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IC66490: EXCESSIVE MEMORY USAGE WHEN USING MEDIATION SUBFLOWS

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • If a WebSphere Enterprise Service Bus or WebSphere Process
    Server v6.2 or V7 flow contains a mediation module with one or
    more subflow mediation primitives with multiple paths through
    the flow to reach that primitive this will involve a large
    memory usage and may result in an OutofMemoryError exception.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: Users of WebSphere Enterprise Service Bus    *
    *                 or WebSphere Process Server v6.2 or v7 who   *
    *                 use a mediation module with subflow          *
    *                 mediation primitives that can be invoked     *
    *                 by multiple paths in the flow and who are    *
    *                 seeing OutOfMemoryError exceptions.          *
    ****************************************************************
    * PROBLEM DESCRIPTION: When a mediation module contains a      *
    *                      subflow that can be invoked through     *
    *                      multiple paths this can result in       *
    *                      excessive memory usage as a copy of     *
    *                      the subflow is loaded into memory for   *
    *                      each possible branch of the flow that   *
    *                      can invoke it. This can result in an    *
    *                      OutOfMemoryError exception being seen.  *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    If a WebSphere Enterprise Server Bus or WebSphere Process
    Server flow contains a mediation module with a subflow
    mediation primitive where there are multiple paths through the
    flow to reach that primitive then on first invocation of the
    mediation flow, a copy of the subflow is loaded in to memory
    for each path.
    This results in excessive memory usage. This may result in an
    OutOfMemoryError Exception depending on the number of subflow
    mediation primitives, by the complexity of those subflows, and
    by having multiple concurrent requests. A heap dump will show
    large numbers of RequestFlowModel objects.
    

Problem conclusion

  • The code was modified such that each subflow is only loaded
    into memory once.
    
    There are no known side effects associated with this fix.
    There is no known alternative workaround should you encounter
    this problem.
    
    This code fix was targeted to be included in the following fix
    packs:
         6.2.0 Fix Pack 3 (v6.2.0.3)
         7.0.0 Fix Pack 2 (v7.0.0.2)
    

Temporary fix

Comments

APAR Information

  • APAR number

    IC66490

  • Reported component name

    WEB ESB FOR WIN

  • Reported component ID

    5724I8200

  • Reported release

    620

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2010-02-19

  • Closed date

    2010-03-02

  • Last modified date

    2010-04-22

  • 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

    WEB ESB FOR WIN

  • Fixed component ID

    5724I8200

Applicable component levels

  • R100 PSN

       UP

  • R200 PSN

       UP

  • R300 PSN

       UP

  • R612 PSN

       UP

  • R620 PSY

       UP

  • R700 PSY

       UP

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Document Information

Modified date:
30 March 2023