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| Channel Triggering and Clustering. |
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| duffMan |
 Posted: Thu Aug 15, 2002 2:47 am Post subject: Channel Triggering and Clustering. |
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Voyager
Joined: 03 Jun 2002
Posts: 75
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How does channel triggering work with clustering?
I look at the SYSTEM.CLUSTER.TRANSMISION.QUEUE and notice that it is configured (by default I am assuming) as TRIGGER ON FIRST.
Since there is only one transmission queue for a possible many sender channels, what happens in this scenerio?
* No messages on SYSTEM.CLUSTER.TRANSMIT.QUEUE
* Two Cluster Sender channels, TO.QMGRA and TO.QMGRB, both autodefined.
* QMGRA is not available.
* First message arrives on SYSTEM.CLUSTER.TRANSMIT.QUEUE, this message is bound for QMGRA but sits there because QMGRA is not available and hence the channel TO.QMGRA is in RETRY.
* SYSTEM.CLUSTER.TRANSMIT.QUEUE now has a depth of 1.
* Second message arrives on SYSTEM.CLUSTER.TRANSMIT.QUEUE, this time however it is bound for QMGRB which is available.
* Channel TO.QMGRB is inactive and must be triggered in order to deliver the second message.
What I am experiencing is that the second message just sits on the SYSTEM.CLUSTER.TRANSMIT.QUEUE as the channel TO.QMGRB never gets triggered and I will then see a queue depth of 2.
Has anyone else experienced this?
The obvious quick-fix solution is to never let channels disconnect, and ensure they are started when the queue manager is started. But this also has negative implications.
I am using MQv5.2 CSD04 for AIX 4.3.3.
Thanks,
Jason. |
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| bduncan |
| Posted: Thu Aug 15, 2002 8:10 am Post subject: |
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Padawan
Joined: 11 Apr 2001
Posts: 1554
Location: Silicon Valley
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In all the clustered environments I have worked with, the channels were always-on, so we never ran into this issue. Hmm.. I would have assumed the queue manager would start the appropriate channel regardless of how many messages were on the transmission queue...
_________________
Brandon Duncan
IBM Certified MQSeries Specialist
MQSeries.net forum moderator |
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| udaybho |
| Posted: Thu Aug 15, 2002 10:53 am Post subject: |
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Voyager
Joined: 09 May 2002
Posts: 94
Location: Chicago
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Jason,
I had experience this type of behaviour in past, but in my case both sender and target queue managers were repository queue managers.
Does the QMGRA and QMGRB are Repository Queue Managers also ?
Uday Bhosle |
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| duffMan |
| Posted: Thu Aug 15, 2002 12:27 pm Post subject: |
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Voyager
Joined: 03 Jun 2002
Posts: 75
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QMGRA is a REPOSITORY, QMGRB is not.
Jason. |
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