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| rcp_mq |
 Posted: Wed Apr 17, 2013 9:38 am Post subject: Cluster message passing |
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Centurion
Joined: 13 Dec 2011
Posts: 133
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My understanding of message flow in clustering is, a message needs to land on SYSTEM.CLUSTER.COMMAND.QUEUE and then on to SYSTEM.CLUSTER.TRANSMIT.QUEUE to be further processed by the FR Qmgrs.
I wish to understand what happens next/before...Could anyone enlighten me on this? I could not find the technicality anywhere, maybe only the gurus know about it. (Is there a concept called 'Dynamic remote queue' there?) |
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| exerk |
| Posted: Wed Apr 17, 2013 10:38 am Post subject: Re: Cluster message passing |
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Jedi Council
Joined: 02 Nov 2006
Posts: 6339
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| rcp_mq wrote: |
My understanding of message flow in clustering is, a message needs to land on SYSTEM.CLUSTER.COMMAND.QUEUE and then on to SYSTEM.CLUSTER.TRANSMIT.QUEUE to be further processed by the FR Qmgrs.
I wish to understand what happens next/before...Could anyone enlighten me on this? I could not find the technicality anywhere, maybe only the gurus know about it. (Is there a concept called 'Dynamic remote queue' there?) |
I assume your question relates to the following in the Info Centre?
| Quote: |
SYSTEM.CLUSTER.COMMAND.QUEUE
Each queue manager in a cluster has a local queue called SYSTEM.CLUSTER.COMMAND.QUEUE. This queue is used to carry messages to the full repository.
The queue manager uses this queue to send any new or changed information about itself to the full repository queue manager and to send any requests for information about other queue managers.
This queue is normally empty. |
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It's puzzling, I don't think I've ever seen anything quite like this before...and it's hard to soar like an eagle when you're surrounded by turkeys. |
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| rcp_mq |
| Posted: Wed Apr 17, 2013 11:04 am Post subject: |
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Centurion
Joined: 13 Dec 2011
Posts: 133
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ok but as far as i know apps should not be using any system queues....
so it is qa : base q = qc or qr : rname = qc ... cluster command queue ... FR qmgr? is there a "Dynamic remote queue" somewhere in there? (i read it in MQ clusters section on some univ website...can't find it now) |
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| Vitor |
| Posted: Wed Apr 17, 2013 11:16 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| rcp_mq wrote: |
| ok but as far as i know apps should not be using any system queues.... |
No application should put directly to any of the SYSTEM queues. The application will refer to the cluster queue & there are any number of posts about how to secure the SCTQ.
| rcp_mq wrote: |
so it is qa : base q = qc or qr : rname = qc ... cluster command queue ... FR qmgr? |
No application should care if it's using an alias queue, a remote queue or a local queue.
| rcp_mq wrote: |
| ... cluster command queue ... FR qmgr? |
Data messages do not use the cluster command queue, which is used exclusively for messages about cluster comfiguration. Likewise data messages do not go to the FR unless addressed there. Command messages go there only because the FR holds the cluster configuration.
| rcp_mq wrote: |
| is there a "Dynamic remote queue" somewhere in there? (i read it in MQ clusters section on some univ website...can't find it now) |
No there isn't. Clustering does not use dynamic queues of any variety.
The site to which you're refering was a "copy" of the WMQv5.2 documentation from the early 1990s. If you can't find it I'm glad they've finally responded to requests to remove it, as it tended to rank higher in the Google results than the IBM documentation!
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Honesty is the best policy.
Insanity is the best defence. |
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| rcp_mq |
| Posted: Wed Apr 17, 2013 11:36 am Post subject: |
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Centurion
Joined: 13 Dec 2011
Posts: 133
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| @Vitor, that answered all my questions. |
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| PeterPotkay |
| Posted: Wed Apr 17, 2013 6:12 pm Post subject: |
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Poobah
Joined: 15 May 2001
Posts: 7717
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| Vitor wrote: |
| rcp_mq wrote: |
| is there a "Dynamic remote queue" somewhere in there? (i read it in MQ clusters section on some univ website...can't find it now) |
No there isn't. Clustering does not use dynamic queues of any variety.
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As of MQ 7.5, MQ Clustering could use dynamic transmission queues if your configuration is set up as such.
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Peter Potkay
Keep Calm and MQ On |
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