PM82446: SESSION REBALANCING FAILS

8.5.0.2: WebSphere Application Server V8.5 Fix Pack 2

APAR status

• Closed as program error.

Error description

• WVE HTTP session rebalancing is terminated abnormally which
  causes the sessions to not actually be moved.  This causes the
  DWLM controller to send additional session move requests and can
  cause delays in request/response processing.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of WebSphere Virtual Enterprise   *
  *                                                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: The HTTP session rebalancing            *
  *                      fails, and causes on demand router      *
  *                      request or response processing delay.   *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The on demand routers communicate to ensure that a request is
  routed with affinity to the same server based, on the dynamic
  workload management controller session move messages. During
  each move request communication, the primary on demand router
  waits for a maximum of 2 seconds to get session statistics from
  each of the secondary on demand routers. The on demand router
  waits full 2 seconds if the communication is affected by
  stress in the system. This behavior causes delays in the on
  demand router request processing.
  

Problem conclusion

• The session move coordination algorithm was fixed to remove the
  2 second delay.
  
  This fix will be included in the next available fix pack for
  WebSphere Virtual Enterprise.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  PM73753

• 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

     UP