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MQSeries.net Forum IndexGeneral IBM MQ SupportMsg in Topic Subscription Queue Not Removed after Process

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EricL
PostPosted: Tue Mar 21, 2017 4:27 pm Post subject: Msg in Topic Subscription Queue Not Removed after Process Reply with quote

Apprentice

Joined: 10 Oct 2014
Posts: 33

Hi there,

Noticed a weird thing happened:

1. An application is listening to a topic through subscription queue
2. Normally when a new message come in (come to subscription queue), the message would be processed by application and the message would be moved out of the subscription queue
3. But these days we noticed that even after application processed the message, the message still stuck in subscription queue, so the messages are piling up there.

Strangely, looks like new message still able to come in and the application still able to process new messages, but the subscription queue depth is keep on increasing.

Any advice is welcome.

Thanks
EricL
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hughson
PostPosted: Tue Mar 21, 2017 5:52 pm Post subject: Reply with quote

Yatiri

Joined: 09 May 2013
Posts: 665
Location: Bay of Plenty, New Zealand

If the application has processed the message does that imply it does a browse to start with and then later goes back to destructively get the message? Is it possible that the latter step didn't get run?

Also worth checking that the messages are no pt uncommitted? DIS QS UNCOM
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Morag Hughson @MoragHughson
IBM MQ Technical Education Specialist
MQGem Software
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EricL
PostPosted: Wed Mar 22, 2017 9:56 am Post subject: Reply with quote

Apprentice

Joined: 10 Oct 2014
Posts: 33

Thanks Hughson,

DIS QS() UNCOM shows:

AMQ8450: Display queue status details.
QUEUE(SYSTEM.XXX.YYY.QUEUE)
TYPE(QUEUE) CURDEPTH(2627)
UNCOM(NO)

Looks like there was no uncommitted messages.

Not very sure what do you mean by "If the application has processed the message does that imply it does a browse to start with and then later goes back to destructively get the message?"

How to check and confirm above?

Thanks
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mqjeff
PostPosted: Wed Mar 22, 2017 10:48 am Post subject: Reply with quote

Grand Master

Joined: 25 Jun 2008
Posts: 17166

Maybe the subscription is too narrow for all the messages showing up in the queue - like subscribing to messages with a particular property, and the messages that are piling up don't have a matching property.
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hughson
PostPosted: Wed Mar 22, 2017 10:18 pm Post subject: Reply with quote

Yatiri

Joined: 09 May 2013
Posts: 665
Location: Bay of Plenty, New Zealand

EricL wrote:
Not very sure what do you mean by "If the application has processed the message does that imply it does a browse to start with and then later goes back to destructively get the message?"

How to check and confirm above?
You'll need to talk to the application developer. To ask my question another way, how can the message still be on the queue if you know (as you stated earlier) that the application has processed it?

Cheers
Morag
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Morag Hughson @MoragHughson
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MQGem Software
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EricL
PostPosted: Thu Mar 23, 2017 10:53 am Post subject: Reply with quote

Apprentice

Joined: 10 Oct 2014
Posts: 33

The way to verify the message still in subscription q after process is:

1. A specific message found out in subscription q
2. The same message also found out in a queue used for logging, e.g. all processed messages will be put into that queue for auditing purpose
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Vitor
PostPosted: Thu Mar 23, 2017 11:07 am Post subject: Reply with quote

Grand High Poobah

Joined: 11 Nov 2005
Posts: 24296
Location: Ohio, USA

EricL wrote:
The way to verify the message still in subscription q after process is:

1. A specific message found out in subscription q
2. The same message also found out in a queue used for logging, e.g. all processed messages will be put into that queue for auditing purpose


Perhaps pedantically, that doesn't disprove the scenario my worthy associate outlined. If the application browsed the message off, processed it, logged it and then abended trying to destructively get it, you'd see the situation you have here.
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EricL
PostPosted: Tue Mar 28, 2017 10:20 am Post subject: Reply with quote

Apprentice

Joined: 10 Oct 2014
Posts: 33

Thanks Vitor.

is there anyway to prove your assumption?

Which MQ log should to check?
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Vitor
PostPosted: Tue Mar 28, 2017 10:22 am Post subject: Reply with quote

Grand High Poobah

Joined: 11 Nov 2005
Posts: 24296
Location: Ohio, USA

EricL wrote:
is there anyway to prove your assumption?


Reproduce the problem in test.

EricL wrote:
Which MQ log should to check?


MQ doesn't log application problems. Look in the application log.

Having first verified the application actually logs the kind of error I'm describing above. A distressing number of applications I've encountered over the years take an "oh well, never mind" view of MQ errors.
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