IT36495: Queue manager might enter partitioned state after appliance reloads

APAR status

• Closed as program error.

Error description

• The drouter process unexpectedly terminates leading to appliance
  reload and this causes the queue managers running on their
  primary
  node (APP1) to end and then they are all started on their
  secondary node (APP2).
  
  However, if any of the queue managers take long time to end,
  exceeding the wait time provided by the  cluster manager
  processes before
   it is restarted on the secondary node , then it ends up running
  on both the nodes and  this leads to split-brain situation and
  hence a Partitioned state.
  
  
  2021-04-07 11:59:22.546508-04:00 APP1 supervisor: Restart event
  for process drouter (PID 123317) - Reason: (2) Signal info: PID
  (123317) Signal (17) Status (9)(EXIT(-1) SIG(9) CORE(0))
  

Local fix

• Resolve partitioned state by running 'makehaprimary QMgrName'
  in the winner appliance.
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Users using MQ Appliance for HA
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  MQAppliance reload results in the restart of the cluster manager
  processes which in turn triggers the failover of the HA queue
  managers from the primary to the secondary node.  If the queue
  manager did not terminate on the Primary node before the cluster
  manager process were restarted then this caused the queue
  manager to enter a Partitioned state.
  

Problem conclusion

• The code is modified to ensure the queue manager process is
  terminated before the cluster manager process are restarted on
  the primary node in the event of reload.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v9.2 LTS   9.2.0.4
  v9.x CD    9.2.4
  
  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

  MQ APPL M2002 V

• Fixed component ID

  5737H4701

Applicable component levels