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https://issues.apache.org/jira/browse/HADOOP-13709?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15569128#comment-15569128
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Eric Badger commented on HADOOP-13709:
--------------------------------------

The TestShell#testShellCommandTimerLeak failure in the precommit seems to be 
related to this patch. It fails with the patch due to timeout ~1/30 times, but 
0/100 without the patch. The failure is happening when the code gets blocked 
calling {{inReader.close()}}. Right above this code there is a comment about 
how there was a JDK 7 issue that caused a race with trying to close the stream, 
but that was supposedly fixed by the addition of {{synchronized (stdout)}}. 

> Clean up subprocesses spawned by Shell.java:runCommand when the shell process 
> exits
> -----------------------------------------------------------------------------------
>
>                 Key: HADOOP-13709
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13709
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 2.2.0
>            Reporter: Eric Badger
>            Assignee: Eric Badger
>         Attachments: HADOOP-13709.001.patch
>
>
> The runCommand code in Shell.java can get into a situation where it will 
> ignore InterruptedExceptions and refuse to shutdown due to being in I/O 
> waiting for the return value of the subprocess that was spawned. We need to 
> allow for the subprocess to be interrupted and killed when the shell process 
> gets killed. Currently the JVM will shutdown and all of the subprocesses will 
> be orphaned and not killed.



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