IT30479: High-CPU issue in amqzmuc0 and media recovery LSN not moving forwards

APAR status

• Closed as program error.

Error description

• After implementing "Automatic Media Imaging", IMGSCHED(AUTO)
  IMGINTVL(720) IMGLOGLN(OFF), amqzmuc0 appears to go into a
  loop after the IMGINTVL Time and the media recovery LSN does
  not move forward.
  

Local fix

• recreate the queue manager
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Users who delete permanent dynamic queues
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  The deletion of the permanent dynamic queue had resulted in
  incorrect records being written to the object catalog.
  
  As a result, a record of the deleted permanent dynamic queue
  name was present in the list of those queue names that ought to
  have media images recorded.
  
  Because there was not really a queue of that name any more, the
  code that was recording media images became confused, attempting
  and failing forever to record the same thing, with no delay.
  This, in turn, prevented the code moving onto the other queues
  in the list, and so the media LSN did not move forwards.
  

Problem conclusion

• Code has been added to correct this situation when re-reading
  the object catalog on queue manager startup.  Accordingly the
  code that records media images no longer has the problem that
  was noticed.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v9.1 CD    9.1.3
  v9.1 LTS   9.1.0.4
  
  The latest available maintenance can be obtained from
  'WebSphere MQ Recommended Fixes'
  http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037
  
  If the maintenance level is not yet available information on
  its planned availability can be found in 'WebSphere MQ
  Planned Maintenance Release Dates'
  http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309
  ---------------------------------------------------------------
  

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:

Fix information

• Fixed component name

  IBM MQ BASE MP

• Fixed component ID

  5724H7271

Applicable component levels