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MQSeries.net Forum IndexClusteringUniform Cluster how to set applname(s) in queue manager

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bruce2359
PostPosted: Thu Oct 15, 2020 12:52 pm Post subject: Uniform Cluster how to set applname(s) in queue manager Reply with quote

Poobah

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

Darned if I can recall or find the specifics of how to set at the Uniform Cluster queue manager(s) the name or names of applications to be balanced.

I find lots of ways to specify application name in CNO or JNDI or otherwise programmatically. One reference said 'administratively' on the client.ini or environment variable.

Have I misunderstood? If an MQ Client app connects to a qmgr via one of the possibilities in the JSON CCDT, is that what prompts the Unified Cluster magic to begin balancing that application name?

I'm looking at v9.1.4 doc https://www.ibm.com/support/knowledgecenter/SSFKSJ_9.1.0/com.ibm.mq.pla.doc/q132762_.htm

Anyone?
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hughson
PostPosted: Thu Oct 15, 2020 10:50 pm Post subject: Reply with quote

Padawan

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I think it is connecting to the Queue Manager Group name in the CCDT that means it will be balanced - nothing to do with providing an ApplName, as it will just use the executable name if you don't supply one, and can still be balanced then too.

Your CCDT must have both the set of queue managers using QMNAME(group-name) and then again with QMNAME(qmgr-name).

This blog post might help?

Walkthrough: Auto application rebalancing using the Uniform Cluster pattern

Cheers,
Morag
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tczielke
PostPosted: Fri Oct 16, 2020 1:01 pm Post subject: Reply with quote

Sentinel

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Based on that link, it is the MQCNO_RECONNECT option that is the switch that says an application should be rebalanced in a uniform cluster.

Quote:
We're using this sample because it is a client connected app that connects using the CNO option MQCNO_RECONNECT. In terms of Uniform Clusters this CNO option should be treated as the 'magic switch' to tell the queue manager that this application instance is willing to be rebalanced to another queue manager in the cluster.

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bruce2359
PostPosted: Fri Oct 16, 2020 2:06 pm Post subject: Reply with quote

Poobah

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My pondering was/is: how does the Uniform Cluster queue manager know which applications to redistribute? If its MQCNO_RECONNECT, then any/all apps that specify it will be distributed. I thought I recalled a server-side list of apps that limit redistribution.
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hughson
PostPosted: Fri Oct 16, 2020 8:34 pm Post subject: Reply with quote

Padawan

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Location: Bay of Plenty, New Zealand

tczielke wrote:
Based on that link, it is the MQCNO_RECONNECT option that is the switch that says an application should be rebalanced in a uniform cluster.

Quote:
We're using this sample because it is a client connected app that connects using the CNO option MQCNO_RECONNECT. In terms of Uniform Clusters this CNO option should be treated as the 'magic switch' to tell the queue manager that this application instance is willing to be rebalanced to another queue manager in the cluster.


Feels like it has to be both MQCNO_RECONNECT AND connection to a group of queue managers. It wouldn't make sense to rebalance an application that was deliberately connecting to a specific queue manager and asking for reconnect.

Cheers,
Morag
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fjb_saper
PostPosted: Sat Oct 17, 2020 12:18 am Post subject: Reply with quote

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hughson wrote:

Feels like it has to be both MQCNO_RECONNECT AND connection to a group of queue managers. It wouldn't make sense to rebalance an application that was deliberately connecting to a specific queue manager and asking for reconnect.

Cheers,
Morag
Yes that works. The Client application name is for when you want to check how your application is being load balanced. On the other hand, for your application to be correctly load balanced you need at a minimum the number of instances to match the number of possible running targets. Preferably run twice that number of instances...
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tczielke
PostPosted: Sat Oct 17, 2020 4:24 am Post subject: Reply with quote

Sentinel

Joined: 08 Jul 2010
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Location: Illinois, USA

hughson wrote:
tczielke wrote:
Based on that link, it is the MQCNO_RECONNECT option that is the switch that says an application should be rebalanced in a uniform cluster.

Quote:
We're using this sample because it is a client connected app that connects using the CNO option MQCNO_RECONNECT. In terms of Uniform Clusters this CNO option should be treated as the 'magic switch' to tell the queue manager that this application instance is willing to be rebalanced to another queue manager in the cluster.


Feels like it has to be both MQCNO_RECONNECT AND connection to a group of queue managers. It wouldn't make sense to rebalance an application that was deliberately connecting to a specific queue manager and asking for reconnect.

Cheers,
Morag


Yes, I agree that if you want an application to use this uniform cluster capability, you will want to use the connection to a group of queue managers for it to work properly. However, what if you have a scenario where you have two separate applications that 1) set the MQCNO_RECONNECT option 2) connect to queue managers QM1 and QM2 and 3) you only want one of the applications to participate in the uniform cluster. How would you get that to work? In other words, how would you tell the other application "I know you are turning yourself on for UC with the MQCNO_RECONNECT option, but I really want you to be off for UC." This may be the crux of Bruce's question. I don't know the answer myself, I just started doing a POC on this uniform cluster functionality yesterday.
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fjb_saper
PostPosted: Sun Oct 18, 2020 6:30 am Post subject: Reply with quote

Grand High Poobah

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tczielke wrote:

Yes, I agree that if you want an application to use this uniform cluster capability, you will want to use the connection to a group of queue managers for it to work properly. However, what if you have a scenario where you have two separate applications that
  1. set the MQCNO_RECONNECT option
  2. connect to queue managers QM1 and QM2 and
  3. you only want one of the applications to participate in the uniform cluster.
How would you get that to work? In other words, how would you tell the other application "I know you are turning yourself on for UC with the MQCNO_RECONNECT option, but I really want you to be off for UC." This may be the crux of Bruce's question. I don't know the answer myself, I just started doing a POC on this uniform cluster functionality yesterday.


If you set the reconnect option to only reconnect to the same qmgr, I believe you will exclude the application from load balancing. If the queues used in QM1 and QM3 only exist in QM1 and QM3 and not say in QM2 and QM4 your application should only load balance between QM1 and QM3. It should be easy to verify this last assumption in your POC.
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bruce2359
PostPosted: Sun Oct 18, 2020 10:44 am Post subject: Reply with quote

Poobah

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tczielke wrote:
This may be the crux of Bruce's question.

Indeed.

Or more broadly: How do I market UC to my clients? At this point, UC seems to be a niche solution.

No Redbook so far. Some how-to's to implement. Cool 9.1.5 auto-configure.

Some of the guidelines cobbled from available doc, and paraphrased here:
- no more than 10 queue managers in a UC
- very similarly provisioned and configured
- UC qmgr group deployed should be limited by app type
- apps should be a balance of PUTers and GETers
- no qmgr or msg affinities
- best for apps with long connect time

Perhaps a separate UC for app type.

While not explicitly stated (that I can find) is IBM's move toward cloud-flavored deployment - with Liberty or similar - just-in-time to meet demand. UC seems to fit this model.
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