PI67954: MQ V800 - ALLOCATION LOCKS ON SYSTEM.ADMIN.PERFM.EVENT QUEUE ARENOT 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 WebSphere MQ for z/OS Version 8 *
  *                 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:                                              *
  ****************************************************************
  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.
  000Y
  CSQMIARC
  

Temporary fix

• *********
  * HIPER *
  *********
  

Comments

APAR Information

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

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

  PI68707 UI40885

Modules/Macros

• CSQMIARC
  

Fix information

• Fixed component name

  WMQ Z/OS 8

• Fixed component ID

  5655W9700

Applicable component levels

• R000 PSY UI40885

     UP16/10/06 P F610 ¢

Fix is available

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