PM83566: In a large environment, LockTimeoutException exceptions might occur in the OSGiGridAccessor.reportRanking() method.

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APAR status

  • Closed as program error.

Error description

  • In an eXtreme Scale deployment that uses many partitions,
    LockTimeoutException exceptions might occur in the
    OSGiGridAccessor.reportRanking() method. These exceptions
    occur during partition startup, either when a contain fails
    over or during the initial start of the container.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  Users of WebSphere eXtreme Scale with       *
    *                  applications that use OSGi services         *
    *                  that implement container server-side        *
    *                  plug-ins in the object grid configuration.  *
    ****************************************************************
    * PROBLEM DESCRIPTION: A large grid environment with a         *
    *                      hundred or more partitions might        *
    *                      experience LockTimeoutExceptions        *
    *                      during start-up processing.             *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    During retrieval and storage of metadata that is associated
    with OSGi ranking information for OSGi service, the
    OSGiGridAccessor.reportRanking() method uses the
    getForUpdate() method to acquire a lock when the lock is not
    required. Then, an update operation does not occur. Also,
    the OSGiGridAccessor.reportRanking() method does not retry in
    the event of transient network issues or exceptions.
    

Problem conclusion

  • The OSGiGridAccessor.reportRanking() method was modified to
    use an appropriate level of locking and retry attempts when
    transient error conditions occur.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PM83566

  • Reported component name

    WS EXTREME SCAL

  • Reported component ID

    5724X6702

  • Reported release

    850

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-02-25

  • Closed date

    2013-02-28

  • Last modified date

    2013-02-28

  • 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

    WS EXTREME SCAL

  • Fixed component ID

    5724X6702

Applicable component levels

  • R850 PSY

       UP



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Document information


More support for:

WebSphere eXtreme Scale

Software version:

850

Reference #:

PM83566

Modified date:

2013-02-28

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