PI84314: WMQ SHARED CHANNEL RETRY PROCESSING IS NOT ATTEMPTED

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• A shared channel has no CURRENT channel status. After a DB2
  change the channel stops with CSQX037E and CSQX599E ; after DB2
  is restarted MQ reconnects to it however the channel (displaying
  a state of RUN in this case) is unable to move any messages from
  the XMITQ, has no CURRENT status, and displays return a GET
  disabled state for the XMITQ.
  -
  Change Team finds that while the CHIN has SMF statistics
  enabled and a shared channel is in RETRY (at the time that
  the statistics interval passes) this issue may occur as
  CSQXSMFT invokes CSQXCCHC for shared/local channel status
  reconcile processing. Since an hCONN is not passed this
  results in the deletion of the local status entry for the
  RETRYING channel, meaning no further attempts to start the
  channel take place.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 0 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: Shared sender channels stop retrying    *
  *                      unexpectedly.                           *
  ****************************************************************
  A shared sender channel is in retry state as the partner
  queue-manager is out of action for an extended period of time.
  However, the channel unexpectedly stops retrying after a
  statistics collection interval.
  The problem occurs when the CHIN has SMF statistics enabled and
  a shared channel is in retry at the time a statistics interval
  is reached. The Chinit SMF Task CSQXSMFT calls CSQXCCHX for
  shared/local channel status reconcile processing. However a null
  connection handle is passed on the call resulting in an
  unsuccessful attempt to locate the shared channel status entry.
  As the shared channel status entry can not be found the
  associated local channel status entry is deleted leaving the
  channel in inactive rather the retrying state.
  

Problem conclusion

• The Chinit SMF Task CSQXSMFT has been updated to pass a valid
  connection handle on the call to CSQXCCHX for shared/local
  channel status reconcile processing.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  PI79845

• APAR is sysrouted TO one or more of the following:

  UI48962

Modules/Macros

• CSQBPTUB CSQXSMFT IMQS23DM IMQS23DR
  

Fix information

• Fixed component name

  MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R000 PSY UI48962

     UP17/08/10 P F708

Fix is available

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