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IZ76050: XMS .NET V2.0 CLIENT CONNECTED TO A WMQ V6 SERVER CAUSES MEMORY LEAK IN SESSION OBJECT.

Fixes are available

WebSphere MQ V7.0 Fix Pack 7.0.1.4
WebSphere MQ V7.0.1 for i5/OS Fix Pack 7.0.1.4

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APAR status

  • Closed as program error.

Error description

  • Using a XMS .NET v2.0 client application connected to a
WebSphere MQ v6 queue manager, the message producer's Close()
method is not properly disposing of referenced objects.  This
causes a build up in the Session object.  When multiple message
producers are continually opened and then closed, this memory
leak can lead to an OutOfMemoryException, causing an abnormally
termination of the XMS application.

Internally IMessageProducer.Dispose() does not dispose of all
references to object references resulting in the memory leak.

This does not occur when an XMS .NET .v2.0 application is
connected to a WebSphere MQ v7 queue manager.

Local fix

  • Upgrade the queue manager to WebSphere MQ v7.

Problem summary

  • ****************************************************************
USERS AFFECTED:
XMS .NET applications connecting to WebSphere MQ v6 server and
opening multiple producers and consumers.

Platforms affected:
Windows

****************************************************************
PROBLEM SUMMARY:
In XMS .NET client, when connecting to a WebSphere MQ v6 queue
manager, the list of objects created by the session is
maintained in two places - XmsSessionImpl and WmqSession.
When disposing the producer object, the reference in the
WmqSession list is not removed which results in memory build up
as the number of producers increase.

Problem conclusion

  • The code has now been changed such that the object list is
maintained only in XmsSessionImpl and when the objects are
disposed, the cleanup is done correctly.

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IZ76050
    • 

  • Reported component name
    MSG SRVCS CL .N
    • 

  • Reported component ID
    5724M2100
    • 

  • Reported release
    200
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt
    • 

  • Submitted date
    2010-05-14
    • 

  • Closed date
    2010-05-25
    • 

  • Last modified date
    2010-05-25
    • 





    

  • APAR is sysrouted FROM one or more of the following:
    

    • 

  • APAR is sysrouted TO one or more of the following:
    

    • 



Fix information


    

  • Fixed component name
    MSG SRVCS CL .N
    • 

  • Fixed component ID
    5724M2100
    • 



Applicable component levels


    

  • R200  PSY
       UP
    • 








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            25 May 2010
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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