PM39993: EXCESS MEMORY UTILIZATION ON THREADLOCAL IN XMLTYPEUTIL CAN CAUSE SERVANT REGION TO ABEND.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• The Eclipse class
  "org.eclipse.emf.ecore.xml.type.util.XMLTypeUtil"
  will see excess memory utilization in a thread local variable
  when XML data containing large character data sections is parsed
  This can lead to threads timing out due to heavy GC to clean up
  the heap consumed by these large ThreadLocal objects, and
  eventually cause Servants to abend with an EC3.
  

Local fix

• na
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of IBM WebSphere Application      *
  *                  Server                                      *
  ****************************************************************
  * PROBLEM DESCRIPTION: Excess memory utilization will occur    *
  *                      on thread local  variable               *
  *                      org.eclipse.emf.ecore.xml.type.util.XML *
  *                      TypeUtil$CharArrayThreadLocal when      *
  *                      XML data containing large character     *
  *                      data sections (CDATA sections) is       *
  *                      parsed.  This can lead to threads       *
  *                      timing out due to heavy garbage         *
  *                      collection (GC) and eventually cause    *
  *                      Servants to abend with an EC3.          *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The problem occurs because the thread local variable
  org.eclipse.emf.ecore.xml.type.util.XMLTypeUtil$CharArrayThreadL
  ocal performs an allocation which is proportional to the size
  of the character data sections (CDATA sections) which are
  processed.  Because of how threads are managed, that leads to
  an effective permanent static allocation.
  

Problem conclusion

• The problem was resolved by rewriting XMLTypeUtil to remove
  unnecessary allocations, including the removal of the thread
  local variable which caused the excess memory allocation.
  
  APAR PM39993 is currently targeted for inclusion in
  Service Level (Fix Pack) 7.0.0.19 of WebSphere
  Application Server.
  
  Please refer to URL:
  //www.ibm.com/support/docview.wss?rs=404&uid=swg27006970
  for Fix Pack availability.
  

Temporary fix

Comments

APAR Information

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

  PM34450

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

  106PC1Ÿ

Fix information

• Fixed component name

  WEBSPHERE FOR Z

• Fixed component ID

  5655I3500

Applicable component levels

• R700 PSY UK71297

     UP11/09/10 P F109

Fix is available

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