster. When I put a message to XXXX from QM 'C', I expect the messages to be load balanced using the default round robin algo, which means 50% of the messages on XXXX at QM 'A' and the remaining on XXXX at B.
But interestingly my XXXX at QM 'A' is getting 75% of the messages and XXXX at QM 'B' is getting only 25% of messages. If I put 3 messages, first 2 go to QM 'A' and the third goes to QM 'B'.
Please let me know what could cause this to happen.
-Thnx Laze |
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| ramires |
| Posted: Fri Feb 21, 2003 1:47 am Post subject: |
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Knight
Joined: 24 Jun 2001
Posts: 523
Location: Portugal - Lisboa
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Hi, not an answer, but I'm having a similar problem.
4 qmgrs in a cluster, qmgrs: A, B, C and D.
A local clusterq with the same name in A B and C. From D I put 30 messages to the clusterq and 1 goes to A, 14 to B and 15 to C.
I don't understand why only one goes to A.
Whats the best aproach to deal with this kind of problems ?
Thanks for any clues
Regards
Joao
Thanks |
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| vennela |
| Posted: Fri Feb 21, 2003 7:29 pm Post subject: |
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Jedi Knight
Joined: 11 Aug 2002
Posts: 4055
Location: Hyderabad, India
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What is the DEFBIND attribute of the cluster Queue?
What are the openOptions you are specifying in your application while accessing your queue?
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Venny |
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| mfeenstra |
| Posted: Wed Mar 05, 2003 8:38 pm Post subject: |
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Novice
Joined: 03 Jul 2002
Posts: 12
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See the Clusters manual pg. 161 http://publibfp.boulder.ibm.com/epubs/pdf/csqzah06.pdf
This is a new section in the manual. It describes the internal load balancing algorithm. It does say that it's "round-robin" however, see step 12 of the algorithm:
12. If more than one remote instance of a queue remains, choose the least recently used channel.
So the algorithm does not always equate to round-robin. If you want to specify an algorithm, you can write a cluster workload balancing exit.
_________________
Matt Feenstra
IBM Certified Specialist - MQSeries |
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| Ratan |
| Posted: Thu Mar 06, 2003 11:54 am Post subject: |
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Grand Master
Joined: 18 Jul 2002
Posts: 1245
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Now it makes some sense. Thanks Matt.
-Laze |
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