FAQ
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: 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);
}
}
}

Search Discussions

Discussion Posts

Previous

Related Discussions

Discussion Navigation
viewthread | post
posts ‹ prev | 3 of 3 | next ›
Discussion Overview
groupcommon-user @
categorieshadoop
postedJul 28, '11 at 6:17a
activeJul 28, '11 at 7:05a
posts3
users3
websitehadoop.apache.org...
irc#hadoop

3 users in discussion

Devaraj K: 1 post Harsh J: 1 post Daniel,Wu: 1 post

People

Translate

site design / logo © 2022 Grokbase