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MQSeries.net Forum Index » Clustering » MQ Cluster Channel Flow

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Mark Rosen
PostPosted: Sat Mar 08, 2008 9:50 am    Post subject: MQ Cluster Channel Flow Reply with quote

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Joined: 08 Mar 2008
Posts: 4
We want to user clustering with 6 queue managers
2 of the queue managers will have full repository, call them FM1, FM2
These 2 will also have a cluster queue Q1 defined.
The other 4 qmgrs will have partial repository call them PM1,PM2,PM3,PM4. They do not have a local Q1.
These 4 have the same application that will be putting messages to the Q1(FM1) & Q1(FM2).

We want to use clustering to provide workload balancing and also some failover capabilities. We understand the variety of parameters we can select to control the workload balancing. What we are not clear about is the message routing MQ Clustering performs.
If the Cluster workload process decides that the next message from PM1 is going to go to Q1(FM2) does it always send it via a direct connect channel to FM2 or is routing through FM1 (PM1->FM1->FM2) a possibility that might occur.
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jefflowrey
PostPosted: Sat Mar 08, 2008 9:58 am    Post subject: Reply with quote

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Joined: 16 Oct 2002
Posts: 19981
Clusters form fully connected networks because messages never go by way of the FRs.

So messages from QM1 will always go QM1->FM1 or QM1->FM2 and never QM1->FM1->FM2 or QM1->FM2->FM1.

Unless you make special efforts to cause this to happen.
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vijayaleads
PostPosted: Fri Mar 21, 2008 7:50 am    Post subject: Reply with quote

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Joined: 10 Jan 2008
Posts: 22
Quote:
If the Cluster workload process decides that the next message from PM1 is going to go to Q1(FM2) does it always send it via a direct connect channel to FM2 or is routing through FM1 (PM1->FM1->FM2) a possibility that might occur.


As you said PM1, PM2 and PM3 are your partinal repositories and you always have a Cluster-sender channel defined only for a full reposiotry.
In you case..It should have been defined to FM1 or FM2.
Load balancing algorithm decides which queue to choose for sending the messages in a cluster.
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