PI68707: MQ V900 - ALLOCATION LOCKS ON SYSTEM.ADMIN.PERFM.EVENT QUEUE ARE NOT BEING RELEASED.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Allocation locks on SYSTEM.ADMIN.PERFM.EVENT being leaked, when
  the queue is not defined as a local queue (the csutomer has
  redefined to be an alias queue).
  In this situation CSQMIARC obtains an allocation lock on the
  queue, but never releases it.
  

Local fix

• n/a
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All users of IBM MQ for z/OS Version 9 Release 0             *
  * Modification 0.                                              *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * Event message generation leaks allocation locks when the     *
  * event queue is a non-local queue, leading to performance     *
  * degradation.                                                 *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * none                                                         *
  ****************************************************************
  When an event message is generated, a lock is obtained on the
  event queue name (for example SYSTEM.ADMIN.PERFM.EVENT,
  SYSTEM.ADMIN.QMGR.EVENT, depending on the type of event message
  being generated).
  If the event queue is a non-local queue (for example, it has
  been redefined as an alias queue, cluster queue or remote queue)
  this lock is not released when the event message has been put.
  The lock will remain held until the application generating the
  event message (e.g. batch application, channel initiator)
  disconnects from the queue manager.
  For long running applications, the number of these allocation
  duration locks being leaked can result in a build up of lock
  control blocks, resulting in performance degradation.
  

Problem conclusion

• CSQMIARC is changed to correctly release the allocation lock
  after putting an event message to a non-local event queue.
  

Temporary fix

Comments

APAR Information

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

  PI67954

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

  UI40909

Modules/Macros

• CSQMIARC
  

Fix information

• Fixed component name

  MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R000 PSY UI40909

     UP16/11/02 P F610

Fix is available

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