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From "Hong Tang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1608) Allow users to do speculative execution of a task manually
Date Fri, 19 Mar 2010 01:40:27 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12847195#action_12847195
] 

Hong Tang commented on MAPREDUCE-1608:
--------------------------------------

Interesting usage case. Are there other tasks running on the same node as the lone reduce
task? If yes, are they slower than their peers and perhaps that would be an indication the
node is ill-behaving and all tasks on that node should be speculatively executed?

> Allow users to do speculative execution of a task manually
> ----------------------------------------------------------
>
>                 Key: MAPREDUCE-1608
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1608
>             Project: Hadoop Map/Reduce
>          Issue Type: New Feature
>            Reporter: Scott Chen
>            Assignee: 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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