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MQSeries.net Forum Index » IBM MQ Java / JMS » Guarantee ordering across topics

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JohnRodey
PostPosted: Tue Mar 11, 2008 1:29 pm    Post subject: Guarantee ordering across topics Reply with quote

Centurion

Joined: 13 Apr 2005
Posts: 103
This question pertains to pub/sub environment.

I would like to create a subscribing process who subscribes to two different topics (TopicA and TopicB). Is there a way with WebSphereMQ to ensure that my process will receive messages in time order between each of the topics. No matter how backed up one topic is vs. the other, if a message is published first to TopicA and a second message is published to TopicB, I need to be sure that my subscribing client gets TopicA's message first since it was posted first.

I understand that the JMS specification states that this funtionality is not guaranteed by any vendor but I know that some products do offer this functionality.
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jefflowrey
PostPosted: Tue Mar 11, 2008 1:39 pm    Post subject: Reply with quote

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Joined: 16 Oct 2002
Posts: 19981
If you subscribe both topics to the same physical queue, and you don't use message priority on the topics and you take a bit of additional care with configuration of any channels between the pub/sub engine and the subscriber queue manager...

Then messages should be delivered to the topic consumer in queue order, which should relate to publication time.

You'll be hard pressed to get a guarantee on that, though, I think.
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