PH37666: MDB LISTENER PORT HAS INCONSISTENT STATUS ACROSS MULTIPLE SERVANTS

APAR status

• Closed as program error.

Error description

• A servant region ABEND occurred while executing
  PAUSELISTENERS.  When a new servant region started, the Message
  Listener Port was restarted and the MDB in the new servant
  region processed messages.  The other servant regions did
  not process messages and a subsequent RESUMELISTENERS did not
  restart message processing in these servant regions.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  WebSphere Application Server users of       *
  *                  Message Listener Ports                      *
  ****************************************************************
  * PROBLEM DESCRIPTION: Message Listener Port state             *
  *                      inconsistent across multiple servant    *
  *                      regions if a servant region dies        *
  *                      during PAUSELISTENERS                   *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  A servant region ABEND occurred while executing
  PAUSELISTENERS.  When a new servant region started, the Message
  Listener Port was restarted and the MDB in the new servant
  region processed messages.  The other servant regions did
  not process messages and a subsequent RESUMELISTENERS did not
  restart message processing in these servant regions.
  There are multiple issues with this behaviour:
  1) The restarted servant should not have started processing
  messages since the listeners were paused.
  2) The subsequent RESUMELISTENERS did not resume message
  processing across all servant regions.
  3) Message processing was inconsistent across servant regions
  with the restarted servant region processing messages and the
  other servant regions not doing so.
  

Problem conclusion

• The Messaging component was modified so that the failure of
  the servant region during PAUSELISTENERS is detected and the
  state of the Message Listener Port successfully changed to
  paused.  This also prevents the the restarted servant region
  from processing messages while the listeners are paused.
  Should a mixed servant listener status occur for any other
  reason then the changes also allow a subsequent
  RESUMELISTENERS to restore message processing across all
  servant regions and also prevent premature message processing
  by the restarted servant region while the listeners are paused.
  
  The fix for this APAR is targeted for inclusion in fix pack
  9.0.5.10.  For more information, see 'Recommended Updates for
  WebSphere Application Server':
  https://www.ibm.com/support/pages/node/715553
  

Temporary fix

• If this condition should occur, an additional PAUSELISTENERS
  can be performed that will complete pausing of the message
  listener port and prevent message processing across all of the
  servant regions.
  

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

  WEBSPHERE FOR Z

• Fixed component ID

  5655I3500

Applicable component levels