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From "Scott Chen (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-1608) Allow users to do speculative execution of a task manually
Date Fri, 19 Mar 2010 00:28:27 GMT
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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