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List: hadoop-user
Subject: RE: where to find the log info
From: Devaraj K <devaraj.k () huawei ! com>
Date: 2011-07-28 7:14:04
Message-ID: A2836D852A11482C83DD715FE95E976F () china ! huawei ! com
[Download RAW message or body]
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_wu@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);
}
}
}
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