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https://issues.apache.org/jira/browse/MAPREDUCE-1481?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon updated MAPREDUCE-1481:
-----------------------------------

    Attachment: TestStreamingDontConsumeInput.java

quickly built a testcase for this, though no patch yet - the code is somewhat 
spaghetti.

> Streaming should swallow IOExceptions when closing clientOut
> ------------------------------------------------------------
>
>                 Key: MAPREDUCE-1481
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1481
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: contrib/streaming
>    Affects Versions: 0.20.1, 0.21.0, 0.22.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: TestStreamingDontConsumeInput.java
>
>
> in PipeMapRed.mapRedFinished, streaming flushes and closes clientOut_, the 
> handle to the subprocess's stdin. If the subprocess has already exited or 
> closed its stdin, this will generate a Broken Pipe IOException. This causes 
> us to skip waitOutputThreads, which is incorrect, since the subprocess may 
> have data still written from stdout that needs to be read.

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