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Posted to mapreduce-dev@hadoop.apache.org by "yunjiong zhao (JIRA)" <ji...@apache.org> on 2016/11/09 18:13:58 UTC
[jira] [Resolved] (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 ]
yunjiong zhao resolved MAPREDUCE-5541.
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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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