IT25741: MQ cluster full repository unable to complete "REFRESH CLUSTER" command, reporting AMQ9511 error

APAR status

• Closed as program error.

Error description

• REFRESH CLUSTER fails on Full Repository queue manager on rare
  occasions.
  
  Additional symptoms include:
  --
  AMQ9511: Messages cannot be put to a queue.
  
  EXPLANATION:
  The attempt to put messages to queue
  'SYSTEM.CLUSTER.TRANSMIT.QUEUE' on queue
  manager 'xxxxxxx' failed with reason code 2041.
  
  The issue may also manifest as cluster resolution errors as a
  result of the failed refresh: "MQOPEN on object 'Q' returned
  2189
  Cluster resolution error."
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Users running REFRESH CLUSTER on a Full Repository queue manager
  in a cluster.
  
  
  Platforms affected:
  Windows, Linux on zSeries, Linux on x86-64, Linux on x86, Linux
  on S390, Linux on Power, AIX, IBM iSeries
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  During REFRESH CLUSTER on a full repository, the MQ repository
  manager logic incorrectly attempted to send updates via cluster
  channels that were not marked as "in use".  Cluster channels not
  marked as "in use" can occur if, for example, the user
  introduces a queue manager with a channel name already in use in
  the cluster. This would replace the existing queue manager as
  the "in use" record. This configuration might have happened
  deliberately or by a user mistake and channels in this state
  will exist for a few weeks in the cluster even after the user
  deletes the QM that contains them.
  
  The repository manager process should not have tried to send an
  update to a non-"in use" channel. The errors resulting from this
  situation internally to the queue manager were not being handled
  correctly.
  

Problem conclusion

• The WebSphere MQ product code will be corrected so that sending
  of updates will not be attempted via non-"in use" channels.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v8.0       8.0.0.11
  v9.0 LTS   9.0.0.6
  v9.1 CD    9.1.1
  v9.1 LTS   9.1.0.1
  
  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:

  PH02131

Fix information

• Fixed component name

  IBM MQ BASE MP

• Fixed component ID

  5724H7251

Applicable component levels