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From: Tarandeep Singh <tarandeep@gmail.com>
Date: Sun, 17 Jan 2010 18:19:31 -0800
Message-ID: <e75c02ef1001171819q79d35b6bh82df7f2a7b8fdb8@mail.gmail.com>
Subject: Re: Hadoop and X11 related error
To: common-user@hadoop.apache.org
Cc: hadoop-user@lucene.apache.org
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On Sun, Jan 17, 2010 at 1:57 PM, Vladimir Klimontovich <
klimontovich@gmail.com> wrote:

> Maybe, hadoop running MR jobs using different user? For example, if you
> followed installation instructions
> from official site or used rpm/deb packages hadoop using "hadoop" user to
> run jobs. And you probably using different user
> for running your test program.
>
>
Thanks Vladimir..
I am not running hadoop as the "hadoop" user. Both my test program and
hadoop are run using same user.
>From the exception, it is clear the DISPLAY variable is set properly, but
java is not able to connect to the X server (not sure either some permission
issues or what)


> On Jan 18, 2010, at 12:41 AM, Tarandeep Singh wrote:
>
> > Hi,
> >
> > I am running a MR job that requires usage of some java.awt.* classes,
> that
> > can't be run in headless mode.
> >
> > Right now, I am running Hadoop in a single node cluster (my laptop) which
> > has X11 server running. I have set up my ssh server and client to do X11
> > forwarding.
> >
> > I ran the following java program to ensure that X11 forwarding is
> working-
> >
> > public class Test
> >  throws Exception
> > {
> >  public static void main( String[] args)
> >  {
> >    Process p = runtime.getRuntime( ).exec( "/usr/bin/xterm");
> >    p.waitFor( );
> >  }
> > }
> >
> > I ran it as-
> > ssh localhost "java Test"
> > and it worked confirming that X11 forwarding is working over SSH.
> >
> > However, when I run a Map Reduce program that uses java.awt.* classes
> > (trying to create an object that extends Frame), I keep getting this
> error-
> >
> > java.lang.InternalError- Can't connect to X11 window server using
> > 'localhost:10.0' as the value of the DISPLAY variable
> >
> > I printed the value of DISPLAY variable-
> >
> > echo $DISPLAY
> > :0.0
> > ssh localhost
> > echo $DISPLAY
> > localhost:10.0
> >
> > I understand this is more of a SSH and X11 related issue, but X11
> forwarding
> > is working over SSH in my standalone programs, but not in MR program.
> That's
> > why I am posting the problem here.
> >
> > Any help is greatly appreciated.
> >
> > Thanks,
> > Tarandeep
>
> ---
> Vladimir Klimontovich,
> skype: klimontovich
> GoogleTalk/Jabber: klimontovich@gmail.com
> Cell phone: +7926 890 2349
>
>

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