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From Praveen Sripati <praveensrip...@gmail.com>
Subject Re: Security at file level in Hadoop
Date Wed, 22 Feb 2012 15:06:50 GMT
According to this (http://goo.gl/rfwy4)

> Prior to 0.22, Hadoop uses the 'whoami' and id commands to determine the
user and groups of the running process.

How does this work now?

Praveen

On Wed, Feb 22, 2012 at 6:03 PM, Joey Echeverria <joey@cloudera.com> wrote:

> HDFS supports POSIX style file and directory permissions (read, write,
> execute) for the owner, group and world. You can change the permissions
> with hadoop fs -chmod <permissions> <path>
>
> -Joey
>
>
> On Feb 22, 2012, at 5:32, <Shreya.Pal@cognizant.com> wrote:
>
> > Hi
> >
> >
> >
> >
> >
> > I want to implement security at file level in Hadoop, essentially
> > restricting certain data to certain users.
> >
> > Ex - File A can be accessed only by a user X
> >
> > File B can be accessed by only user X and user Y
> >
> >
> >
> > Is this possible in Hadoop, how do we do it? At what level are these
> > permissions applied (before copying to HDFS or after putting in HDFS)?
> >
> > When the file gets replicated does it retain these permissions?
> >
> >
> >
> > Thanks
> >
> > Shreya
> >
> >
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