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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4998) Implement a native OS runtime for Hadoop
Date Fri, 09 Jan 2009 20:03:59 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12662500#action_12662500

Doug Cutting commented on HADOOP-4998:

> If we have access to poll(), we would just us that for Hadoop's blocking IO on non-blocking

Should each of these be a separate issue?

We currently have an optional libhadoop.  If we want to add more to it, I can see proceeding
in one of a few ways:
 - adding more optional optimizations there, on a case-by-case basis; or
 - replace all shell access with native code, replacing the reliance on bash with reliance
on a native library.

But adding a few more optional optimizations doesn't seem like a single coherent issue and
would better be addressed by more specific jiras, no?

> 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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