IC92932: MQ 7.1 OR 7.5 MANAGED.NET CLIENT DISTRIBUTED TRANSACTIONAL APPLICATIONS SHOW MEMORY LEAK

Fix Pack 7.1.0.4 for WebSphere MQ V7.1

APAR status

• Closed as program error.

Error description

• When making WebSphere MQ Managed .NET Client calls as part of
  a Microsoft DTC transaction, applications will find the
  process's private bytes continuously increasing for the complete
  duration of the application execution.
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  All the MQ Managed .NET Client for Distributed Transactional
  applications.
  
  Platforms affected:
  Windows
  
  ****************************************************************
  PROBLEM SUMMARY:
  WebSphere MQ Managed .NET Client, when enlisting into ambient
  transaction was providing a new RMID every time. When there are
  huge number of transactions, we have identified that MSDTC was
  leaking memory. When MQ Managed .NET client enlisting into a new
  transaction happens in a loop(that is making a MQ PUT/GET call
  under new transaction scope), the memory leak is evident and can
  be observed from Task Manager's process private bytes.
  

Problem conclusion

• The MQ Managed .NET client code has been modified to use single
  RMID for any number of transaction enlistments.
  
  
  At version 7.5, this issue is resolved by applying IC92296
  
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v7.1       7.1.0.4
  
  
  The latest available maintenance can be obtained from
  'WebSphere MQ Recommended Fixes'
  http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037
  
  If the maintenance level is not yet available information on
  its planned availability can be found in 'WebSphere MQ
  Planned Maintenance Release Dates'
  http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309
  ---------------------------------------------------------------
  

Temporary fix

Comments

APAR Information

• 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

  WMQ WINDOWS V7

• Fixed component ID

  5724H7220

Applicable component levels

• R710 PSY

     UP