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https://issues.apache.org/jira/browse/MAPREDUCE-7252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17012011#comment-17012011
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Ahmed Hussein commented on MAPREDUCE-7252:
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Thanks [~jeagles] !
{\{TestMiniMRWithDFSWithDistinctUsers}} seems to fail intermittently.
> Handling 0 progress in SimpleExponential task runtime estimator
> ---------------------------------------------------------------
>
> Key: MAPREDUCE-7252
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-7252
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Ahmed Hussein
> Assignee: Ahmed Hussein
> Priority: Minor
> Fix For: 3.3.0, 3.1.4, 3.2.2, 2.10.1
>
> Attachments: MAPREDUCE-7252-branch-2.10.003.patch,
> MAPREDUCE-7252.001.patch, MAPREDUCE-7252.002.patch, MAPREDUCE-7252.003.patch
>
>
> The simple exponential runtime estimator (added in MAPREDUCE-7208) seems not
> to handle the corner cases where the delta progress is 0. As a result, the
> forecast will be NaN or Inf which messes up the subsequent forecast values.
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