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MQSeries.net Forum Index » General IBM MQ Support » Messages in Queue

Messages in Queue

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MQGuy2000

Posted: Thu Nov 30, 2006 9:29 am Post subject: Messages in Queue

Centurion

Joined: 20 Jul 2003
Posts: 131

Hello All

I have a question about how MQ behaves under the following condition.

App A is sending messages to App B and waiting for response. Somehow App B is not responding within the timeout period and the App A is getting TimeOut Error.

The message is retained in the Queue. Now if App A sends another message to B and App B responds within the Timeout, will the old (retained) message block App A from GETting the new message? If there are multiple messages retained (say 1000), Will App A have any time lag in getting the good message?

Now that queue is FIFO. Please help me understand. Thanks

special_agent_Queue

Posted: Thu Nov 30, 2006 9:40 am Post subject:

Centurion

Joined: 27 Jul 2006
Posts: 102

Perhaps you should set an expiry on the reply message from B?

MQGuy2000 wrote:

The message is retained in the Queue. Now if App A sends another message to B and App B responds within the Timeout, will the old (retained) message block App A from GETting the new message?

Is app A getting by a correlation ID or some other identifier? Or is it just picking up the first message?

jefflowrey

Posted: Thu Nov 30, 2006 9:41 am Post subject:

Grand Poobah

Joined: 16 Oct 2002
Posts: 19981

If you have read the Application Programming guide, and you have implemented a proper Request/Reply pattern, then the answer to your question is "No."

If you have not implemented a proper request/reply pattern, then the answer to your question is -

It depends on how you wrote your code. But one message never "blocks" another message.
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I am *not* the model of the modern major general.

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