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IT03931: DATAPOWER MIGHT INTERMITTENTLY FAIL TO PARSE DATA FROM THE DOCUMENT CACHE WHEN CONSTANTLY AT MAXIMUM XML NAME LIMIT

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APAR status

  • Closed as program error.

Error description

  • There is a hard limit of XML Names usage on DataPower set at
    65535.  Users can set a warning in the throttle settings
    (Administration>Device>Throttle Settings) which will establish
    the threshold of minimal available XML Names (in percent), for
    any of the three types of XML Names. As this threshold is
    approached, the system attempts to free unused XML Name
    resources, so that this threshold is never reached.
    
    DataPower will begin garbage collection early enough
    to attempt to complete garbage collection before the
    specified threshold. If the threshold is continuously being
    met, this will put DataPower in a state of constant garbage
    collection.
    
    
    In this state of constant garbage collection, DataPower might
    intermittently fail to parse documents stored in the document
    cache.
    
    When in this state, users will see error messages in their logs
    such as:
    
    throttle(Throttler): tid(36647565): The XML Name count is high,
    and the system is working on freeing some of them, but has not
    completed yet. (2)
    

Local fix

  • The immediate workaround could be to move the XML Names
    threshold lower until constant garbage collection stops.
    
    The next recommendation is to disable any unused domains, save
    config,  shutdown reload to decrease the XML Name footprint by
    the configuration.
    
    The long term solutions is to:
    
      a) Optimize configuration's XML Names footprint by removing
    any  extraneous services, redundant schema/wsdls, etc.
      b) Separate Services across appliances to better utilize XML
    Names capacity under the garbage collection threshold.
    

Problem summary

  • Affected is building an XML tree in processing.
    
    If that happens exactly when an XML names freeing cycle starts,
    this can result in loss of that XML tree.
    

Problem conclusion

Temporary fix

Comments

APAR Information

  • APAR number

    IT03931

  • Reported component name

    DTPWR INTGRAPL

  • Reported component ID

    DP905XI52

  • Reported release

    600

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2014-08-21

  • Closed date

    2014-11-11

  • Last modified date

    2014-11-20

  • 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

    DTPWR INTGRAPL

  • Fixed component ID

    DP905XI52

Applicable component levels

  • R500 PSY

       UP

  • R600 PSY

       UP

  • R601 PSY

       UP

  • R700 PSY

       UP

  • R710 PSY

       UP



Document information

More support for: WebSphere DataPower Integration Appliance XI52

Software version: 6.0.0

Reference #: IT03931

Modified date: 20 November 2014