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https://issues.apache.org/jira/browse/YARN-1395?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13818240#comment-13818240
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Chris Nauroth commented on YARN-1395:
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The reason for this is that the external process never exits, because the
parent process is not consuming stdout. {{Shell#execCommand}} from
hadoop-common already handles consuming the streams correctly, so we can switch
to using that instead of working with the {{Process}} object directly. I have
a patch in progress.
> Distributed shell application master launched with debug flag can hang
> waiting for external ls process.
> -------------------------------------------------------------------------------------------------------
>
> Key: YARN-1395
> URL: https://issues.apache.org/jira/browse/YARN-1395
> Project: Hadoop YARN
> Issue Type: Bug
> Components: applications/distributed-shell
> Affects Versions: 3.0.0, 2.2.0
> Reporter: Chris Nauroth
> Assignee: Chris Nauroth
>
> Distributed shell launched with the debug flag will run
> {{ApplicationMaster#dumpOutDebugInfo}}. This method launches an external
> process to run ls and print the contents of the current working directory.
> We've seen that this can cause the application master to hang on
> {{Process#waitFor}}.
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