[jira] Commented: (HADOOP-4998) Implement a native OS runtime for Hadoop

["Vinod K V (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-4998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12662243#action_12662243 ] 

Vinod K V commented on HADOOP-4998:
-----------------------------------

+1.

Of late, there have been many instances in which Mapred, particualrly the TT side, started to depend on platform specific features. I guess the handling of these can be made much easier with such a native runtime. Some of them I can immediately think of are memory management of tasks by TT(HADOOP-3581), starting tasks via job control(HADOOP-2721), starting tasks as the job submitting user(HADOOP-4490). But I am not very sure as to which of these and how much of it can be helped by a native runtime.

> 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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