IT44268: Following an HA reconnection, the queue manager no longer runs on the preferred node

APAR status

• Closed as program error.

Error description

• After a high availability (HA) queue manager reconnection event
  on the IBM MQ Appliance, the queue manager is intermittently
  observed running on a partner node instead of the specified
  preferred node.
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  MQ Appliance users on version IBM MQ 9.3 who are using a high
  availability queue manager.
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  When an HA reconnection event takes place, it is expected that
  the queue manager will run on the preferred node.
  However, it was found that, intermittently, the queue manager
  was running on the partner nodes instead.
  
  This was due to a defect in the code which failed to refresh the
  transient attributes for the preferred node during reconnection
  of the primary, secondary, and replication interfaces.
  
  This resulted in the queue manager running on a partner node
  instead of the primary, which is the queue manager's preferred
  location, after the reconnection of the network.
  

Problem conclusion

• The code change associated with this APAR updates the MQ
  Appliance behaviour to check if transient attributes have been
  previously set before setting it itself, so these do not get
  lost after a synchronisation operation.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v9.3 LTS   9.3.0.10
  v9.x CD    9.3.3
  
  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

  MQ APPLIANCE M2

• Fixed component ID

  5900ALJ00

Applicable component levels