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From "Scott Chen (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-1829) JobInProgress.findSpeculativeTask should use min() to find the candidate instead of sort()
Date Wed, 02 Jun 2010 05:40:37 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-1829?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Scott Chen updated MAPREDUCE-1829:
----------------------------------

    Status: Open  (was: Patch Available)

> 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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