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PI77612: J2CA0045E CONNECTIONTIMEOUT HAPPENS TOO OFTEN AFTER UPGRADING TO 8.5.5.11

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • Customer production system behaving differently in version
    8.5.5.11. The connections are not freed and end up getting
    connectiontimeout exception very few minutes after starting the
    server.
    
    The maxconnection set to 1000 and the
    numberOfSharedPoolPartitions is set to 200. The 200 is way too
    low to handle the maxconnection of 1000. Prior to 8.5.5.10 we
    ignored SharedPoolPartitions value in the advancedconnection
    pool setting and calculated the value based on Maxconnection.
    For example, in this case it will be calculated as 2000(1000 max
    * 2) oppose to 200.
    

Local fix

  • The workaround is set to the following values to zero inorder
    for connection pooling to calculate the value.
    
    numberOfSharedPoolPartitions="0"
    numberOfUnsharedPoolPartitions="0"
    numberOfFreePoolPartitions="0"
    freePoolDistributionTableSize="0"
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  All users of IBM WebSphere Application      *
    *                  Server using advanced connection pool       *
    *                  properties.                                 *
    ****************************************************************
    * PROBLEM DESCRIPTION: Free pool distribution size and         *
    *                      free pool partions were not being set   *
    *                      to the correct values resulting in      *
    *                      performance issues                      *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    The free pool distribution size and free pool partions are
    normally set by the connection pool using default values which
    are the best performance setting.  In some cases, the
    properties do need to be set and the setting were not being
    used.
    

Problem conclusion

  • Setting the free pool distribution size and free pool partions
    now will set the user values.   In general the values should
    not be used to allow the connection pool to default the
    values.  If a resource adapter supports reauthetication, then
    the free pool distribution size can be set to 1 which may help
    to keep the connection pool reduced in size, but this only
    applies to an idle connection pool or test system.  In most
    production systems, connection are being used at a steady
    state meaning there may be no difference in performance if the
    free pool distribution size is to 1 or the connection pool is
    allow to set it using its defaults.
    
    The fix for this APAR is currently targeted for inclusion in
    fix pack 7.0.0.43, 8.0.0.14, 8.5.5.12 and 9.0.0.5.  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

    PI77612

  • Reported component name

    WEBSPHERE APP S

  • Reported component ID

    5724J0800

  • Reported release

    850

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2017-03-06

  • Closed date

    2017-05-10

  • Last modified date

    2017-05-11

  • 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 APP S

  • Fixed component ID

    5724J0800

Applicable component levels

  • R700 PSY

       UP

  • R800 PSY

       UP

  • R850 PSY

       UP

  • R900 PSY

       UP



Document information

More support for: WebSphere Application Server
General

Software version: 850

Reference #: PI77612

Modified date: 11 May 2017