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| Load balancing across a Pub/Sub Cluster |
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| michaelod |
 Posted: Wed Mar 09, 2016 8:38 am Post subject: Load balancing across a Pub/Sub Cluster |
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Newbie
Joined: 09 Mar 2016
Posts: 2
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Hi,
I have 3 queue managers set up in a Pub/ Sub Cluster.
There is an application on QM A host that puts messages to a clustered topic on QM B.
The messages published to the topic on B are picked up by a subscription and ultimately consumed by an events processor.
There is an identical subscription set up on QM C along with another instance of the events processor. This means that messages are duplicated.
We can stop this by disabling the events processor on QM C meaning that we have a single point of failure,
We are looking for a way of load balancing the messages across the 2 QM's so that they are only consumed by 1 events processor.
Is this possible? |
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| mqjeff |
| Posted: Wed Mar 09, 2016 8:46 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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If you only want one copy of a published message, you can only have one subscriber.
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| michaelod |
| Posted: Wed Mar 09, 2016 8:52 am Post subject: |
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Newbie
Joined: 09 Mar 2016
Posts: 2
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| mqjeff wrote: |
| If you only want one copy of a published message, you can only have one subscriber. |
Yes I know that.
We have cloned queue managers for High Availibilty purposes.
I was just wondering whether it was possible to balance the load.
E.g. if QM B goes down for any reason, then the events processor on QM C would be able to consume the messages. |
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| fjb_saper |
| Posted: Wed Mar 09, 2016 8:57 am Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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It is possible to balance the load. However you end up consuming a queue and not a topic. You will need a subscription that involves the cluster alias as destination queue manager, and a clustered queue as destination... and more likely than not an administrative subscription!
Remember that with load balancing, there is a good chance of messages being out of sequence, should that matter. Also you will have to run a consumer on each qmgr hosting the destination queue to consume the full set of messages.
With only 3 qmgrs in the mix, not much incentive to use the selective pub/sub with cluster routing...
Have fun 
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