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https://issues.apache.org/jira/browse/MAPREDUCE-2642?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13082924#comment-13082924
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Josh Wills commented on MAPREDUCE-2642:
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Apologies Arun-- re-gen'd patch attached.

> Fix two bugs in v2.app.speculate.DataStatistics
> -----------------------------------------------
>
>                 Key: MAPREDUCE-2642
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2642
>             Project: Hadoop Map/Reduce
>          Issue Type: Sub-task
>          Components: mrv2
>            Reporter: Josh Wills
>            Assignee: Josh Wills
>            Priority: Minor
>         Attachments: MAPREDUCE-2642.patch, MR-2642-1.patch
>
>
> Fixes two bugs in DataStatistics: a divide by zero in the variance 
> calculation when count == 0, and a synchronization issue in how the 
> updateStatistics method was implemented.

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