PM09797: A WEBSPHERE MQ LINK RECEIVER MAY STOP WHILE THE QUEUE MANAGER IS STILL SENDING DATA, CAUSING MESSAGE AMQ9206 (ERROR SENDING DATA)

6.1.0.33: Java SDK 1.5 SR12 FP1 Cumulative Fix for WebSphere
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
6.1.0.47: WebSphere Application Server V6.1 Fix Pack 47
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: Java SDK 1.5 SR16 Cumulative Fix for WebSphere Application Server

APAR status

• Closed as program error.

Error description

• When a WebSphere MQ Link receiver is active, it receives
  batches of messages from a queue manager and sends them to
  destinations in the Service Integration Bus.  After each batch,
  the WebSphere MQ link receiver must commit the messages and
  acknowledge them to the queue manager.  In rare cases, the
  WebSphere MQ Link receiver may shut down after successfully
  acknowledging a batch of messages.
    In the WebSphere Application Server SystemOut.log file there
  is no indication of an error, just message CWSIC3232I
  ("WebSphere MQ link ￭X ended normally.")  The error logs on the
  queue manager will show more serious messages like AMQ9206
  ("Error sending data to host ￭X", possibly including a TCP/IP
  error code like EPIPE) and AMQ9999 ("Channel program ended
  abnormally").
    This problem does not affect WebSphere MQ Links in
  WebSphere Application Server V7.0.
  

Local fix

• If the WebSphere MQ sender channel is configured to retry, it
  should restart successfully and continue sending messages.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:  Users of the default messaging provider     *
  *                  for IBM WebSphere Application Server v6.1   *
  ****************************************************************
  * PROBLEM DESCRIPTION: WebSphere MQ Link Receiver shuts down   *
  *                      after successfully sending a            *
  *                      batch of messages.                      *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The MQ Link way shut down after it has successfully
  acknowledged a batch of messages. This was due to a timing
  issue where the state of the receiver was examined at the same
  time that new work arrived. No error message is seen in the
  log and the MQ Link is seen to shutdown normally.
  

Problem conclusion

• This APAR solves to problem, and makes sure the MQ Link is not
  shutdown unless told too.
  
  The fix for this APAR is currently targeted for inclusion in
  fix pack 6.1.0.33.  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

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