Cassandra is an open source distributed database management system. We use the Jolokia agent to monitor Cassandra’s performance as Cassandra exposes its metrics via JMX. Jolokia connects to a given mbean server and then exposes the server via a REST-like interface, acting as a bridge between JMX and HTTP/JSON. Configuration Download the Jolokia JVM JAR file. Move the downloaded file to the /opt/netuitive-agent/ directory. Add the following line to the very end of the cassandra-env.