8. Monitoring
As the old systems adage goes, a service doesn’t exist unless it’s monitored. In this chapter, we will cover the basics of monitoring Cassandra. These include file-based logging, inspection of the JVM, and monitoring of Cassandra itself.
Logging
Under the covers, Cassandra uses the standard Java log library Log4j. Log4j is another Apache project that enables the capability to control the granularity of log statements using a configuration file. If you want to find out more about what is happening on a particular node than what nodetool and JMX MBeans (which we will cover in more detail later in the chapter) are telling you, you can change the logging levels.
As a front end to the Log4j back end, Cassandra uses Simple Logging Façade ...
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