PM80182: Overload can occur when a configured limit on the number of replica shards exceeds the total ideal shard count.

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APAR status

  • Closed as program error.

Error description

  • The maximum number of replica shards that you configured
    exceeds the total ideal shard count.
    

Local fix

  • n/a
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  Any eXtreme Scale user, especially those    *
    *                  who use zones, or many containers that      *
    *                  exist on multiple machines when zone are    *
    *                  not employed.                               *
    ****************************************************************
    * PROBLEM DESCRIPTION: Containers can be overloaded with       *
    *                      data in certain bring up scenarios.     *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    In this scenario, a minimum number of initial containers is
    satisfied, and placement is not suspended.  When you start a
    domain, where multiple containers with data are
    already established, you start a single container in either an
    additional zone or an additional machine where zones are not
    employed. The catalog service attempts to place all the
    replicas for the containers in the initial zone (or machine)
    on the new container. This scenario can overload the heap of
    that new container, and lead to an Out of Memory error.
    

Problem conclusion

  • Fix is provided to recognize the maximum number of shard
    replicas instead of the ideal shard count than an individual
    container can hold, to prevent overload.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PM80182

  • Reported component name

    WS EXTREME SCAL

  • Reported component ID

    5724X6702

  • Reported release

    711

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-01-09

  • Closed date

    2013-01-29

  • Last modified date

    2013-01-29

  • 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

    WS EXTREME SCAL

  • Fixed component ID

    5724X6702

Applicable component levels

  • R850 PSY

       UP

  • R860 PSY

       UP



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Document information


More support for:

WebSphere eXtreme Scale

Software version:

711

Reference #:

PM80182

Modified date:

2013-01-29

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