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https://issues.apache.org/jira/browse/HADOOP-4998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12662245#action_12662245
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Doug Cutting commented on HADOOP-4998:
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Arun> It would be useful to implement a JNI-based runtime [ ... ]
What do you mean by 'useful'? Is this about performance?
Arun> This would allow us to stop relying on exec'ing bash [ ... ]
It would only allow this on platforms where the native library is built, right?
So, unless we intend to support this on Windows, Solaris and MacOS, we still
have to maintain the shell-based implementations too.
> Implement a native OS runtime for Hadoop
> ----------------------------------------
>
> Key: HADOOP-4998
> URL: https://issues.apache.org/jira/browse/HADOOP-4998
> Project: Hadoop Core
> Issue Type: New Feature
> Components: native
> Reporter: Arun C Murthy
> Assignee: Arun C Murthy
> Fix For: 0.21.0
>
>
> It would be useful to implement a JNI-based runtime for Hadoop to get access
> to the native OS runtime. This would allow us to stop relying on exec'ing
> bash to get access to information such as user-groups, process limits etc.
> and for features such as chown/chgrp (org.apache.hadoop.util.Shell).
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