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| pub/sub and message transactionality |
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| jonny |
 Posted: Wed Feb 02, 2005 9:07 am Post subject: pub/sub and message transactionality |
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Acolyte
Joined: 03 Jul 2003
Posts: 57
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Hi,
When using the publication node in WBIMB V5 CSD03 on Solaris, and if there is more than one subscribers to the topic being published, I have noticed that if one of the subsription queues is not available (put inhibited, not authorized , etc) messages will still be put onto the other subscription queues. I have transaction mode of the Input node set to 'Yes', messages for the non available queue went to the DEAD letter queue.
Questions:
1)- How can I achieve all or nothing (transactionality) using pub/sub
2)- Is it a norma behaviour for the publication mode, if it couldn't put a message to one of its subscription queues that the message will go to the DEAD letter queue, even though I have the catch and failure terminals of the input node wired.
Thanks |
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| jefflowrey |
| Posted: Wed Feb 02, 2005 9:14 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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The whole point of pub/sub is that the publisher is independant from the subscribers AND the subscribers are independant from each other.
You can't do what you want with pub/sub.
And you likely should reconsider your design in general. You may be able to accomplish what you appear to want with aggregation rather than pub/sub. But you likely don't want to be doing what you appear to want to do - at least in Broker (workflow may be more suited).
As for your question 2, this is what happens. The publisher puts the message on one queue - the control queue of the publication engine. The publication engine then creates a copy of the message for each registered subscriber. If a subscriber queue is unavailable, that individual subscription message goes to the Dead Letter Queue in normal processes.
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I am *not* the model of the modern major general. |
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