Allow users to do speculative execution of a task manually
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Key: MAPREDUCE-1608
URL: https://issues.apache.org/jira/browse/MAPREDUCE-1608
Project: Hadoop Map/Reduce
Issue Type: New Feature
Reporter: Scott Chen
Speculative execution improves the latency of the job. Sometimes the job has
few very slow reducers. Spending a little more resource on speculative tasks
can improve the latency a lot. It will be nice that the users can manually
select one task and force the speculative execution on that task just like we
can manually kill/fail task.
The proposal is add link says "speculate" in taskdetails.jsp page where we do
"kill/fail".
Thoughts?
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