Also i would suggest you to look at TestDFSPermission & TestDFSShell test cases for dfs permissions. Which will help you for writing your unit tests.
Thanks Uma ----- Original Message ----- From: Joey Echeverria <[email protected]> Date: Friday, November 4, 2011 4:02 am Subject: Re: Question about superuser and permissions To: [email protected] > When you get the handle to the FileSystem object you can connect as a > different user: > > http://hadoop.apache.org/common/docs/r0.20.203.0/api/org/apache/hadoop/fs/FileSystem.html#get(java.net.URI, > org.apache.hadoop.conf.Configuration, java.lang.String) > > This should get any permissions you set enforced against the > operations using that FileSystem object. > > -Joey > > On Thu, Nov 3, 2011 at 4:01 PM, Frank Astier <fastier@yahoo- > inc.com> wrote: > > Hi - > > > > I’m writing unit tests that programatically start a name node and > populate HDFS directories, but I want to simulate the situation > where I don’t have read access to some HDFS directory (which > happens on the real grid I eventually deploy to). > > > > I’ve tried to chown and chmod, but it seems to have no effect, > and my unit tests happily read the directory I don’t want them to > be able to read. Looking at the permissions documentation, it seems > that because my unit test program started the name node, it is > automatically superuser. I tried setting dfs.permissions.supergroup > to some other user, but that didn’t work either. > > > > Is there any way I could have that unit test think it’s not the > user who started the name node? > > > > Thanks, > > > > Frank > > > > > > -- > Joseph Echeverria > Cloudera, Inc. > 443.305.9434 >
