IC82189: ENABLE MEDIATION FLOWS TO BE GCD WHEN HEAP IS UNDER STRESS

WebSphere Process Server V7.0.0 Fix Pack 5 (V7.0.0.5)
WebSphere Enterprise Service Bus V7.0.0 Fix Pack 5 (7.0.0.5)

APAR status

• Closed as program error.

Error description

• Mediation Flow objects are not garbage collectable and stay on
  the heap for the lifetime of the JVM. By making creating the
  flow objects with weak references, they will be eligible for
  Garbage Collection when the heap is under stress.
  

Local fix

• n/a
  

Problem summary

• Currently mediation flow objects stay on the heap for the
  lifetime of the JVM once they are created. If the server is long
  lived and there are many mediation modules or combination of
  mediation modules with different service interfaces then these
  objects can start filling up the heap.
  
  This APAR introduces a mechanism for releasing the flow objects
  in the SCA native container pools. The solution is to create the
  flow objects with weak references.
  
  With this approach the flow objects are now eligible for garbage
  collection when the heap is under stress.
  

Problem conclusion

• The code was modified such that weak references are now used in
  this case.
  
  
  There are no known side effects associated with this fix.
  There is no known alternative workaround should you encounter
  this problem.
  
  
  This code fix was targeted to be included in the following fix
  packs:
  
       7.0.0 Fix Pack 5 (v7.0.0.5)
       7.5.1 (v7.5.1.0)
  

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

  WEB ESB FOR WIN

• Fixed component ID

  5724I8200

Applicable component levels

• R700 PSY

     UP

• R750 PSY

     UP