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https://issues.apache.org/jira/browse/HADOOP-4998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12662483#action_12662483
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Doug Cutting commented on HADOOP-4998:
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> Are you asking whether those invocations take a big portion of execution time
> in the real application?
Yes, precisely.
If HADOOP-4656 is the motivating case, then, after HADOOP-4656, the namenode
might become nearly unusably slow without native code, which would be a
significant negative change. So, for HADOOP-4656, we might instead change the
default to, e.g., read /etc/group rather than exec a command.
In general, it's best to design things so that we do not require native code
for decent performance.
> 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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