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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