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| SyncPoint(UoW) with MQ clustering(Round Robining) |
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| chris boehnke |
 Posted: Mon Dec 08, 2008 6:25 pm Post subject: SyncPoint(UoW) with MQ clustering(Round Robining) |
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Partisan
Joined: 25 Jul 2006
Posts: 369
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Hi Guys,
We have a requirement like this:
There are 3 QMgrs, QM1, QM2 and QM3 are in a cluster called CLUSTER1.
A cluster queue, CLUSTER.QUEUE is defined on both QM2 and QM3.
The source application is connected to QM1 and sending msgs to cluster queue, CLUSTER.QUEUE under SYNPOINT(unit of work) to the destination application. The messages will be round robined between QM2 and QM3.
The destination application is of 2 instances and one instance is listening on QM2 and the other on QM3.
Question:
How the msgs will be handled by the destination application as the msgs are round robining between QM2 and QM3 and the msgs are dependable on each other?.
Is it possible to handle the msgs under Syncpoint when the QMgrs are in cluster(round robining) and multiple instances of the destination application?.
Thanks. |
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| fjb_saper |
| Posted: Mon Dec 08, 2008 7:12 pm Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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| Quote: |
| the msgs are dependable on each other |
Read some documentation on message affinity and why it is not a good design. It does not allow for scalability. There are ways to get around it in the cluster by opening the queue with bind fixed. However the receiver is limited to one instance of the consumer and you can only achieve load balancing per group by closing and reopening the queue. Never a good idea when you want to boost throughput. 
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| Mr Butcher |
| Posted: Mon Dec 08, 2008 11:36 pm Post subject: |
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Padawan
Joined: 23 May 2005
Posts: 1716
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| Quote: |
| Is it possible to handle the msgs under Syncpoint when the QMgrs are in cluster(round robining) and multiple instances of the destination application?. |
MQ is asynchronous. Syncpointing is limited to the "local" unit of Work.
if you put, you have 1 UOW, message gets transmitted between queuemanagers (thats another UOW) and if you get, you have another UOW. For each single UOW that is udner your control (put and get) you can use syncpointing. but you can not make both put and get a single uow.
I do not see how syncpointing will solve your message affinity.
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| Vitor |
| Posted: Tue Dec 09, 2008 1:14 am Post subject: Re: SyncPoint(UoW) with MQ clustering(Round Robining) |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| chris boehnke wrote: |
Question:
How the msgs will be handled by the destination application as the msgs are round robining between QM2 and QM3 and the msgs are dependable on each other?. |
I imagine the destination application will fail as soon as a message arrives without the preceeding one on which it depends.
You can't use workload balancing when you have message affinity. This is why message affinity is so frowned upon.
| chris boehnke wrote: |
| Is it possible to handle the msgs under Syncpoint when the QMgrs are in cluster(round robining) and multiple instances of the destination application?. |
Of course. But the UOW will only span a single message and even if it didn't wouldn't solve your affinity issues as each destination application is only getting half the messages it needs.
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Honesty is the best policy.
Insanity is the best defence. |
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