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From "Scott Chen (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-1829) JobInProgress.findSpeculativeTask should use min() to find the candidate instead of sort()
Date Tue, 01 Jun 2010 18:05:42 GMT
JobInProgress.findSpeculativeTask should use min() to find the candidate instead of sort()
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                 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


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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