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| Reg Message ID and Correlation ID |
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| Aarthi |
 Posted: Thu Jul 16, 2009 4:52 am Post subject: Reg Message ID and Correlation ID |
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Newbie
Joined: 16 Jul 2009
Posts: 1
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Hi,
I m working on SAP Middleware.
In one of our scenarios, a third party software will post Messsage to JMS- MQ Series Queue. The SAP Middleware will pick it and send to the Taget System.
Sometimes, the messages in JMS Queue get lost.
In one sap forum, i saw that, it might happen when correlation id is not unique.
I would like to know how this message id and correlation id are generated in MQ-Series. Can they be redundant.
please let me know how it happens in JMS Queue. |
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| Vitor |
| Posted: Thu Jul 16, 2009 11:25 am Post subject: Re: Reg Message ID and Correlation ID |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| Aarthi wrote: |
I would like to know how this message id and correlation id are generated in MQ-Series. Can they be redundant.
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They're generated by the queue manager (the content is described in the documentation) if requested to do so by the putting application (considered best practice).
Correlation id can be similarly generated, but is more commonly the message id of the message being correlated.
Messages are only "lost" from a JMS queue hosted on a WMQ queue manager if the message permits it. This has been discussed a lot on the forum.
_________________
Honesty is the best policy.
Insanity is the best defence. |
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| gbaddeley |
| Posted: Thu Jul 16, 2009 4:27 pm Post subject: Re: Reg Message ID and Correlation ID |
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Jedi Knight
Joined: 25 Mar 2003
Posts: 2538
Location: Melbourne, Australia
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| Aarthi wrote: |
| Sometimes, the messages in JMS Queue get lost. |
MQ doesn't lose messages, the failure is with the person, who doesn't understand why the message is not where they expect it to be. 
| Quote: |
In one sap forum, i saw that, it might happen when correlation id is not unique.
I would like to know how this message id and correlation id are generated in MQ-Series. Can they be redundant.
please let me know how it happens in JMS Queue. |
MsgId and CorrelId are free-format 24 byte binary fields. They play no role in MQ for "losing" messages. Although messages can appear to be "lost" if, unknowingly, an application gets them from MQ based on some criteria related to MsgId or CorrelId values.
_________________
Glenn |
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