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PH08548: THE NUMBER OF CONCURRENT SUB JOBS RUNNING UNDER A TOP-LEVEL BATCH JOB MAY EXCEED THE CONFIGURED MAXIMUM

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • Even with com.ibm.ws.batch.parallel.MAXIMUM_CONCURRENT_SUBJOBS
    set to a value of 1, a WebSphere Application Server Batch
    top-level job was observed running more than one sub job
    concurrently.
    

Local fix

  • Setting the WebSphere variable
    GRID_ENDPOINT_PJM_JOB_STATUS_WAIT_INTERVAL
    to a higher value on the endpoint servers may reduce the
    liklihood of hitting the window in which the code inadvertantly
    allows additional subjobs to be run
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  All users of IBM WebSphere Application      *
    *                  Server Java Batch                           *
    ****************************************************************
    * PROBLEM DESCRIPTION: The value of the                        *
    *                      com.ibm.ws.batch.parallel.MAXIMUM_CONCU *
    *                      RRENT_SUBJOBS property specifies the    *
    *                      maximum number of sub jobs that can     *
    *                      run concurrently.  However, a timing    *
    *                      issue can occur where this can be       *
    *                      exceeded.                               *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    The top level job handles the submission and completion
    processing of sub jobs.  Only the number of subjobs specified
    by the com.ibm.ws.batch.parallel.MAXIMUM_CONCURRENT_SUBJOBS
    should be running at once.  However, a timing issue exists
    such that this could be exceeded.  There is a fallback type of
    check in place that is intended to handle the case where the
    top level job does not receive a notification that a subjob
    has completed.  Periodically, if the top level job sees that
    it has not received a notification in some time, it will query
    the sub job status.  If it sees that it is complete, it will
    release a job from the queue to start running.  If this check
    and release happens just at the right time while the job
    completes through the normal channel of communication, this is
    where the extra job can be submitted.
    

Problem conclusion

  • A code update has been to synchronize the handling of missed
    notifications, such that an extra job beyond the specified
    concurrent sub jobs limit can no longer be submitted.
    
    The fix for this APAR is currently targeted for inclusion in
    fix pack 9.0.5.0 and 8.5.5.16  Please refer to the Recommended
    Updates page for delivery information:
    http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
    

Temporary fix

Comments

APAR Information

  • APAR number

    PH08548

  • Reported component name

    WEBSPHERE FOR Z

  • Reported component ID

    5655I3500

  • Reported release

    850

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2019-02-13

  • Closed date

    2019-05-23

  • Last modified date

    2019-05-23

  • 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

[{"Business Unit":{"code":"BU053","label":"Cloud \u0026 Data Platform"},"Product":{"code":"SS7K4U","label":"WebSphere Application Server for z\/OS"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"850","Line of Business":{"code":"LOB36","label":"IBM Automation"}}]

Document Information

Modified date:
14 October 2021