IBM Support

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

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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 number

    PH31857

  • Reported component name

    WEBSPHERE APP S

  • Reported component ID

    5724J0800

  • Reported release

    850

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2020-11-19

  • Closed date

    2020-12-07

  • Last modified date

    2020-12-07

  • 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

[{"Line of Business":{"code":"LOB36","label":"IBM Automation"},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSEQTP","label":"WebSphere Application Server"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"850"}]

Document Information

Modified date:
08 December 2020