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https://issues.apache.org/jira/browse/HADOOP-4998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12662272#action_12662272
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Arun C Murthy commented on HADOOP-4998:
---------------------------------------
Yes to both.
We would need to maintain a shell-based implementation for platforms which do
not the native implementations.
Having a JNI-based runtime would let us access runtime information in a
significantly more performant manner. For e.g. HADOOP-4656 could be implemented
by directly calling a native method which fetches groups via posix apis. The
absence of which forces us to cache the output of 'groups' shell command.
> 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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