PI97935: KeyNotFoundException in CWOBJ1524I message when replica shard is registering with the primary

APAR status

• Closed as program error.

Error description

• CWOBJ1524I: Replica listener GRID:MAPSET:0 must register again
  with the primary. Reason:
  com.ibm.websphere.objectgrid.KeyNotFoundException: ObjectGrid:
  GRID, Map: MAP, Key: KeyDataBytesImpl: {key1}
  
  
  A KeyNotFoundException exception can happen on a synchronous
  replica when applying an update operation on a map that has
  Optimistic LockStrategy and time to live eviction configured
  

Local fix

• Use pessimistic locking or remove the TTL evictor
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:  Users of eXtreme Scale who use synchronous  *
  *                  replication with an Optimistic LockStrategy *
  *                  and time to live eviction configured.       *
  ****************************************************************
  * PROBLEM DESCRIPTION: When applying an update operation on    *
  *                      a synchronous replica a                 *
  *                      KeyNotFoundException exception can      *
  *                      occur.                                  *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When applying an update operation on a synchronous replica,
  the logic did an implicit get operation to determine the
  optimistic version of the previous value.  This logic is not
  necessary on a synchronous replica and was disabled to avoid
  the KeyNotFoundException.  With the introduction of JCache in
  8.6.1, this became necessary since a get operation now returns
  null if an entry is expired.
  

Problem conclusion

• An interim fix is available for this APAR upon request for
  eXtreme Scale version 8.6.1.2.
  

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