IBM Support

PH41615: INTELLIGENT MANAGEMENT WEBSERVER PLUGIN IS SOMETIMES UNABLE TO ROUTE ONE HTTP SESSION REQUESTS TO THE SAME MEMBER SERVER.

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APAR status

  • Closed as program error.

Error description

  • The Intelligent management webserver plugin is sometimes
    unable
    to route one HTTP session requests to the same member server
    after the collective member server is restarted. One session
    requests are routed to two member servers randomly.
    

Local fix

  • Try to restart the member server(s) again.
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  All users of IBM WebSphere Application      *
    *                  Server Liberty- Virtual Enterprise/IM       *
    *                  Component                                   *
    ****************************************************************
    * PROBLEM DESCRIPTION: Intelligent Management enabled plugin   *
    *                      intermittently fails to route to        *
    *                      WebSphere Liberty collective member     *
    *                      server after a server restart           *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    Intelligent Management enabled plugin intermittently fails to
    route to WebSphere Liberty collective member server after a
    server restart. Symptoms include lack of traffic being routed to
    the affected member server after all the application endpoints
    have been published.  The root cause is a failure to publish a
    server's HTTPSession "cloneID" prior to publishing endpoints.
    
    When this issue occurs, the collective controller logs will
    always contain this message:
    
    RoutingInfoMa 3   Failed getting cloneID, set to default.
    Exception = java.util.NoSuchElementException: Node
    /sys.was.collectives/local/hosts/<users-
    host>/userdirs/opt/IBM/Liberty/wlp/usr/servers/<users-
    server>/sys.mbeans/WebSphere:name=com.ibm.ws.jmx.mbeans.sessionM
    anagerMBean/attributes/CloneID does not exist
    

Problem conclusion

  • Collective member servers must publish their  HTTPSession
    "cloneId" to the collective controller before publishing
    application endpoint routing information.  The Intelligent
    Management runtime collective member code has been corrected to
    enforce the ordering of publishing
    information to the collective controller, including cloneID's
    and application routing endpoint information.
    
    The fix for this APAR is currently targeted for inclusion in fix
    pack 22.0.0.2.  Please refer to the Recommended Updates page for
    delivery information:
    http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
    

Temporary fix

  • Restarted the affected server(s) so that no "CloneID does not
    exist" message appears in the collective controller logs, and
    that routing resumes correctly.
    

Comments

APAR Information

  • APAR number

    PH41615

  • Reported component name

    LIBERTY PROFILE

  • Reported component ID

    5724J0814

  • Reported release

    CD0

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2021-10-27

  • Closed date

    2022-01-12

  • Last modified date

    2022-01-12

  • 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

    LIBERTY PROFILE

  • Fixed component ID

    5724J0814

Applicable component levels

[{"Line of Business":{"code":"LOB45","label":"Automation"},"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSEQTP","label":"WebSphere Application Server"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"CD0"}]

Document Information

Modified date:
13 January 2022