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https://issues.apache.org/jira/browse/HADOOP-9894?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13752738#comment-13752738
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Suresh Srinivas commented on HADOOP-9894:
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+1 for the change.
> Race condition in Shell leads to logged error stream handling exceptions
> ------------------------------------------------------------------------
>
> Key: HADOOP-9894
> URL: https://issues.apache.org/jira/browse/HADOOP-9894
> Project: Hadoop Common
> Issue Type: Bug
> Components: util
> Affects Versions: 2.1.0-beta
> Reporter: Jason Lowe
> Attachments: hadoop-9894.01.patch
>
>
> Shell.runCommand starts an error stream handling thread and normally joins
> with it before closing the error stream. However if parseExecResult throws
> an exception (e.g.: like Stat.parseExecResult does for FileNotFoundException)
> then the error thread is not joined and the error stream can be closed before
> the error stream handling thread is finished. This causes the error stream
> handling thread to log an exception backtrace for a "normal" situation.
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