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https://issues.apache.org/jira/browse/MAPREDUCE-1829?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12874132#action_12874132
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Scott Chen commented on MAPREDUCE-1829:
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There is no unit test change because the code path is already tested by the
original unit tests.
> JobInProgress.findSpeculativeTask should use min() to find the candidate
> instead of sort()
> ------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-1829
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1829
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: jobtracker
> Affects Versions: 0.22.0
> Reporter: Scott Chen
> Assignee: Scott Chen
> Priority: Minor
> Fix For: 0.22.0
>
> Attachments: MAPREDUCE-1829.txt
>
>
> findSpeculativeTask needs only one candidate to speculate so it does not need
> to sort the whole list. It may looks OK but someone can still submit big jobs
> with small slow task thresholds. In this case, this sorting becomes expensive.
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