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https://issues.apache.org/jira/browse/HADOOP-9752?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13766423#comment-13766423
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Robert Parker commented on HADOOP-9752:
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This appears to be a bug in procps-ng based on
http://www.freelists.org/post/procps/PATCH-33-kill-fix-PID-handling, and has
been fixed in procps-ng-3.3.4 according to
https://bugs.launchpad.net/ubuntu/+source/coreutils/+bug/1077796. I will
download that version and test.
> Latest Ubuntu (13.04) /bin/kill parameter for process group requires a
> 'double dash kill -0 -- -<pid>
> ------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-9752
> URL: https://issues.apache.org/jira/browse/HADOOP-9752
> Project: Hadoop Common
> Issue Type: Bug
> Components: util
> Affects Versions: 3.0.0, 2.0.4-alpha
> Reporter: Robert Parker
>
> This changed on Ubuntu 12.10 and later. This prevents the kill command from
> executing correctly in Shell.java.
> There is a bug filed in Ubuntu but there is not much activity.
> https://bugs.launchpad.net/ubuntu/+source/coreutils/+bug/1077796
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