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PI41788: CONTROL_REGION_DREG_ON_NO_SRS=1 NOT WORKING AS EXPECTED WHEN AN ADJUNCT REGION IS ACTIVE BUT SERVANT REGIONS ARE NOT

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APAR status

  • Closed as program error.

Error description

  • HTTP Requests that are received by the control region when the
    adjunct region is available but the servant is unavailable are
    not immediately rejected as specified by
    control_region_dreg_on_no_srs=1
    
    If the adjunct region is disabled and the servant region is not
    available requests are handled as expected.
    
    The problem is that a primitive method is invoked to obtain the
    number of currently active servants. This method does not
    exclude the Adjunct from the count. The adjunct region is
    really a type of a servant.   So, in the code that would
    trigger the auto-pause listener code when the servant
    terminated, it still detected an active servant--the adjunct.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  All users of IBM WebSphere Application      *
    *                  Server V8.5                                 *
    ****************************************************************
    * PROBLEM DESCRIPTION: WebSphere Application server for z/OS   *
    *                      configured with an adjunct may not      *
    *                      engage auto-pausing of listeners.       *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    The automatic pausing of the listeners within the controller
    can be enabled with the control_region_dreg_on_no_srs
    environment variable.
    When a WebSphere Application Server for z/OS server is
    configured to use an adjunct region, the adjunct is mistakenly
    included in the count of active servants within the auto-pause
    and auto-resume code.   In a server with a failed servant, but
    active adjunct, it may appear that a servant is available to
    process work and thus avoid triggering the auto-pause of the
    listeners.
    

Problem conclusion

Temporary fix

Comments

APAR Information

  • APAR number

    PI41788

  • Reported component name

    WEBSPHERE FOR Z

  • Reported component ID

    5655I3500

  • Reported release

    850

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2015-05-26

  • Closed date

    2015-06-03

  • Last modified date

    2015-06-03

  • 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 FOR Z

  • Fixed component ID

    5655I3500

Applicable component levels

  • R850 PSY

       UP

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Document Information

Modified date:
28 April 2022