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PI74201: Collections.synchronizedMap does not perform as well as it could under high load

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APAR status

  • Closed as program error.

Error description

  • Improve performence under high concurrent load by replacing
    a Collections.synchronizedMap with a ConcurrentHashMap
    

Local fix

  • N/A
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  All users of IBM WebSphere Application      *
    *                  Server                                      *
    ****************************************************************
    * PROBLEM DESCRIPTION: To improve performence under high       *
    *                      concurrent load we are replacing        *
    *                      a Collections.synchronizedMap with a    *
    *                      ConcurrentHashMap                       *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    Collections.synchronizedMap uses more agressive thread locking
    than a ConcurrentHashMap so we made some modifications to
    allow us to use a ConcurrentHashMap.
    

Problem conclusion

Temporary fix

Comments

APAR Information

  • APAR number

    PI74201

  • Reported component name

    WEBS APP SERV N

  • Reported component ID

    5724H8800

  • Reported release

    850

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2016-12-27

  • Closed date

    2017-02-02

  • Last modified date

    2017-02-02

  • 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

    WEBS APP SERV N

  • Fixed component ID

    5724H8800

Applicable component levels

  • R800 PSY

       UP

  • R850 PSY

       UP

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Document Information

Modified date:
28 April 2022