Setting the logging level in Hadoop to WARN

Question

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 replac

Answer 1

To change the log levels dynamically, so that restart of the daemon is not required use hadoop daemonlog utility.

    hadoop daemonlog -setlevel hostname:port className logLevel

For example to change the log level of datanode logs to WARN.

    hadoop daemonlog -setlevel hostname:50075 org.apache.hadoop.hdfs.server.datanode.DataNode WARN