PI07377: Primary shards hang during placement when ObjectGridEventListeners and sync replicas are configured.

APAR status

• Closed as program error.

Error description

• Primary shards hang during placement when data grid event
  listeners and synchronous replicas are configured.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  WebSphere eXtreme Scale users running with  *
  *                  synchronous replication,                    *
  *                  ObjectGridEventListeners, and template      *
  *                  maps.                                       *
  ****************************************************************
  * PROBLEM DESCRIPTION: When placing or promoting primary       *
  *                      shards, some or all of primary shards   *
  *                      do not open for traffic.                *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The primary shard appears in the xscmd routetable output, but
  clients experience TargetNotAvailableExcepions from the
  org.omg.CORBA.TRANSIENT package. The issue occurs when
  synchronous replication is configured and the data grid has an
  ObjectGridEventListener defined. The shardActivated
  method for the event listener must also create new template
  maps.
  The primary shard hangs during its startup. The JVM log
  of the primary shard can contain a COWBJ1574I message
  indicating long activation time. The CWOBJ1574I message
  includes a stack dump. For this issue, the stack includes the
  class and method:
  com/ibm/ws/objectgrid/replication/PrimaryShardImpl.mapCreated.
  A Java core dump of the container processes contain the same
  stack.
  

Problem conclusion

• To workaround, do not create template maps in an
  ObjectGridEventListener shardActivated method, or do not use
  synchronous replication. Apply the fix associated with this
  APAR.
  

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