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Posted to mapreduce-issues@hadoop.apache.org by "zhaoyunjiong (JIRA)" <ji...@apache.org> on 2013/09/26 15:07:02 UTC

[jira] [Updated] (MAPREDUCE-5541) Improved algorithm for whether need speculative task

     [ https://issues.apache.org/jira/browse/MAPREDUCE-5541?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

zhaoyunjiong updated MAPREDUCE-5541:
------------------------------------

    Summary: Improved algorithm for whether need speculative task  (was: improved algorithm for whether need speculative task)
    
> Improved algorithm for whether need speculative task
> ----------------------------------------------------
>
>                 Key: MAPREDUCE-5541
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5541
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: mrv1
>    Affects Versions: 1.2.1
>            Reporter: zhaoyunjiong
>            Assignee: zhaoyunjiong
>             Fix For: 1.2.2
>
>         Attachments: MAPREDUCE-5541-branch-1.2.patch
>
>
> Most of time, tasks won't start running at same time.
> In this case hasSpeculativeTask in TaskInProgress not working very well.
> Some times, some tasks just start running, and scheduler already decide it need speculative task to run.
> And this waste a lot of resource.

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