[Hadoop-common-user] where to find the log info

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=<JOBID>&tipid=<TASKID>

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

2011/7/28 Daniel,Wu <[email protected]>:

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
Sent: Thursday, July 28, 2011 11:47 AM
To: [email protected]
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);
}
}
}