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MQSeries.net Forum IndexIBM MQ API SupportIBM XMS parallel processing

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drajani
PostPosted: Wed Dec 21, 2016 3:17 am Post subject: IBM XMS parallel processing Reply with quote

Newbie

Joined: 21 Dec 2016
Posts: 9

I need to process each message only once - order is not important. For a given queue Q1, to achieve better throughput, I am planning to do as below from C# based application (IBM MQ v8, XMS v2.5)

- Establish single connection.
- Create 5 (configurable) tasks - one transacted session per task.
- Every session's message consumer listens to Q1.
- In OnMessage, session committed after each message processing is successful. If processing fails, session is rolled back and message moved to backout queue.

I would like to confirm below -
1. Does above approach makes sense to achieve higher throughput.
2. Is it guaranteed that each message will be received on only one of the 5 sessions? Could not find relevant documentation if this is a supported behavior.
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fjb_saper
PostPosted: Wed Dec 21, 2016 5:13 am Post subject: Re: IBM XMS parallel processing Reply with quote

Grand Poobah

Joined: 18 Nov 2003
Posts: 19430
Location: LI,NY

drajani wrote:
I need to process each message only once - order is not important. For a given queue Q1, to achieve better throughput, I am planning to do as below from C# based application (IBM MQ v8, XMS v2.5)

- Establish single connection.
- Create 5 (configurable) tasks - one transacted session per task.
- Every session's message consumer listens to Q1.
- In OnMessage, session committed after each message processing is successful. If processing fails, session is rolled back and message moved to backout queue.

I would like to confirm below -
1. Does above approach makes sense to achieve higher throughput.
2. Is it guaranteed that each message will be received on only one of the 5 sessions? Could not find relevant documentation if this is a supported behavior.

#1 Yes you will get higher throughput. Remember to set the sharecvn (1) to get the best throughput.
Session rollback and backout to backout queue / dead letter queue is supposed to be automatic in XMS (i.e. behaves like JMS and you don't have to code for it!
Have fun
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drajani
PostPosted: Wed Dec 21, 2016 7:48 pm Post subject: Reply with quote

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Joined: 21 Dec 2016
Posts: 9

Thanks for your reply. I will check on sharecvn. Agreed separate code is not required for rollback scenarios.

Is #2 a expected behavior ?
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fjb_saper
PostPosted: Thu Dec 22, 2016 2:48 am Post subject: Reply with quote

Grand Poobah

Joined: 18 Nov 2003
Posts: 19430
Location: LI,NY

drajani wrote:
Thanks for your reply. I will check on sharecvn. Agreed separate code is not required for rollback scenarios.

Is #2 a expected behavior ?

yes it is. Remember that you are expected to directly consume the message and not try to browse it first. Let the system handle all of the locking aspects.
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drajani
PostPosted: Thu Dec 22, 2016 3:25 am Post subject: Reply with quote

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Joined: 21 Dec 2016
Posts: 9

OK. Thank you.
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