PI79932: WMQ TRIGGER MESSAGE FOR APPLICATION IS NOT GENERATED FOR TRIGTYPE(DEPTH)

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Change team finds that a trigger message has not been generated
  as expected. It occurs as the MQPUT of the second message was
  started when the queue had NOTRIGGER (before the ALTER command
  against the queue) A copy of the object is taken at the start of
  the MQPUT processing and is used to check for triggering once
  the message had been put to the queue. In this case the message
  is very large and the ALTER command was able to complete before
  the MQPUT had completed, resulting in this situation with a
  trigger message not being generated.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 0 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: Trigger messages can be missing in      *
  *                      initiation queues when putting messages *
  *                      to queues with trigger type MQTT_DEPTH. *
  ****************************************************************
  When a local queue has triggering configured with trigger type
  MQTT_DEPTH, trigger is off (NOTRIGGER) and an application puts a
  message reaching the trigger depth threshold that is processed
  concurrently with the command ALTER QLOCAL(nnn) TRIGGER (or
  MQSET) can result in the trigger message not being generated in
  the initiation queue.
  
  The trigger message is not generated because MQPUT does not
  detect that triggering has been enabled and the ALTER command
  (or MQSET) does not see the message that causes the queue DEPTH
  to reach the trigger depth threshold.
  

Problem conclusion

• The process for trigger type MQTT_DEPTH has been changed to
  synchronize the MQPUT process and the ALTER (or MQSET) command
  to avoid missing the generation of trigger messages.
  

Temporary fix

Comments

APAR Information

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

  PI79931

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

  UI48306

Modules/Macros

• CSQIDPUT CSQIERS3 CSQIMPU2 CSQIMPUT CSQIPUT1 CSQIPUT2 CSQIPUT5
  CSQMCNA1 CSQMPOM  CSQMSET  CSQMTRG0
  

Fix information

• Fixed component name

  MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R000 PSY UI49065

     UP17/08/11 P F708

Fix is available

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