Re: where to find the log info

[Harsh J]

Task logs are written to userlogs directory on the TT nodes. You can
view task logs on the JobTracker/TaskTracker web UI for each task at:

http://machine:50030/taskdetails.jsp?jobid=&tipid=

All of syslogs, stdout and stderr logs are available in the links to
logs off that page.

2011/7/28 Daniel,Wu :
> Hi everyone,
>
> I am new to it, and want to do some debug/log. I'd like to check what the 
> value is for each mapper execution. If I add the following code in bold, 
> where can I find the log info? If I can't do it in this way, how should I do?
>
>     public void map(Object key, Text value, Context context
>                    ) throws IOException, InterruptedException {
>      StringTokenizer itr = new StringTokenizer(value.toString());
>      System.out.println(value.toString);
>      while (itr.hasMoreTokens()) {
>        word.set(itr.nextToken());
>        context.write(word, one);
>      }
>    }
>  }



-- 
Harsh J

RE: where to find the log info

[Devaraj K]

Daniel, You can find those std out statements in  "{LOG
Directory}/userlogs/{task attemp id}/stdout" file.

Same way you can find std err statements in "{LOG Directory}/userlogs/{task
attemp id}/stderr" and log statements in "{LOG Directory}/userlogs/{task
attemp id}/syslog".

Devaraj K 

-Original Message-
From: Daniel,Wu [mailto:hadoop...@163.com] 
Sent: Thursday, July 28, 2011 11:47 AM
To: common-user@hadoop.apache.org
Subject: where to find the log info

Hi everyone,

I am new to it, and want to do some debug/log. I'd like to check what the
value is for each mapper execution. If I add the following code in bold,
where can I find the log info? If I can't do it in this way, how should I
do?

 public void map(Object key, Text value, Context context
) throws IOException, InterruptedException {
  StringTokenizer itr = new StringTokenizer(value.toString());
  System.out.println(value.toString);
  while (itr.hasMoreTokens()) {
word.set(itr.nextToken());
context.write(word, one);
  }
}
  }