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MQSeries.net Forum Index » Clustering » Distribution Messages

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marcelhun
PostPosted: Wed Mar 11, 2015 6:45 pm    Post subject: Distribution Messages Reply with quote

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Joined: 09 Apr 2013
Posts: 11
If MQ Clustering addresses the distribution of messages to input queues on multiple queue managers, what handles the distribution of messages to waiting MQ Get calls for applications running on multiple app servers? Would the load be distributed equally or not?
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Andyh
PostPosted: Thu Mar 12, 2015 1:14 am    Post subject: Reply with quote

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Joined: 29 Jul 2010
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There's no guarantee that the queue manager will distribute messages evenly, and in some cases the queue manager will intentionally NOT spread messages evenly across consumers.
The most obvious example is when passing a non-persistent message to a waiting get (avoiding the queue), where the default behaviour is to try to keep a small number of consumers hot rather then distributing the messages across all consumers (trying to optimize things by keeping the working set smaller).
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marcelhun
PostPosted: Thu Mar 12, 2015 5:41 am    Post subject: Reply with quote

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Joined: 09 Apr 2013
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Andyh wrote:
There's no guarantee that the queue manager will distribute messages evenly, and in some cases the queue manager will intentionally NOT spread messages evenly across consumers.
The most obvious example is when passing a non-persistent message to a waiting get (avoiding the queue), where the default behaviour is to try to keep a small number of consumers hot rather then distributing the messages across all consumers (trying to optimize things by keeping the working set smaller).


Thank you Andyh, very kind to help me understand it.
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