PI83240: FREQUENT QUEUE SERVICE INTERVAL HIGH EVENTS BEING GENERATED AFTER MAINTENANCE.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Queue service interval high events are getting generated more
  frequently after maintenance was applied.
  
  If multiple getters are checking for service interval high
  events at the same time, it is possible for the sequence of
  processing on two threads to result in a negative service
  interval being calculated. Because a negative interval is not
  expected, it is interpreted as a very large interval which
  exceeds the service interval threshold defined on the queue, so
  a service interval high event is issued.
  .
  Additional keywords:
  QSVCINT QSVCIEV HIGH
  SYSTEM.ADMIN.PERFM.EVENT
  MQRC_Q_SERVICE_INTERVAL_HIGH
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 0 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: Frequent queue service interval high    *
  *                      events may be produced when multiple    *
  *                      applications are serving messages on    *
  *                      the same queue.                         *
  ****************************************************************
  With performance events enabled, and an appropriate high service
  interval set on the queue. When multiple applications are
  servicing messages on the queue, if multiple gets occur within a
  short period of time, CSQMIAGM may wait for the object latch for
  the queue. However this may result in the calculation for
  elapsed time to return a negative value into an unsigned value.
  This results in the service interval high performance events
  being produced more frequently than expected.
  

Problem conclusion

• The processing has been altered to correctly calculate the time
  used prior to issuing the events to correctly deal with multiple
  getters waiting on the same object latch.
  

Temporary fix

Comments

APAR Information

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

  PI81927

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

  UI48529 PH03169

Modules/Macros

• CSQMIAGM
  

Fix information

• Fixed component name

  MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R000 PSY UI48529

     UP17/08/10 P F708

Fix is available

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