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MQSeries.net Forum Index » IBM MQ Java / JMS » MQ issue with PUT

MQ issue with PUT

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velocity

Posted: Sat Jul 25, 2009 5:34 am Post subject: MQ issue with PUT

Centurion

Joined: 30 Nov 2007
Posts: 126

Hi Guys!

On server A theres an alias queue which points to a cluster QL on server B. The replies come back to a reply queue on sever A.

It appears the PUT does not even start until the wait on the reply queue expires. Then the PUT starts and completes successfully.

They are using JAVA/websphere JMS.

Any ideas?

mqjeff

Posted: Sat Jul 25, 2009 1:09 pm Post subject:

Grand Master

Joined: 25 Jun 2008
Posts: 17447

Tell them to stop using the same transaction for both PUT and GET.

fjb_saper

Posted: Sun Jul 26, 2009 2:22 am Post subject:

Grand High Poobah

Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY

In J2EE terms the producer/sender in the request part of the request / reply model cannot participate in the global transaction, due to the asynchronicity of the MQ transportation model.

Request/reply is not synchronous in MQ, it is "quasi" synchronous and participates in the asynchronous model.

This is often times solved by either of the 2 deployment transactional attributes: "requires new" or "not supported" although my personal preference would be "requires new".

Have fun

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