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| Is there any known problem related to MQ segmentation....? |
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| Maximus |
 Posted: Tue Apr 11, 2006 4:10 pm Post subject: Is there any known problem related to MQ segmentation....? |
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Acolyte
Joined: 14 Jun 2004
Posts: 57
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Hi Everyone
I need the advice of MQ experts...
Is there any known problem related to MQ segmentation or it's pretty much bullet proof?
I want to include the following code to support segmentation and the client is worried that it may cause some problems if more then one program is putting or getting messages at the same time on the same queue:
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The only changes necessary for these applications are for the putting application to
authorize the queue manager to perform segmentation if necessary,
PMO.Options = (existing options)
MQPUT MD.MsgFlags = MQMF_SEGMENTATION_ALLOWED
and for the getting application to ask the queue manager to reassemble the
message if it has been segmented:
GMO.Options = MQGMO_COMPLETE_MSG | (existing options)
MQGET
=======================================================
Thanks for your advices... |
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| jefflowrey |
| Posted: Tue Apr 11, 2006 4:38 pm Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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As far as I understand it, IBM puts it's full faith behind it's products.
That means that if you can demonstrate a case where the product does not work the way it is documented to work, then IBM will do every thing it can to correct this - or to help you correct your code and your understanding so that they match what is documented.
That said, the best course of action to verify anything is to actually test the conditions you are worried about.
_________________
I am *not* the model of the modern major general. |
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| wschutz |
| Posted: Wed Apr 12, 2006 2:16 am Post subject: |
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Jedi Knight
Joined: 02 Jun 2005
Posts: 3316
Location: IBM (retired)
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You'll need to specify Version_2 for the MD's and the GMO structures. And of course, automatic segmentation is not supported on zOS.
The only thing to "watch out" for is the additional header (MQMDE) that is placed in the payload. Normally, you don't see this, since MQ merges it into the MQMD when getting the messages into a version 2 MQMD.
Also, to make it bullet proof, your qmgrname names that generate segmented messages all need to be unique within the first 12 characters of the name, since that's used to compose a unique GroupID for each set.
There was a post here recenty about a problem with conversion of segmented messages when MQFMT_NONE was being specified (to zOS), but you should be ok if you use MQFMT_STRING.
Segmentation has been around since V5.1 IIRC.
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-wayne |
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