Cassandra prometheus exporter
This is a prometheus exporter for cassandra. It works by exporting dropwizard metrics from the cassandra core in the prometheus format. It's much more performant both in terms of memory and cpu resources than the prometheus jmx exporter.
Building
build the jar file
mvn package
How To
Copy the cassandra-prometheus-2.0.0-jar-with-dependencies.jar
to the deployment and run the cassandra instance with an extra
-javaagent argument. e.g to have metrics at http://127.0.0.1:7400/metrics:
echo 'JVM_OPTS="$JVM_OPTS -javaagent:/usr/share/cassandra/lib/cassandra-prometheus-2.0.0-jar-with-dependencies.jar=7400"' >> /etc/cassandra/cassandra-env.sh
To use a different path than /metrics, e.g /prometheus:
-javaagent:/usr/share/cassandra/lib/cassandra-prometheus-2.0.0-jar-with-dependencies.jar=7400:prometheus"
Running the integration test
cd integrationtest
cp ../target/cassandra-prometheus-2.0.0-jar-with-dependencies.jar cassandra/
docker-compose pull
docker-compose build
docker-compose up -d
Open a browser to the address 127.0.0.1:9090 and see that cassandra gets scraped.