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MQSeries.net Forum IndexGeneral IBM MQ SupportMQ PUB SUB and COA with delayed PUT times

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zrux
PostPosted: Fri Jul 03, 2020 12:02 am Post subject: MQ PUB SUB and COA with delayed PUT times Reply with quote

Apprentice

Joined: 21 May 2006
Posts: 27
Location: UK

Has anyone seen issues with MQ PUTs getting delayed when trying to PUT messages to a split queue using PUB SUB and also asking for a COA

The PUB SUB is splitting the messages to 3 Qs (one local, 2 remote Qs on 2 different customer envs)

We have MQ puts for many other Queues where the same application is using the same SVRCONN to PUT the messages but its not seeing the delays and they don't have MQ PUB SUB/ application asking for COAs.


Also its been noticed that this delay happens when there has been a long period of in-activity.

So any pointers which could be the issue..PUB SUB or asking for COA/something else which could cause the delay in PUTs...?
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bruce2359
PostPosted: Fri Jul 03, 2020 4:05 am Post subject: Re: MQ PUB SUB and COA with delayed PUT times Reply with quote

Poobah

Joined: 05 Jan 2008
Posts: 8741
Location: US: west coast, almost. Otherwise, enroute.

zrux wrote:
The PUB SUB is splitting the messages to 3 Qs (one local, 2 remote Qs on 2 different customer envs)

If the request/reply/COA message flow across Sender/Receiver channels to the different customers, it's possible that the channel(s) have disconnected due to inactivity. Investigate channel attributes DisconnectInterval and BatchSize, as these can affect latency.
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hughson
PostPosted: Sun Jul 05, 2020 8:41 pm Post subject: Reply with quote

Grand Master

Joined: 09 May 2013
Posts: 1464
Location: Bay of Plenty, New Zealand

As has already been stated, the delay may be as a result of the return route channels having to start up - can you confirm whether they are trigger started?

Also, what sort of delay are you seeing? A few seconds/minutes/hours/days?

Do the COAs turn up eventually or never?

Cheers,
Morag
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bruce2359
PostPosted: Sun Jul 05, 2020 9:16 pm Post subject: Reply with quote

Poobah

Joined: 05 Jan 2008
Posts: 8741
Location: US: west coast, almost. Otherwise, enroute.

Do the COAs end up in a DLQ somewhere?
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hughson
PostPosted: Sun Jul 05, 2020 10:35 pm Post subject: Re: MQ PUB SUB and COA with delayed PUT times Reply with quote

Grand Master

Joined: 09 May 2013
Posts: 1464
Location: Bay of Plenty, New Zealand

zrux wrote:
Has anyone seen issues with MQ PUTs getting delayed ...

... which could cause the delay in PUTs...?

I've just noticed that I have misread your original question. I read it as the COAs were getting delayed, but I have just re-read it and notice that you are actually saying the MQPUTs are delayed.

Please could you clarify - are you saying that the MQPUT call takes a long time to return? Is it an MQPUT or an MQPUT1? How long a delay are you talking about?

Cheers,
Morag
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Morag Hughson @MoragHughson
IBM MQ Technical Education Specialist
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