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MQSeries.net Forum IndexClusteringDelay in delivery of messages to clustered queues

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exerk
PostPosted: Tue Nov 10, 2020 2:40 am Post subject: Reply with quote

Jedi Council

Joined: 02 Nov 2006
Posts: 6206

Just an observation:
Quote:
MQ Version:
A:9.0.0.8
B: 9.0.0.9
APP1 & APP2: 9.0.0.5
FR1 & FR2: 9.0.0.5

IBM recommends that FR queue managers should be at the highest level in any cluster; Knowledge Centre Article extract below (my emphasis):

"...A partial repository reflects whichever full repository sent it the latest update to a record. As a consequence, you might see the information held by an IBM MQ 9.0 partial repository for new IBM MQ 9.0 attributes changing unexpectedly. The values might change from actual IBM MQ 9.0 information to default values. The changes occur if the full repositories in the cluster are at different levels. Migrate full repositories first to avoid instability..."
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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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gbaddeley
PostPosted: Tue Nov 10, 2020 3:22 pm Post subject: Reply with quote

Jedi

Joined: 25 Mar 2003
Posts: 2195
Location: Melbourne, Australia

I suggest having a closer look at the server where QMC3 is running. It appears something is intermittently impacting the performance of MQ for about 2 seconds, and then MQ quickly catches up with processing the SCTQ in the next 2 seconds.
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hughson
PostPosted: Tue Nov 10, 2020 9:13 pm Post subject: Reply with quote

Padawan

Joined: 09 May 2013
Posts: 1512
Location: Bay of Plenty, New Zealand

rujova wrote:
I am tempted to increase the XBATCHSZ, but in the KC it indicates that it can have a negative impact by delaying the first messages placed in the batch waiting for a commit. I also found old threads that talk about the topic. I don't know what other parameter or configuration could help us reduce those timeout peaks.


You've told us that your messages are non-persistent, so the comment about waiting for a commit does not apply, as non-persistent messages are moved over a channel outside of a transaction (unless you have changed NPMSPEED which I suspect is unlikely).

Do you have some evidence that you haven't mentioned that suggests line turn-around is playing a part in these patterns? Or do you have some other reason for considering increasing the BATCHSZ?

Cheers,
Morag
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Morag Hughson @MoragHughson
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fjb_saper
PostPosted: Wed Nov 11, 2020 8:21 am Post subject: Reply with quote

Grand High Poobah

Joined: 18 Nov 2003
Posts: 20423
Location: LI,NY

Even though your messages are non persistent, it might be of benefit to reset the channel sequence number where you experience the delays...

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bruce2359
PostPosted: Wed Nov 11, 2020 11:02 am Post subject: Reply with quote

Poobah

Joined: 05 Jan 2008
Posts: 8822
Location: US: west coast, almost. Otherwise, enroute.

hughson wrote:
... (unless you have changed NPMSPEED which I suspect is unlikely).

What is the NPMSPEED setting on both ends of the channel? The CLUSRCVR channel def for NPMSPEED will determine the CLUSSDRA/B value.
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