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MQSeries.net Forum IndexClusteringRoute a message using MQMD.ReplytoQMGR in a same cluster

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akp101
PostPosted: Thu Jul 19, 2018 1:07 am Post subject: Route a message using MQMD.ReplytoQMGR in a same cluster Reply with quote

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Joined: 18 Jul 2018
Posts: 2

Current Setup:

- We have 3 queue managers in a cluster- Gateway(GWQMGR), base queue managers(QMGR1 and QMGR2).
- Gateway(GWQMGR) have alias queue(XYZ.Q.ALIAS) which is pointing to base queue(XYZ.Q) present on both the QMGR1 and QMGR2.
- If I put message on Gateway(GWQMGR)queue(XYZ.Q.ALIAS), then it is been routed to any of queue managers(i.e. QMGR1 or QMGR2) randomly.

To-be Setup:
- Requirement is to route the message on specific base queue manager(either QMGR1 or QMGR2).
- If I set MQMD.ReplyToQMGR = QMGR1, then message should go to QMGR1 only.

How could I solve above problem?
Will it be feasible/possible to write workload balancing exits on incoming MQMD.ReplyToQMGR?

Also suggest if there is any alternative.

Thanks in advance!!!!
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PeterPotkay
PostPosted: Thu Jul 19, 2018 4:12 am Post subject: Reply with quote

Jedi Council

Joined: 15 May 2001
Posts: 7463

That is not the purpose of the MQMD Reply TO Queue Manager field when sending mesages. Its there to tell the receiver where to send replies to, not for the sender as a means to address the request.

Quote:
Requirement is to route the message on specific base queue manager(either QMGR1 or QMGR2


On your MQOPEN call, populate the Destination Queue Manager Name in the MQOD with the name of the queue manager you want send to. Or leave it blank if you want load balancing to occur if the destination queue is clustered.
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gbaddeley
PostPosted: Sun Jul 22, 2018 3:56 pm Post subject: Reply with quote

Padawan

Joined: 25 Mar 2003
Posts: 1886
Location: Melbourne, Australia

Quote:
Requirement is to route the message on specific base queue manager(either QMGR1 or QMGR2)

Why do you need to do that? It negates some benefits of MQ Clusters, such as automatic load balancing & handling qmgr failure. The base qmgrs should provide identical services for the queue, and it shouldn't matter which one messages go to.
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akp101
PostPosted: Wed Aug 29, 2018 12:04 am Post subject: Reply with quote

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Joined: 18 Jul 2018
Posts: 2

gbaddeley wrote:
Quote:
Requirement is to route the message on specific base queue manager(either QMGR1 or QMGR2)

Why do you need to do that? It negates some benefits of MQ Clusters, such as automatic load balancing & handling qmgr failure. The base qmgrs should provide identical services for the queue, and it shouldn't matter which one messages go to.


Because in base qmgr, MQGET node is waiting for response. It will create issue if message gets routed to another base qmgr.
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exerk
PostPosted: Wed Aug 29, 2018 12:50 am Post subject: Reply with quote

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Joined: 02 Nov 2006
Posts: 5934

The essence of clustering is to remove any affinities - as has been stated by gbaddeley, any application instance should be able to service any 'reply'.

If you really, really need to have a message go back to a particular application instance, then have a differently named reply-to-queue in each base queue manager - but I really, really recommend you do NOT do this.
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hughson
PostPosted: Wed Aug 29, 2018 2:42 pm Post subject: Reply with quote

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Joined: 09 May 2013
Posts: 813
Location: Bay of Plenty, New Zealand

PeterPotkay wrote:
Quote:
Requirement is to route the message on specific base queue manager(either QMGR1 or QMGR2


On your MQOPEN call, populate the Destination Queue Manager Name in the MQOD with the name of the queue manager you want send to. Or leave it blank if you want load balancing to occur if the destination queue is clustered.


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