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https://issues.apache.org/jira/browse/MAPREDUCE-1060?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13072047#comment-13072047
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Jonathan Eagles commented on MAPREDUCE-1060:
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This patch is for 20-security only.
> JT should kill running maps when all the reducers have completed
> ----------------------------------------------------------------
>
> Key: MAPREDUCE-1060
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1060
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Reporter: Jothi Padmanabhan
> Assignee: Jonathan Eagles
> Fix For: 0.20.205.0
>
> Attachments: MAPREDUCE-1060-branch-0.20-security.manualtest.patch,
> MAPREDUCE-1060-branch-0.20-security.patch
>
>
> We have seen some situations where maps are still running when all the
> reducers have completed. This could happen because of lost TT's, interplay of
> speculative tasks with bad TT's etc. If the maps take a long time to run, it
> unnecessarily delays the job completion time, as this map output is not
> required anyways. The JT should possibly kill running maps when all the
> reducers have completed.
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