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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5541) Improved algorithm for whether need speculative task
Date Tue, 22 Oct 2013 00:50:42 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5541?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13801360#comment-13801360
] 

Arun C Murthy commented on MAPREDUCE-5541:
------------------------------------------

[~zhaoyunjiong] The patch looks good. Can you pls share your experience running with this
patch? What kind of tests have you done? Tx.

> 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, 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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