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https://issues.apache.org/jira/browse/MAPREDUCE-6303?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14392987#comment-14392987
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Junping Du commented on MAPREDUCE-6303:
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+1. Patch LGTM. Will commit it shortly.

> Read timeout when retrying a fetch error can be fatal to a reducer
> ------------------------------------------------------------------
>
>                 Key: MAPREDUCE-6303
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6303
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 2.6.0
>            Reporter: Jason Lowe
>            Assignee: Jason Lowe
>            Priority: Blocker
>         Attachments: MAPREDUCE-6303.001.patch
>
>
> If a reducer encounters an error trying to fetch from a node then encounters 
> a read timeout when trying to re-establish the connection then the reducer 
> can fail.  The read timeout exception can leak to the top of the Fetcher 
> thread which will cause the reduce task to teardown.  This type of error can 
> repeat across reducer attempts causing jobs to fail due to a single bad node.



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