PK77354: DELAY IN MESSAGE DELIVERY DUE TO TERMINATION OF ALARM THREAD.

Java SDK 1.5 SR10 Cumulative Fix for WebSphere Application Server
6.1.0.31: Java SDK 1.5 SR11 FP1 Cumulative Fix for WebSphere Application Server
6.1.0.33: Java SDK 1.5 SR12 FP1 Cumulative Fix for WebSphere
6.1.0.29: Java SDK 1.5 SR11 Cumulative Fix for WebSphere Application Server
6.1.0.35: Java SDK 1.5 SR12 FP2 Cumulative Fix for WebSphere
6.1.0.37: Java SDK 1.5 SR12 FP3 Cumulative Fix for WebSphere
6.1.0.39: Java SDK 1.5 SR12 FP4 Cumulative Fix for WebSphere Application Server
6.1.0.41: Java SDK 1.5 SR12 FP5 Cumulative Fix for WebSphere Application Server
6.1.0.43: Java SDK 1.5 SR13 Cumulative Fix for WebSphere Application Server
6.1.0.45: Java SDK 1.5 SR14 Cumulative Fix for WebSphere Application Server
6.1.0.47: WebSphere Application Server V6.1 Fix Pack 47
6.1.0.47: Java SDK 1.5 SR16 Cumulative Fix for WebSphere Application Server

APAR status

• Closed as program error.

Error description

• Messages sent to a destination take a very long time to arrive
  when low volumes of messages are sent.  The delay is
  variable and messages that are delayed will only be delivered
  when further messages are sent.  Environments with this
  problem will see the following message in the SystemOut
  log any time before the observation of delayed messages:
  
  CWSIP0002E: An internal messaging error occurred in
  com.ibm.ws.sib.processor.utils.am.MPAlarmThread,
  <some exception>
  

Local fix

• fix required
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:  Users of the default messaging provider for *
  *                  WebSphere Application Server Version 6.1    *
  ****************************************************************
  * PROBLEM DESCRIPTION: An unexpected error occurs within       *
  *                      the messaging engine causing            *
  *                      an important thread to terminate.       *
  *                      The termination of this thread          *
  *                      prevents correct operation of the       *
  *                      messaging engine, and can delay the     *
  *                      delivery of messages.                   *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The thread that terminates after the unexpected error
  occurs is the message processor alarm manager. The exception
  is thrown from within a task being processed by the alarm
  manager thread. Because the exception is not caught, the
  thread is terminated.
  
  APAR PK76306 addresses one specific misconfiguration that can
  cause an exception of this type to be thrown.
  

Problem conclusion

• This APAR changes the handling of exceptions by the alarm
  manager thread. This minimizes the risk of a runtime exception
  causing this thread to terminate.
  
  This APAR does not address the cause of any runtime
  exceptions. The cause of each runtime exception caught by the
  alarm manager thread must be investigated individually.
  When this APAR is applied, runtime exceptions thrown to the
  alarm manager thread are reported via an FFDC from one of the
  following classes:
  com.ibm.ws.sib.processor.utils.am.BachedTimeoutManager
  com.ibm.ws.sib.processor.utils.am.MPAlarmManager
  CWSIP0002E error messages are also reported in the JVM logs of
  the application server that is hosting the messaging engine.
  
  The fix for this APAR is currently targeted for inclusion in
  fixpack 6.1.0.23.  Please refer to the Recommended Updates
  page for delivery information:
  http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
  

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

  PLAT MSG COM

• Fixed component ID

  620600101

Applicable component levels

• R200 PSY

     UP