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https://issues.apache.org/jira/browse/MAPREDUCE-4136?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13291260#comment-13291260
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Matteo Bertozzi commented on MAPREDUCE-4136:
--------------------------------------------
Yes this is fixed with MAPREDUCE-3790, the IOException during
clientOut._flush() is now catched.
> Hadoop streaming might succeed even through reducer fails
> ---------------------------------------------------------
>
> Key: MAPREDUCE-4136
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4136
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: contrib/streaming
> Affects Versions: 0.20.205.0
> Reporter: Wouter de Bie
> Attachments: mapreduce-4136.patch
>
>
> Hadoop streaming can even succeed even though the reducer has failed. This
> happens when Hadoop calls {{PipeReducer.close()}}, but in the mean time the
> reducer has failed and the process has died. When {{clientOut_.flush()}}
> throws an {{IOException}} in {{PipeMapRed.mapRedFinish()}} this exception is
> caught but only logged. The exit status of the child process is never checked
> and task is marked as successful.
> I've attached a patch that seems to fix it for us.
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