On Sun, Jan 17, 2010 at 9:46 PM, Todd Lipcon <t...@cloudera.com> wrote:
> On Sun, Jan 17, 2010 at 6:19 PM, Tarandeep Singh <tarand...@gmail.com>wrote:
>
>> On Sun, Jan 17, 2010 at 1:57 PM, Vladimir Klimontovich <
>> klimontov...@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)
>>
>
> My guess is you're either missing the XAUTHORITY variable, or it's pointed
> at a file that the user executing the task can't read.
>
> (as a side note, this seems like a really bad idea - why are your hadoop
> tasks trying to talk to an X11 server in the first place?)
>
> -Todd
>
>
>>
>>
>>
>> > 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: klimontov...@gmail.com
>> > Cell phone: +7926 890 2349
>> >
>> >
>>
>
(as a side note, this seems like a really bad idea - why are your hadoop
tasks trying to talk to an X11 server in the first place?)
If he is using java.awt, that windowing needs an xserver to draw.
going to java.swing with headless might help. I believe the entire
swing API can work in headless mode, but that would involve a re-code.
