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| WMQI publish/subscribe problems |
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| JohnMetcalfe |
 Posted: Wed Nov 09, 2005 10:06 am Post subject: WMQI publish/subscribe problems |
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Apprentice
Joined: 02 Apr 2004
Posts: 40
Location: Edinburgh, Scotland
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Hi there,
We are hitting a sporadic problem with WMQI pub/sub (we are on WMQI 2.1 CSD3)
Occasionally, the publication seems to stop working i.e no messages arrive on the subscription Q(s), even though the publication flow does not throw any exceptions, the subscriptions are all present and correct in the broker and the broker pub/sub engine also reports no errors - we are requesting report messages from the pub\sub engine via the Report & ReplyToQ fields as follows:
SET OutputRoot.MQMD.Report = MQRO_NAN;
SET OutputRoot.MQMD.ReplyToQ = 'SLI.EXCEPTION_PUBSUB';
Restarting the execution group that contains the publication flow seems to 'fix' the problem. Everything seems to work OK again !!!
We have a number of issues:
1. While this has never happened in production, it has happened numerous times in our final user acceptance test environment, so our confidence level that this will never happen in prod is very low.
2. We can't reproduce the problem at will, so the response we raised to the PMR with IBM was a brush off.
3. Everyone seems to think that implementing a full blown monitoring tool is the soln, but this comes with a load of cost and effort, and all we want to be able to do is to monitor for pub\sub failures.
My question is has anybody else using pub\sub encountered similar problems, and if so what where their thoughts on a solution?
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| jefflowrey |
| Posted: Wed Nov 09, 2005 10:09 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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My suspicion would be that something is causing the publication flow to hang - possibly a poison message..
I would say that you could get some useful information out of the performance stats... but you're using 2.1 which doesn't publish performance stats...
I would certainly start by applying a more recent CSD than 3.
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I am *not* the model of the modern major general. |
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| JohnMetcalfe |
| Posted: Wed Nov 09, 2005 10:42 am Post subject: |
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Apprentice
Joined: 02 Apr 2004
Posts: 40
Location: Edinburgh, Scotland
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Jeff, thanks for this.
We are seeing the message being read off the input Q, and no message turning up in the DL Q, or the specified poinson message Q - all looks like the flow has completd OK. I've asked the support guys to trace the pub flow next time it happens so we can see if the WMQI trace can provide any clues as to what is happening. The problem is normally that it happens at some inconvenient time when we need to have the environment up, so the support guys just restart the execution group rather than try and find out what is going on.
We are planning the move up to WBIMB 5 (in fact we may try and go straight to 6), but I though it might be worth a try to see if anyone else out there in the community had encountered the problems - pub\sub is key to our whole architecture, and its absolutekly key that we have total confidence in it, and can detect when anything does not work as it is intended! |
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| jefflowrey |
| Posted: Wed Nov 09, 2005 10:47 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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It's probably better to go straight to 6.
The migration is supposed to be easier, for one. For two, the environments can fully coexist, so you don't have to provision new hardware, or remove old environments to make way for new ones.
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I am *not* the model of the modern major general. |
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