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From Amandeep Khurana <ama...@gmail.com>
Subject Re: Doubt regarding permissions
Date Mon, 13 Apr 2009 18:10:49 GMT
Amar, just in case the term "superuser" isnt clear, in this context it means
the user who started the Hadoop daemons.


Amandeep Khurana
Computer Science Graduate Student
University of California, Santa Cruz


On Mon, Apr 13, 2009 at 11:03 AM, Tsz Wo (Nicholas), Sze <
s29752-hadoopuser@yahoo.com> wrote:

>
> Hi Amar,
>
> I just have tried.  Everything worked as expected.  I guess user A in your
> experiment was a superuser so that he could read anything.
>
> Nicholas Sze
>
> /////// permission testing //////////////////////////////////////////
> drwx-wx-wx   - nicholas supergroup          0 2009-04-13 10:55 /temp
> drwx-w--w-   - tsz supergroup          0 2009-04-13 10:58 /temp/test
> -rw-r--r--   3 tsz supergroup       1366 2009-04-13 10:58 /temp/test/r.txt
>
> //login as nicholas (non-superuser)
>
> $ whoami
> nicholas
>
> $ ./bin/hadoop fs -lsr /temp
> drwx-w--w-   - tsz supergroup          0 2009-04-13 10:58 /temp/test
> lsr: could not get get listing for 'hdfs://xxxx:9000/temp/test' :
> org.apache.hadoop.security.AccessControlException: Permission denied:
> user=nicholas, access=READ_EXECUTE, inode="test":tsz:supergroup:rwx-w--w-
>
> $ ./bin/hadoop fs -cat /temp/test/r.txt
> cat: org.apache.hadoop.security.AccessControlException: Permission denied:
> user=nicholas, access=EXECUTE, inode="test":tsz:supergroup:rwx-w--w-
>
>
>
> ----- Original Message ----
> > From: Amar Kamat <amarrk@yahoo-inc.com>
> > To: core-user@hadoop.apache.org
> > Sent: Monday, April 13, 2009 2:02:24 AM
> > Subject: Doubt regarding permissions
> >
> > Hey, I tried the following :
> >
> > -          created a dir temp for user A and permission 733
> >
> > -          created a dir temp/test for user B and permission 722
> >
> > -          - created a file temp/test/test.txt for user B and
> permission722
> >
> >
> >
> > Now in HDFS, user A can list as well as read the contents of file
> > temp/test/test.txt while on my RHEL box I cant. Is it a feature or a
> > bug. Can someone please try this out and confirm?
> >
> >
> >
> > Thanks
> >
> > Amar
>
>

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