PI84785: MQ - HIGH CPU CONSUMPTION IN THE MSTR USING THE JMS 2.0 DELIVERY DELAY FUNCTION.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• A high CPU usage in the MSTR using the JMS 2.0 DELIVERY DELAY
  function when the queue depth for the SYSTEM.DDELAY.LOCAL.QUEUE
  is large.
  

Local fix

• n/a
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 0 Modification 0                     *
  ****************************************************************
  * PROBLEM DESCRIPTION: Using JMS 2.0 delivery delay feature    *
  *                      with a large number of delayed messages *
  *                      on the SYSTEM.DDELAY.LOCAL.QUEUE, high  *
  *                      CPU usage may be seen for the Queue     *
  *                      Manager.                                *
  ****************************************************************
  Messages delayed using JMS 2.0 delivery delay are put on to the
  SYSTEM.DDELAY.LOCAL.QUEUE. The delivery delay processor browses
  this queue with message marking to deliver the message when the
  delay time has expired. However the browse cursor is incorrectly
  reset, which results in the delay processing starting the browse
  from the beginning of the queue. With a large number of delayed
  messages this can result in a large increase of CPU usage.
  

Problem conclusion

• The cursor logic when browsing a queue with message marking, has
  been corrected to not incorrectly reset the cursor in this case.
  

Temporary fix

Comments

APAR Information

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

  PI82732

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

  UI52058

Modules/Macros

• CSQMMTPR
  

Fix information

• Fixed component name

  MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R000 PSY UI52058

     UP17/12/16 P F712 ¢

Fix is available

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