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Posted to mapreduce-dev@hadoop.apache.org by "zhaoyunjiong (JIRA)" <ji...@apache.org> on 2013/09/26 14:43:02 UTC

[jira] [Created] (MAPREDUCE-5541) improved algorithm for whether need speculative task

zhaoyunjiong created MAPREDUCE-5541:
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             Summary: 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
            Reporter: zhaoyunjiong
            Assignee: zhaoyunjiong


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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