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| WDF |
 Posted: Thu Dec 10, 2009 10:16 am Post subject: Load Balancing between MQClient Servers and MQServer QMGR's |
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Newbie
Joined: 10 Dec 2009
Posts: 2
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| Is it possible to load balance between the WMQClient servers and the WMQServer QMGR's. Currently it appears that the application's XML (residing on the MQClient) is set to basically "failover" to the next QMGR in line if one is not available for whatever reason - the app never resets itself and just keep failing over to the next QMGR - we have six clustered QMGR's that the MQClient Servers(1200 plus) connect to. I have been unable to find any information in regards to this architecture between the two. Any direction or recommendation would great be appreciated. Thanks in advance! |
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| PeterPotkay |
| Posted: Thu Dec 10, 2009 5:39 pm Post subject: |
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Poobah
Joined: 15 May 2001
Posts: 7722
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Yes its possible.
Look at the MQ Clients Manual (Library Link top of this page) and research Client Channel Tables. Specifically the ones in MQ version 7.0 which have the features you want.
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Peter Potkay
Keep Calm and MQ On |
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| WDF |
| Posted: Fri Dec 11, 2009 10:32 am Post subject: |
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Newbie
Joined: 10 Dec 2009
Posts: 2
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| Peter - thanks! I'll research it and get back to this topic. WD |
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| zpat |
| Posted: Fri Dec 11, 2009 12:49 pm Post subject: |
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Jedi Council
Joined: 19 May 2001
Posts: 5866
Location: UK
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Multiple clients pulling from one queue on one queue manager is a very powerful and simple form of load-balancing.
Each client takes messages at it's own rate and if one client fails the others carry on.
Hardware cluster the queue manager and then the need to use CCDTs goes away as it has a single connection IP.
Also no orphaned messages when a queue manager dies. |
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| PeterPotkay |
| Posted: Sat Dec 12, 2009 12:45 pm Post subject: |
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Poobah
Joined: 15 May 2001
Posts: 7722
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| zpat wrote: |
Multiple clients pulling from one queue on one queue manager is a very powerful and simple form of load-balancing.
Each client takes messages at it's own rate and if one client fails the others carry on.
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True. But if the messages are arriving slower than the threads are processing them, there is no guarantee that all the threads will get an equal share of messages at the end of the day. Typically one seems to get a lot more. Not very load balanced in this scenario.
| zpat wrote: |
| Hardware cluster the queue manager and then the need to use CCDTs goes away as it has a single connection IP. |
An app with a tight SLA that connects to the QM to send requests and wait for the replies might not be able to afford to wait for the QM to failover to the alternate node. Having multiple QMs to choose from will provide a greater degree of availability if you use an MQ channel table to choose the QM to connect to. Each of those QMs could/should be hardware clustered or multi instanced to make them individually H.A. as well.
Hardwared clustered / multi instanced QMs in an MQ cluster with load balanced MQ Clients sending requests and multiple MQ Clients pulling from each request queue, now we're talking! Even all on Windows its almost, not quite, as available as z/OS shared queueing with MQ clustering. Certainly new requests will probably enjoy 100% availabilty. The only part that doesn't match up are existing messages on a queue. It will still take a minute or two to failover the H.A. QM, during which time the message is marooned. That is not an issue with shared queueing.
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Peter Potkay
Keep Calm and MQ On |
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| zpat |
| Posted: Sun Dec 13, 2009 1:34 am Post subject: |
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Jedi Council
Joined: 19 May 2001
Posts: 5866
Location: UK
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| Use a mainframe to host the queues and it will never go down. |
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| fjb_saper |
| Posted: Sun Dec 13, 2009 7:28 am Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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| zpat wrote: |
| Use a mainframe to host the queues and it will never go down. |
Never? How do you do scheduled maintenance then?  
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MQ & Broker admin |
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