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https://issues.apache.org/jira/browse/MAPREDUCE-5541?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13792786#comment-13792786
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Benoy Antony commented on MAPREDUCE-5541:
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John ,
1. Could you please make these parameters { SPECULATIVE_PROGRESS ,
SPECULATIVE_FACTOR } configurable ?
2. Could you please share some test results indicating the improvement ?
> 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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