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From Razen Alharbi <razen.alha...@yahoo.com>
Subject Re: I need help
Date Thu, 30 Apr 2009 02:40:41 GMT

Thanks everybody,

The issue was that hadoop writes all the outputs to stderr instead of stdout
and i don't know why. I would really love to know why the usual hadoop job
progress is written to stderr.

Thanks again.

Razen


Razen Alharbi wrote:
> 
> Hi all,
> 
> I am writing an application in which I create a forked process to execute
> a specific Map/Reduce job. The problem is that when I try to read the
> output stream of the forked process I get nothing and when I execute the
> same job manually it starts printing the output I am expecting. For
> clarification I will go through the simple code snippet:
> 
> 
> Process p = rt.exec("hadoop jar GraphClean args");
> BufferedReader reader = new BufferedReader(new
> InputStreamReader(p.getInputStream()));
> String line = null;
> check = true;
> while(check){
>     line = reader.readLine();
>     if(line != null){// I know this will not finish it's only for testing.
>         System.out.println(line);
>     } 
> }
> 
> If I run this code nothing shows up. But if execute the command (hadoop
> jar GraphClean args) from the command line it works fine. I am using
> hadoop 0.19.0.
> 
> Thanks,
> 
> Razen
> 
> 
> 
> 

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