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| MQ Client upgrade - do apps need to be relinked? |
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| dogbert64 |
 Posted: Tue Jun 26, 2007 5:42 am Post subject: MQ Client upgrade - do apps need to be relinked? |
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Acolyte
Joined: 11 Jun 2003
Posts: 58
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I am in the process of upgrading the MQ Clients that our application servers have from 5.3 to 6.0.
My question is, do the applications need to be relinked to the 6.0 libraries when I do this or will they work with the 5.3 libraries linked to them as is?
I would like to be able to upgrade the MQ Clients on my timeline, and then have the developers link in the new 6.0 libraries the next time they elevate their code.
If you look at this: http://www-1.ibm.com/support/docview.wss?uid=swg24009961&rs=0&cs=utf-8&context=SSFKSJ&dc=D400&loc=en_US&lang=en&cc=US
it says this: The link between the application and the client code is established dynamically at runtime. which leads me to believe that an application with the 5.3 libraries linked to it will work with the 6.0 client.
As a test, I went to a server with the MQ 6.0 client installed, and found and renamed all instances of amqsputc.exe as well as amqsgetc.exe. I then copied amqsgetc.exe and amqsputc.exe from a server with the MQ 5.3 client to C:\Temp\. I verified that these executables could not be found in the System Path, and ran them out of C:\Temp\ successfully with successful MQGETs and MQPUTs.
This seems to indicate that it will work the way I would like it to, but I wanted to cast this to a wider crowd to see if anyone knows of a problem with my approach.
Also, I searched MQSeries.NET for a prior question on this subject but could not find any. |
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| jefflowrey |
| Posted: Tue Jun 26, 2007 6:19 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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Most v6 installations are 64 bit by default... this means that the default libraries and etc that are available are 64bit by default.
A 32bit app is going to have trouble running 64bit libraries.
There are comments in the "Implications of a 64bit queue manager" in the Quick Beginnings Guide for various platforms about using the 32bit libraries for 32bit applications.
What you want should work, but you'll have to pay attention and be prepared for a surprise or two.
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I am *not* the model of the modern major general. |
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| ourtown |
| Posted: Tue Jun 26, 2007 6:24 am Post subject: |
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Acolyte
Joined: 05 Feb 2002
Posts: 67
Location: Somerset, NJ
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This isnt really an MQ question
When your applications are built with a specific library version it is always sensible to recompile them when the libraries change
You may be lucky or you may get errors that are very difficult to resolve when the history isnt known
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Brian S. Crabtree
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| dogbert64 |
| Posted: Tue Jun 26, 2007 1:09 pm Post subject: |
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Acolyte
Joined: 11 Jun 2003
Posts: 58
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FWIW, I opened an ETR with IBM today and received a prompt reply for this question. Here is their response:
Action Taken:
If you are not moving your application to a new platform then relinking
/compiling will not be necessary.
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Action Plan:
Requeue PMR to customer for review and closure
I still have to read up on the Quick Beginnings section that JeffLowrey mentioned.
So based on IBM's response, I'll continue on as I was originally planning to do, and sleep with one eye open. |
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| Nigelg |
| Posted: Tue Jun 26, 2007 11:24 pm Post subject: |
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Grand Master
Joined: 02 Aug 2004
Posts: 1046
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All the 32-bit libs are still available for apps to use, in /var/mqm/lib. The 64-bit libs are in /var/mqm/lib64, and are used by the qmgr and channel processes.
You can continue to use the apps without change, since the libs are still there. If you have any server-side channel exits, you will have to rebuild them 64-bit to load into the 64-bit channel processes running the MCA.
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MQSeries.net helps those who help themselves.. |
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