PI38996: ObjectGridRuntimeException occuring when concurrent threads in the same JVM connect and disconnect to the same grid

APAR status

• Closed as program error.

Error description

• The following exception is when WebSphere eXtreme Scale Client
  tries accessing the data grid randomly. In this scenario,
  a connection was attempted to the data grid; however, that
  connection was closed each time.
  
  WebSphere eXtreme Scale [WXS 8.6.0.6 cf61449.04150359]
  Platform 7.0.0.35 [ND 7.0.0.35 cf351436.02][ARIESJPA 1.0.0.9
  cf091248.03]
  
  Operating System: Linux, version 2.6.32-431.29.2.el6.x86_64
  
  Java version = JRE 1.6.0 IBM J9 2.4 Linux amd64-64
  jvmxa6460sr16-20140626_204542 (JIT enabled, AOT enabled)
  J9VM - 20140626_204542
  JIT  - r9_20130920_46510ifx7
  GC   - GA24_Java6_SR16_20140626_1848_B204542_CMPRSS, Java
  Compiler =
  j9jit24, Java VM name = IBM J9 VM
  ----
  
  
  ----
  [2/24/15 14:41:41:785 GMT] 00000035 WebServiceExc E
  org.apache.axis2.jaxws.WebServiceExceptionLogger log A
  com.ibm.websphere.objectgrid.ObjectGridRuntimeException
  throwable was
  caught.  The detail
  
  message is:  at
  com.ibm.ws.objectgrid.naming.LocationServiceFactory.getRemoteLoc
  ationSer
  vice(LocationServiceFactory.java:824)
  ....
  ....
  
  com.ibm.websphere.objectgrid.ObjectGridRuntimeException: The
  Location
  Service for domain DefaultDomain has not yet been resolved.
  809  at
  com.ibm.ws.objectgrid.naming.LocationServiceFactory.getRemoteLoc
  ationSer
  vice(LocationServiceFactory.java:824)
  810  at
  com.ibm.ws.objectgrid.ObjectGridManagerImpl.getObjectGrid(Object
  GridMana
  gerImpl.java)
  811  at
  com.ibm.ws.objectgrid.ObjectGridManagerImpl.getObjectGrid(Object
  GridMana
  gerImpl.java:858)
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  WebSphere eXtreme Scale users with a        *
  *                  remote topology.                            *
  ****************************************************************
  * PROBLEM DESCRIPTION: ObjectGridRuntimeException occur        *
  *                      when concurrent threads connect and     *
  *                      disconnect to the same data grid.       *
  ****************************************************************
  * RECOMMENDATION:  For performance reasons, a single client    *
  *                  connection should be used per data grid     *
  *                  and shared between any threads.             *
  ****************************************************************
  A timing window exists where a ObjectGridRuntimeException
  might occur when concurrent threads in the same client JVM
  invoke ObjectGridManager.connect() and
  ObjectGridManager.disconnect() methods against the same remote
  data grid.
  

Problem conclusion

• A code fix was made to eliminate the timing window.
  

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

  WS EXTREME SCAL

• Fixed component ID

  5724X6702

Applicable component levels

• R860 PSY

     UP