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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-6303) Read timeout when retrying a fetch error can be fatal to a reducer
Date Thu, 02 Apr 2015 17:24:55 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-6303?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14392987#comment-14392987
] 

Junping Du commented on MAPREDUCE-6303:
---------------------------------------

+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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