PM79820: MQ QUEUE DEPTH LOW (Q_DEPTH_LOW) EVENT IS NOT GENERATED WHEN ALL OF THE MESSAGES ARE EXPIRED

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• An MQ queue depth hi event occurs due to message buildup after
  the CICS application is shutdown that consumes messages from the
  queue. The messages that are on the queue are non-persistent
  with expiry times. When the CICS application is restarted, an
  MQGet is issued for the queue and no messages are returned due
  to all of the messages expiring. The MQGet has caused the queue
  depth to now be zero which is below the
  queue depth limit but an Q_Depth_Low event is not generated.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 7 *
  *                 Release 0 Modification 1 and Release 1       *
  *                 Modification 0.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: Q_DEPTH_LOW event is not generated when *
  *                      the low threshold is reached due to     *
  *                      message expiry. QDPHIEV is not          *
  *                      reenabled, and subsequent Q_DEPTH_HIGH  *
  *                      events are not generated.               *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  After the queue depth high (QDEPTHHI) thereshold is reached and
  a Q_DEPTH_HI event is generated, queue depth high events for the
  queue are disabled and queue depth low events are enabled.
  If the queue depth drops below the queue depth low (QDEPTHLO)
  threshold due to messages expiring, no Q_DEPTH_LO event is
  generated, and queue depth high events remain disabled.
  If the queue depth subsequently reaches the high threshold
  again, no Q_DEPTH_HI event is generated.
  

Problem conclusion

• CSQMGET is changed to call CSQMIAGM to determine whether to
  generate a queue depth low event, even if the get found no
  suitable message, if messages have expired since the last queue
  depth low event was generated.
  010Y
  100Y
  CSQIMGES
  CSQIMGEW
  CSQIMGEX
  CSQMGET
  CSQMIAGM
  

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:

  UK93700 UK93701

Modules/Macros

• CSQIMGES CSQIMGEW CSQIMGEX CSQMGET  CSQMIAGM
  

Fix information

• Fixed component name

  WMQ Z/OS V7

• Fixed component ID

  5655R3600

Applicable component levels

• R010 PSY UK93700

     UP13/06/14 P F306

• R100 PSY UK93701

     UP13/06/14 P F306

Fix is available

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