PI92265: SETTING ONE JVM OF MULTIPLE DYNAMIC CLUSTERS INTO MAINTENANCE MODE, FAILS FOR ALL DYNAMIC CLUSTERS EXCEPT FOR ONE.

8.5.5.17: WebSphere Application Server V8.5.5 Fix Pack 17
8.5.5.20: WebSphere Application Server V8.5.5.20
8.5.5.18: WebSphere Application Server V8.5.5 Fix Pack 18
8.5.5.19: WebSphere Application Server V8.5.5 Fix Pack 19
8.5.5.16: WebSphere Application Server V8.5.5 Fix Pack 16
8.5.5.21: WebSphere Application Server V8.5.5.21

APAR status

• Closed as program error.

Error description

• When using multiple dynamic clusters, with each being
  configured with the criteria "minimum / maximum instances
  set
  to 1/1", the APC does successfully put the cluster member of
  one dynamic cluster into Maintenance Mode and starts an
  additional member to meet the criteria. For each additional
  dynamic cluster, the operation fails with the following
  sequence of events.
  a) CWMMS0468E -> The server maintenance mode operation timed
  out
  b) CWMMS0461E -> A server maintenance mode error occurred
  and
  the operation will be rolled back.
  c) CWMMS0448I -> Notifying the application placement
  controller
  (APC) of the server maintenance mode change to false ...
  d) CWMMS0465I -> The roll back of the server maintenance
  mode
  operation has completed successfully.
  

Local fix

• n/a
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of IBM WebSphere Application      *
  *                  Server WAS ND edition- Virtual              *
  *                  Enterprise/IM Component                     *
  ****************************************************************
  * PROBLEM DESCRIPTION: Putting multiple server instances, from *
  *                      multiple Dynamic clusters into          *
  *                      maintenance mode fails for all servers  *
  *                      except one                              *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Putting multiple server instances in maintanance mode across
  multiple dynamic clusters failed with message CWMMS0461E for all
  instances except one.  This was caused due to two factors; one
  being an intermittent issue of a race condition between threads
  which could prevent APC from acting upon the request and the
  second factor, a configuration issue, was a high value for APC
  property Minimum time between placement change which caused the
  pending maintanance mode request to time out.
  

Problem conclusion

• Code was modified to resolve the race condition among threads
  for APC notification. It is also advisable to ensure the time
  out for maintenance mode exceeds the APC property, Minimum time
  between placement change.
  
  The fix for this APAR is currently targeted for inclusion in fix
  pack 8.5.5.16.  Please refer to the Recommended Updates page for
  delivery information:
  http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
  

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

  WEBS APP SERV N

• Fixed component ID

  5724H8800

Applicable component levels

• R850 PSY

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