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Hadoop, mail # user - Specifying user from Hadoop Client?


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Re: Specifying user from Hadoop Client?
Harsh J 2012-07-18, 17:52
Corbett,

Unfortunately I do not know of a way to do that without writing wrapper
code. I do not think it is possible with the secure implementation of
MR/HDFS, regardless of security being turned on/off.

Can your client machine not have a user named as the one that is allowed to
do things on HDFS, if thats how you're architecting your usage? Then users
may do "sudo -u <user>", given sudo grants for that, and create files via
sudo -u user hadoop fs -foo bar commands?

On Wed, Jul 18, 2012 at 11:05 PM, Corbett Martin <[EMAIL PROTECTED]> wrote:

> Thanks for the quick response.
>
> I came across Secure Impersonation earlier today but it didn't seem to do
> what I'm looking for.
>
> Correct me if I'm wrong but Secure Impersonation would require writing
> code to operate on HDFS (mkdir, rm…etc), that code would then need to be
> executed from a client?  I suppose this would do the trick but I was hoping
> we could just issue hadoop fs commands against our cluster directly from a
> remote client yet override the username thats being sent to the cluster.
>
> Thanks
>
> On Jul 18, 2012, at 11:54 AM, Harsh J wrote:
>
> > Hey Corbett,
> >
> > We prevent overriding user.name. We instead provide secure
> > impersonation (does not require kerberos, don't be fooled by its
> > name), which is documented at
> > http://hadoop.apache.org/common/docs/stable/Secure_Impersonation.html.
> > This should let you do what you're attempting to, in a more controlled
> > fashion.
> >
> > On Wed, Jul 18, 2012 at 10:22 PM, Corbett Martin <[EMAIL PROTECTED]>
> wrote:
> >> Hello
> >>
> >> I'm new to Hadoop and I'm trying to do something I *think* should be
> easy but having some trouble.  Here's the details.
> >>
> >> 1. I'm running Hadoop version 1.0.2
> >> 2. I have a 2 Node Hadoop Cluster up and running, with no security
> enabled
> >>
> >> I'm having trouble overriding the username from the client so that the
> files/directories created are owned by the user I specify from the client.
> >>
> >> For example I'm trying to run:
> >>
> >>        hadoop fs -Duser.name=someUserName -conf hadoop-cluster.xml
> -mkdir /user/someOtherUserName/test
> >>
> >> And have the directory "test" created in hdfs and owned by
> "someUserName".  Instead it is creating the directory and giving it the
> owner of the user (whoami) from the client.  I'd like to override or
> control that…can someone tell me how?
> >>
> >> My hadoop-cluster.xml file on the client looks like this:
> >>
> >> <?xml version="1.0"?>
> >> <configuration>
> >>
> >>  <property>
> >>    <name>fs.default.name</name>
> >>    <value>hdfs://server1:54310</value>
> >>  </property>
> >>
> >>  <property>
> >>    <name>mapred.job.tracker</name>
> >>    <value>server1:54311</value>
> >>  </property>
> >>
> >> </configuration>
> >>
> >> Thanks for the help
> >>
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> >
> >
> > --
> > Harsh J
>
>
> This message and its contents (to include attachments) are the property of
> National Health Systems, Inc. and may contain confidential and proprietary
> information. This email and any files transmitted with it are intended
> solely for the use of the individual or entity to whom they are addressed.
> You are hereby notified that any unauthorized disclosure, copying, or

Harsh J