[jira] [Updated] (MAPREDUCE-2639) MR-279: Fixup the exponentially smoothed runtime estimator, fix a couple of bugs in DataStatistics, and do a little bit of cleanup.

["Josh Wills (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAPREDUCE-2639?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Josh Wills updated MAPREDUCE-2639:
----------------------------------

    Attachment: MAPREDUCE-2639.patch

> MR-279: Fixup the exponentially smoothed runtime estimator, fix a couple of bugs in DataStatistics, and do a little bit of cleanup.
> -----------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-2639
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2639
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: mrv2
>         Environment: All
>            Reporter: Josh Wills
>            Assignee: Josh Wills
>            Priority: Minor
>         Attachments: MAPREDUCE-2639.patch
>
>
> A catch-all JIRA for a pass I took through the v2.app.speculate package.
> 1) Fixed the ExponentiallySmoothedTaskRuntimeEstimator so that it can run and pass the test defined in TestRuntimeEstimators.
> 2) Fixed two bugs in DataStatistics: 1) a divide by zero in the variance calculation in the case that count == 0 and 2) a synchronization issue in how the updateStatistics method was implemented,
> 3) A bunch of typo corrections, formatting fixes, and adding some consistency around the null value checking.
> I probably need to do a couple more passes through this code to get it into better shape, but this seemed like a good start. Will attach my patch momentarily.

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