PM35274: LOCKTIMEOUTEXCEPTIONS WHEN USING THE WEBSPHERE XS DYNAMIC CACHE PLUGIN.

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • When using the WXS dynamic cache plugin, heavy simultaneous load
    may result in the ORB threads becoming exhausted, resulting in
    LockTimeoutExceptions.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  All users of the WebSphere eXtreme Scale    *
    *                  Dynamic cache provider.                     *
    ****************************************************************
    * PROBLEM DESCRIPTION: See "Error Description"                 *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    In WXS, a Put() operation requires a getForUpdate(), which
    locks the entry, followed by the put().  This activity
    takes place on the WXS client, resulting in multiple
    "hops" to the WXS server.   Under significant load the number
    of ORB threads on the WXS server may become exhausted with
    threads attempting to get a specific lock.   When this happens
    the client process that holds the lock will be unable to
    complete the getForUpdate()/Put() operations until an ORB
    thread becomes available.
    

Problem conclusion

  • The solution to this issue is to move the getForUpdate()/Put()
    activities into an Agent so that they will take place on the
    WXS server.   This eliminates the multiple "hops" and
    resulting ORB thread contention.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PM35274

  • Reported component name

    XD EXTREME SCAL

  • Reported component ID

    5724J3402

  • Reported release

    610

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2011-03-21

  • Closed date

    2011-03-28

  • Last modified date

    2011-03-28

  • 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

    XD EXTREME SCAL

  • Fixed component ID

    5724J3402

Applicable component levels

  • R710 PSY

       UP



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Document information


More support for:

WebSphere eXtreme Scale
General

Software version:

6.1

Reference #:

PM35274

Modified date:

2011-03-28

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