2.2. Enabling Logging

To enable logging, change the settings in the hadoop-env.cmd file. After modifying hadoop-env.cmd, recreate the NameNode service XML and then restart the NameNode.

To enable audit logging, change the hdfs.audit.logger value to INFO,RFAAUDIT. Overwrite the NameNode service XML and restart the NameNode.

Open the Hadoop Environment script, %HADOOP_HOME%\etc\hadoop\hadoop- env.cmd.

Prepend the following text in the HADOOP_NAMENODE_OPTS definition, for example to enable Garbage Collection logging:

-Xloggc:%HADOOP_LOG_DIR%/gc-namenode.log -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintGCDateStamps

For example:

set HADOOP_NAMENODE_OPTS=-Xloggc:%HADOOP_LOG_DIR%/gc-namenode.log 
-verbose:gc 
-XX:+PrintGCDetails 
-XX:+PrintGCTimeStamps 
-XX:+PrintGCDateStamps 
-Dhadoop.security.logger=%HADOOP_SECURITY_LOGGER% 
-Dhdfs.audit.logger=%HDFS_AUDIT_LOGGER% %HADOOP_NAMENODE_OPTS%

Run the following command to recreate the NameNode service XML:
%HADOOP_HOME%\bin\hdfs --service namenode > %HADOOP_HOME%\bin\namenode.xml
Verify that the NameNode Service XML was updated.
Restart the NameNode service.

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