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https://issues.apache.org/jira/browse/MAPREDUCE-4136?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13251853#comment-13251853
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Robert Joseph Evans commented on MAPREDUCE-4136:
------------------------------------------------
A similar fix was already done for MAPREDUCE-3790. I don't really know if this
is the same fix or not, but the patch only went into trunk, and
branch-0.23/branch-2. So it might be worth looking at to see if there is some
overlap between the two.
> 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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