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MQSeries.net Forum Index » General IBM MQ Support » Concurrent MQ Reads

Concurrent MQ Reads

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samird

Posted: Fri May 02, 2003 1:14 am Post subject: Concurrent MQ Reads

Novice

Joined: 10 Apr 2003
Posts: 11
Location: unspecified

I have a program that creates a pool of MQ connections and then creates as many threads as the number of connections.

If each thread then tries to read a message under a syncpoint and does some processing on the messsage, is it guaranteed that 2 different threads won't try to read the same message?.

zpat

Posted: Fri May 02, 2003 2:02 am Post subject:

Jedi Council

Joined: 19 May 2001
Posts: 5866
Location: UK

Yes, multiple threads, processes or even separate instances of the application on the same or different platforms can "compete" for messages on the same queue.

This is a good way to provide scalability, load balancing and fault tolerance for MQ applications. The queue manager will ensure that a given message is not processed by more than one application at the same time.

Your MQGETs should specify a WAIT interval (eg 30 seconds) before repeating the get request - DON'T POLL THE QUEUE. Your application can check for any request to shut itself down in between re-issuing the get requests. Remember to code FAIL_IF_QUIESCING on the MQGET.

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