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https://issues.apache.org/jira/browse/MAPREDUCE-1608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12933043#action_12933043
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Arun C Murthy commented on MAPREDUCE-1608:
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Scott, thanks for bringing that to my attention, I wasn't aware of that. That
is a highly dangerous knob - I'll open a jira to make it cluster-specific and
not user-specific.
> 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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