[root@db apache-cassandra]# vim conf/log4j.properties log4j.appender.R=org.apache.log4j.RollingFileAppender log4j.appender.file.maxFileSize=20MB log4j.appender.file.maxBackupIndex=50 log4j.appender.R.layout=org.apache.log4j.PatternLayout log4j.appender.R.layout.ConversionPattern=%5p [%t] %d{ISO8601} %F (line %L) %m%n # Edit the next line to point to your logs directory log4j.appender.R.File=/var/log/cassandra/system.log # Application logging options #log4j.logger.com.facebook=DEBUG #log4j.logger.com.facebook.infrastructure.gms=DEBUG #log4j.logger.com.facebook.infrastructure.db=DEBUG