PM79767: Intermittent timing issues can occur when containers start and cause placement to occur prematurely.

APAR status

• Closed as program error.

Error description

• In large environments when you run the xscmd resumeBalancing
  command, or when a large number of containers have been
  started and balancing begins, there can be a bottleneck of work
  in the object request broker (ORB) thread pool.
  
  Most of the ORB threads from the Java core file process the
  checkEpochForObjectGridRouteInfo message:
  
  .
  .
  .
  
  at
  com.ibm.ws.objectgrid.objectMapping.ObjectBytes.bytesToObject(Ob
  jectBytes.java:169)
  at
  com.ibm.ws.objectgrid.catalog.placement.ReadOnlyCatalogServiceIm
  pl.copyObjectGridEndpoint(ReadOnlyCatalogServiceImpl.java:274)
  at
  com.ibm.ws.objectgrid.catalog.placement.ReadOnlyCatalogServiceIm
  pl.checkEpochForObjectGridRouteInfo(ReadOnlyCatalogServiceImpl.j
  ava:131)
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  Any eXtreme Scale user who runs the         *
  *                  suspend and resume placement function.      *
  ****************************************************************
  * PROBLEM DESCRIPTION: If a data grid is suspended before      *
  *                      the hosting containers start, then      *
  *                      placement can occur prematurely.        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Intermittent timing issues during container startup overrides
  the suspend placement setting, and can cause placement to
  occur prematurely.
  

Problem conclusion

• A fix has been included to honor the suspension of placement
  during the initial start of a data grid.
  

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

• R850 PSY

     UP

• R860 PSY

     UP