PH63570: MEMORY LEAK IN WLM ROUTERMEDIATOR DURING MULTI-THREAD HEAVY LOAD TESTING

APAR status

• Closed as program error.

Error description

• Customer experiences a Memory Leak in WLM RouterMediator During
  Multi-Thread Heavy Load Testing.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of IBM WebSphere Application      *
  *                  Server                                      *
  ****************************************************************
  * PROBLEM DESCRIPTION: Memory Leak in WLM RouterMediator.      *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When multiple threads are trying to invoke a EJB call, it leads
  to
  a Memory Leak in RouterMediator class. The issue happens because
  the RouterMediator class keeps a track of outstanding calls as a
  map in a load manager, and one of the parameters used in the key
  for map is thread id. When number of threads increases, it
  gradually increases the size of map, which ultimately causes the
  memory leak.
  

Problem conclusion

• This is fixed by clearing the map, if there is no outstanding
  calls remaining. This feature is available only when we enable
  com.ibm.wlm.cleanOutstandingMap in system propertiess. By
  default the value for this argument is false.
  
  The fix for this APAR is targeted for inclusion in fix pack
  8.5.5.28 and 9.0.5.24. For more information, see
  'Recommended Updates for WebSphere Application Server':
  https://www.ibm.com/support/pages/node/715553
  

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

  WEBSPHERE APP S

• Fixed component ID

  5724J0800

Applicable component levels