title: Setting the logging level in Hadoop to WARN
body: <p>I've tried numerous ways of setting the logging level in Hadoop to WARN, but have failed each time.
  Firstly, I tried to configure the log4j.properties file by simply replacing "INFO" with "WARN" everywhere. No result.</p>
  
  <p>Next, I tried to give Hadoop UNIX commands (in accordance with <a href="http://hadoop.apache.org/common/docs/current/commands_manual.html#daemonlog">http://hadoop.apache.org/common/docs/current/commands_manual.html#daemonlog</a>):</p>
  
  <p>$ hadoop daemonlog -setlevel   </p>
  
  <p>Is it possible that one actually has to alter the SOURCE CODE to make it work? Logging is often quite simple to control, in most cases a slight adjustment of the logging properties usually does it... </p>