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| obernard |
 Posted: Thu Jan 11, 2007 6:25 am Post subject: Failover on JMS Destination |
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Newbie
Joined: 11 Jan 2007
Posts: 7
Location: Montréal
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Hi,
I try to figure how can implement a failover with JMS. I use weblogic server without Weblogic JMS Server. I have two QMGRs in MQ Cluster. I use QMGR2 for failover, but I don't know how my MDB's and my session beans can switch on QMGR2, went QMGR1 goes down.
thanks for your help!
Olivier |
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| jefflowrey |
| Posted: Thu Jan 11, 2007 6:28 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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Fail over the WebLogic Server at the same time.
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| Vitor |
| Posted: Thu Jan 11, 2007 6:30 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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There are endless posts in the Clustering section about MQ Cluster as failover, and why it's at best a limited solution. At worst it's a nightmare.
Have a browse. 
To answer your specific question, if you're using client connections you can code to reconnect on failure to a list of queue managers. So when QMGR1 goes down, the connection is lost, your code reconnects and finds only QMGR2.
If, however, you're using the cluster as it's intended to be used (for workload balancing) and putting via a gateway then you're code can't see which queue manager is in use. Please see my comments above regarding "MQ Clustering - it's not a failover solution".
My 2 cents. Other points of view may be valid.
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| Vitor |
| Posted: Thu Jan 11, 2007 6:31 am Post subject: |
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Grand High Poobah
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| jefflowrey wrote: |
| Fail over the WebLogic Server at the same time. |
Wouldn't that require failover software to detect the fall of the queue manager? 
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| jefflowrey |
| Posted: Thu Jan 11, 2007 6:35 am Post subject: |
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Grand Poobah
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| Vitor wrote: |
| jefflowrey wrote: |
| Fail over the WebLogic Server at the same time. |
Wouldn't that require failover software to detect the fall of the queue manager? |
You can't switch MDBs otherwise. You'd have to restart the MDB Listener port but have it use a different QCF, and likewise the session beans would have to know to switch to a different QCF.
The requirements require failover software.
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| Vitor |
| Posted: Thu Jan 11, 2007 6:41 am Post subject: |
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Joined: 11 Nov 2005
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| jefflowrey wrote: |
| The requirements require failover software. |
I always enjoy being in furious agreement with you 
obernard - I refer you again to the Clustering section where this debate rages intermittently. To give you a soundbite of my position:
"MQ Clusters are for load balancing. Failover software is for failing over".
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| obernard |
| Posted: Thu Jan 11, 2007 6:55 am Post subject: |
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Newbie
Joined: 11 Jan 2007
Posts: 7
Location: Montréal
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Thanks everybody,
I know that MQ Cluster is for load balancing, but it's an enterprise decision. I'm not agree with that but I don't have a word to tell on this.
However, cluster or not, I have the same problem. It is possible to swith an MDB from a QMGR1 to QMGR2 transparently? If JMS can't, how can I do this?
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| Vitor |
| Posted: Thu Jan 11, 2007 7:03 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| obernard wrote: |
| It is possible to swith an MDB from a QMGR1 to QMGR2 transparently? |
As per jefflowrey above, no.
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| fjb_saper |
| Posted: Thu Jan 11, 2007 9:25 pm Post subject: |
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Joined: 18 Nov 2003
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| Vitor wrote: |
| obernard wrote: |
| It is possible to swith an MDB from a QMGR1 to QMGR2 transparently? |
As per jefflowrey above, no. |
Not with WebSphere MQ.
However you should verify whether this is possible with the WebSphere JMS Engine (New to 6.0)
Enjoy 
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| jefflowrey |
| Posted: Fri Jan 12, 2007 3:00 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
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| fjb_saper wrote: |
| As per jefflowrey above, no. |
Not with WebSphere MQ.
However you should verify whether this is possible with the WebSphere JMS Engine (New to 6.0)
Enjoy [/quote]
FJ - you would have to change what QCF the Listener Port uses.
Yes, the messaging engine might fail over from node 1 to node 2, transparently, but that's not the same thing.
I guess it's possible the QCF could have more than one messaging engine listed...
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