PH65978: INCORRECT SYNCPOINT ISSUE FOR SYSTEM.RETAINED.PUB.QUEUE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• The problem occurs when retained publications are put under an
  implicit syncpoint, so when not specifying MQPMO_SYNCPOINT or
  MQPMO_NO_SYNCPOINT. The root cause of the problem is incorrect
  checking for a syncpoint put in CSQMTPUT. This can result in
  messages incorrectly building up on the
  SYSTEM.RETAINED.PUB.QUEUE. If messages are backed out then this
  can also result in retained publications incorrectly being
  deleted from the SYSTEM.RETAINED.PUB.QUEUE.
  

Local fix

• To address the incorrect syncpoint issue for retained
  publications, users can specify either MQPMO_SYNCPOINT or
  MQPMO_NO_SYNCPOINT explicitly when putting messages. This
  ensures that the syncpoint handling is correctly managed,
  preventing unintended message buildup or deletion on the
  SYSTEM.RETAINED.PUB.QUEUE.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 3 Modification 0 and Release 4       *
  *                 Modification 0                               *
  ****************************************************************
  * PROBLEM DESCRIPTION: The issue arises when retained          *
  *                      publications do not explicitly set a    *
  *                      syncpoint value (without specifying     *
  *                      MQPMO_SYNCPOINT or MQPMO_NO_SYNCPOINT). *
  *                      This incorrect checking for a syncpoint *
  *                      leads to messages incorrectly building  *
  *                      up on the SYSTEM.RETAINED.PUB.QUEUE.    *
  *                      Additionally, if messages are backed    *
  *                      out, retained publications may be       *
  *                      incorrectly deleted from the queue.     *
  ****************************************************************
  The root cause of the problem is the incorrect handling of
  implicit syncpoints when publishing using the retained
  publication option. This results in unintended message buildup
  and deletion behaviours on the SYSTEM.RETAINED.PUB.QUEUE.
  

Problem conclusion

• The issue of incorrect syncpoint handling for retained
  publications has been identified. By ensuring the correct
  resolution, we can prevent unintended behaviour on the
  SYSTEM.RETAINED.PUB.QUEUE
  

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:

  UO03897 UO03898

Modules/Macros

• CSQMTPUT
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R300 PSY UO03898

     UP25/07/12 P F507

• R400 PSY UO03897

     UP25/07/12 P F507

Fix is available

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