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https://issues.apache.org/jira/browse/HADOOP-4998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12794216#action_12794216
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Eli Collins commented on HADOOP-4998:
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Thanks for taking a look Todd, will incorporate your feedback. The code isn't
polished (eg I just copied executeShellCommand and toString from
UnixUserGroupInformation, the naming eg getUsername vs getUserName needs to be
improved, haven't tested the C code on multiple platforms, etc), just want to
get feedback on the overall approach first, the patch is just to show what a
Platform class would look like and how it could be implemented. Think the
patches should be staged in phases, eg first move the existing code that uses
Shell over to the new API (w/o changing any functionality) and then add new
native implementations individually.
bq. Less specific: thoughts on making this into an interface, with an
implementation for JniPlatformCall and ShellPlatformCall? This may be handy if
someone wants to come along and implement WindowsPlatformCall or
SolarisShellPlatformCall, etc.
JNI supports multiple platforms so we should be able to have Posix and Windows
implementations of libnativecall (PlatformCall.c). Perhaps though we make
Platform an interface with JNI and Shell implementations.
> Implement a native OS runtime for Hadoop
> ----------------------------------------
>
> Key: HADOOP-4998
> URL: https://issues.apache.org/jira/browse/HADOOP-4998
> Project: Hadoop Common
> Issue Type: New Feature
> Components: native
> Reporter: Arun C Murthy
> Assignee: Arun C Murthy
> Fix For: 0.21.0
>
> Attachments: hadoop-4998-1.patch
>
>
> 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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