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From "yunjiong zhao (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MAPREDUCE-5541) Improved algorithm for whether need speculative task
Date Wed, 09 Nov 2016 18:13:58 GMT

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

yunjiong zhao resolved MAPREDUCE-5541.
--------------------------------------
    Resolution: Won't Fix

> 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: yunjiong zhao
>            Assignee: yunjiong zhao
>         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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