Why not read the output result after job done? And, if you wanted see
the log4j log, you need to set the stdout option to log4jproperties.
On Wed, Apr 29, 2009 at 4:35 AM, Razen Alharbi <razen.alha...@yahoo.com> wrote:
>
> Thanks for the reply,
>
> -Steve:
> I know that I can use the JobClient to run or submit jobs; however, for the
> time being I need to exec the job as a separate process.
>
> -Edward:
> The forked job is not executed from witin a map or reduce so I dont need to
> do data collection.
>
> It seems for some reason the output of the reduce tasks is not written to
> stdout because when I tried to direct the output to a tmp file using the
> following command (hadoop jar GraphClean args > tmp), nothing was written to
> the file and the output still goes to the screen.
>
> Regards,
>
> 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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>
>
--
Best Regards, Edward J. Yoon @ NHN, corp.
edwardy...@apache.org
http://blog.udanax.org
