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| Putting message in cluster queue |
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| Rangarajan |
 Posted: Fri Jul 18, 2003 3:36 am Post subject: Putting message in cluster queue |
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Novice
Joined: 01 Aug 2002
Posts: 22
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I have created 3 QMgrs, QM1, QM2 and QM3. QM1 and QM2 are repository Qmgrs and QM3 is a non-repository one.
I have created a queue QL_Q1 with the same name in all the 3 qmgrs.
Now iam trying to put messages in QL_Q1 continuously (say 50 messages at one time). For this I connect to the Queue QL_Q1 in QM1. I find that all the 50 messages are always put in QL-Q1 of QM1. There is no sharing happening and the queues QL_Q1 in QM2 and QM3 always remain empty.
What should i do to do load balancing. Iam new to clustering.
can anyone help me on this.
regards
Rangarajan |
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| oz1ccg |
| Posted: Fri Jul 18, 2003 3:46 am Post subject: |
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Yatiri
Joined: 10 Feb 2002
Posts: 628
Location: Denmark
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To achive workload balancing using MQ clustering you will need a "front-end" QMGR which don't have any queues on it.
The workload balancing algorithm takes first the local queue if any, and after that it look for a remote one. It's all described in the "Queue Manager Clusters" manual.
Another way is to write your own workload balancing exit, which distribute to all the queues, but this is a challange 
I've described how to set a working example up here (more complex):
http://home19.inet.tele.dk/m-invent/cluster_qmc_1.htm
Just my $0.02 
_________________
Regards, Jørgen
Home of BlockIP2, the last free MQ Security exit ver. 3.00
Cert. on WMQ, WBIMB, SWIFT. |
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| EddieA |
| Posted: Fri Jul 18, 2003 6:50 am Post subject: |
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Jedi
Joined: 28 Jun 2001
Posts: 2453
Location: Los Angeles
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MQ will only load balance between cluster queues that are not local.
If there is a local definition of the queue, then it is always used.
Cheers,
_________________
Eddie Atherton
IBM Certified Solution Developer - WebSphere Message Broker V6.1
IBM Certified Solution Developer - WebSphere Message Broker V7.0 |
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| jefflowrey |
| Posted: Fri Jul 18, 2003 7:44 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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| EddieA wrote: |
MQ will only load balance between cluster queues that are not local.
If there is a local definition of the queue, then it is always used. |
As Jørgen Pedersen said, this behavior is overrideable with a custom cluster workload exit. But writing one of those is also not a beginner's task.
Just my $0.02.  |
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| Rangarajan |
| Posted: Sun Jul 20, 2003 9:12 pm Post subject: |
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Novice
Joined: 01 Aug 2002
Posts: 22
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I created one more Qmgr, without any queues in it. I added this Qmgr to the existing Cluster. Now i always put my messages in this Qmgr and i could see that the load balancing taking place perfectly in a round robin way. Subsequent to this i have the following queries.
1. I tried to put 50 messages consequently in a Queue. What i find is all these 50 messages are put in a single queue in a round robin way. For eg. if i have 3 cluster queues, i find that one queue has 50 messages and the rest of the two queues are empty. Is there any way by which i could make the cluster to put 25 messages in one queue and the rest 25 in another queue?
2. For load balancing, is it mandatory that we need a Queue manager without any queues on it.
3. Can anyone please explain the workload exit in a simple way.
Thanks to every one who contributed to my query and special thanks to Jørgen Pedersen
regards
Rangarajan |
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| oz1ccg |
| Posted: Sun Jul 20, 2003 11:48 pm Post subject: |
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Yatiri
Joined: 10 Feb 2002
Posts: 628
Location: Denmark
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Some answers to your questions:
1: When you put messages (and require cluster-workload(CLWL) balancing of the individual messages), you have to open the queue with MQOO_BIND_NOT_FIXED or change the attribute on all the queues to BIND_NOT_FIXED. By default it's BIND_ON_OPEN.
2: yes and no, the queuemanager can host some queues, that don't need to be balanced... So the simple answer is YES you will need it (if you don't code a CLWL exit).
3: There is a supportpack MC76, with a CLWL exit incl. the source:
http://www-3.ibm.com/software/integration/support/supportpacs/individual/mc76.html
But think about it, it's VERY easy to create a loop between QMGRs in the CLWL exit.
Just my $0.02
_________________
Regards, Jørgen
Home of BlockIP2, the last free MQ Security exit ver. 3.00
Cert. on WMQ, WBIMB, SWIFT. |
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