IBM Support

PH34977: INTELLIGENT MANAGEMENT ENABLED PLUGIN ATTEMPTS TOO MANY RETRIES WHEN APPLICATION WITH SESSION AFFINITY RETURNS 503.

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APAR status

  • Closed as program error.

Error description

  • Intelligent Management enabled Plugin attempts too many retries
    when application with session affinity returns 503.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  All users of IBM WebSphere Application      *
    *                  Server                                      *
    *                  using Intelligent  Management Enabled Web   *
    *                  Servers                                     *
    ****************************************************************
    * PROBLEM DESCRIPTION: For an affinity application attempting  *
    *                      to return a HTTP 503 to their client,   *
    *                      delays may be observed.                 *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    In the plugin's log it can be seen that retries are made for the
    same server equal to the number of endpoint in the odrGroup.
    The
    informational message 'http.summary' including
    'RESPONSE_READ_ERROR Retry' for the same endpoint will be
    observed.
    

Problem conclusion

  • One fix and two improvements have been made.  First affinity
    will be broken and retires will only be made up to the number of
    endpoints able to service the request.  Two tune-able properties
    have been added to allow custom limiting of the amount of
    retries.  The first of these, 'MaxTargetEndpointsPerRequest',
    globally limits the number of attempts for a request for any
    reason.  Acceptable values for this property are 1 or more.  The
    second of these, 'Request503Retry', globally limits the number
    of retries Http 503 responses from the application servers. The
    acceptable values for this property are 0 or more.
    
    The fix for this APAR is targeted for inclusion in fix pack
    8.5.5.20 & 9.0.5.8. 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

    PH34977

  • Reported component name

    WEBS APP SERV N

  • Reported component ID

    5724H8800

  • Reported release

    900

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2021-03-02

  • Closed date

    2021-06-07

  • Last modified date

    2021-06-07

  • 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

    WEBS APP SERV N

  • Fixed component ID

    5724H8800

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":"900"}]

Document Information

Modified date:
08 June 2021