PH31857: IBM WEBSPHERE APPLICATION SERVER WEB SERVER PLUGIN SETS THE INCORRECT DEFAULT FOR IGNOREAFFINITYREQUEST SETTINGS

APAR status

• Closed as program error.

Error description

• The default value for this property should be true, that is,
  ignore the past affinity connection and load balance based on
  current requests.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  IBM WebSphere Application Server web        *
  *                  server plugin users                         *
  ****************************************************************
  * PROBLEM DESCRIPTION: The IBM WebSphere Application server    *
  *                      web server plugin incorrectly           *
  *                      defaults ignoreAffinityRequests to      *
  *                      'false'                                 *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When using round robin distribution with affinity, the web
  server plugin should be set with ignoreAffinityRequest='true'
  but defaults to 'false' which is not the recommended setting.
  

Problem conclusion

• Default value corrected to indicate 'true'.
  
  With ignoreAffinityRequest set to 'true', the plugin module
  will equally distribute non-affinity requests amongst the
  servers based upon the server weight.
  
  When ignoreAffinityRequests is set to 'false', all the
  non-affinity may be sent to a single server and distribution
  may be very disproportional at given times.
  
  Examine your plugin-cfg.xml configuration file to ensure
  ignoreAffinityRequests is not set to false. The default value
  can be changed without applying maintenance by adding the
  custom property ignoreAffinityRequests as a web server plugin
  custom property and set the property to true. Regenerate and
  distribute the plugin configuration after altering this
  property.
  <a
  href="https://www.ibm.com/support/pages/recommended-values-web-s
  erver-plug-config">Recommended plugin values</a>
  
  The fix for this APAR is targeted for inclusion in fix pack
  8.5.5.19 and 9.0.5.7. For more information, see
  'Recommended Updates for WebSphere Application Server':
  https://www.ibm.com/support/pages/node/715553
  

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

  WEBSPHERE APP S

• Fixed component ID

  5724J0800

Applicable component levels

• R850 PSY

     UP

• R900 PSY

     UP