How do I setup dropwizard metrics for the Cassandra java driver? - cassandra

Question

I would like to set up the java driver to collect JMX metrics using jConsole or jmxterm. How do I go about exposing those mbean metrics in the Cassandra java driver? In this case, I'm using the 4.14 java driver.

Answer 1

Here's a good link that helped me with the 4.14 driver:
https://docs.datastax.com/en/developer/java-driver/4.14/manual/core/metrics/
Ultimately, the JMX metrics look like the following in jConsole:
And here's my application code:
pom.xml:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example.cassandra</groupId>
<artifactId>testing-connection</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>testing-connection</name>
<properties>
<java.version>1.8</java.version>
<driver.version>4.14.1</driver.version>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>com.datastax.oss</groupId>
<artifactId>java-driver-core</artifactId>
<version>${driver.version}</version>
</dependency>
<dependency>
<groupId>io.dropwizard.metrics</groupId>
<artifactId>metrics-jmx</artifactId>
<version>4.1.2</version>
</dependency>
</dependencies>
</project>
application.conf:
datastax-java-driver
{
basic {
contact-points = [ "10.101.36.152:9042" ]
load-balancing-policy {
local-datacenter = "SearchGraphAnalytics"
}
}
advanced.metrics {
session.enabled = [ bytes-sent,bytes-received,connected-nodes,cql-requests,cql-client-timeouts,cql-prepared-cache-size,throttling.delay,throttling.queue-size,throttling.errors,continuous-cql-requests,graph-requests,graph-client-timeouts ]
node.enabled = [ pool.open-connections,pool.available-streams,pool.in-flight,pool.orphaned-streams,bytes-sent,bytes-received,cql-messages,errors.request.unsent,errors.request.aborted,errors.request.write-timeouts,errors.request.read-timeouts,errors.request.unavailables,errors.request.others,retries.total,retries.aborted,retries.read-timeout,retries.write-timeout,retries.unavailable,retries.other,ignores.total,ignores.aborted,ignores.read-timeout,ignores.write-timeout,ignores.unavailable,ignores.other,speculative-executions,errors.connection.init,errors.connection.auth,graph-messages ]
}
}
Main class
package com.example.cassandra;
import com.datastax.oss.driver.api.core.CqlSession;
import com.datastax.oss.driver.api.core.CqlSessionBuilder;
import com.datastax.oss.driver.api.core.metadata.Metadata;
import com.datastax.oss.driver.api.core.cql.ResultSet;
import java.util.ArrayList;
import com.codahale.metrics.jmx.JmxReporter;
import com.codahale.metrics.MetricRegistry;
public class TestingConnections {
private CqlSession session;
static String keyspace = "keyspace1";
static String table = "names";
public void connect() {
CqlSessionBuilder builder = CqlSession.builder();
session = builder.build();
Metadata metadata = session.getMetadata();
System.out.printf("Connected to cluster: %s\n", metadata.getClusterName());
}
public CqlSession getSession() {
return this.session;
}
public void getData(String keyspace, String table) {
ResultSet results = session.execute("select * from " + keyspace + "." + table);
ArrayList<String> first_names = new ArrayList<String>();
results.forEach(row -> first_names.add(row.getString("first")));
first_names.forEach(first_name -> System.out.println(first_name));
}
public void close() {
session.close();
}
public void registerJMX() {
MetricRegistry registry = session.getMetrics()
.orElseThrow(() -> new IllegalStateException("Metrics are disabled"))
.getRegistry();
JmxReporter reporter =
JmxReporter.forRegistry(registry)
.inDomain("com.datastax.oss.driver")
.build();
reporter.start();
}
public static void main(String[] args) {
System.out.printf("Connecting to client");
TestingConnections client = new TestingConnections();
client.connect();
client.registerJMX();
client.getData(keyspace, table);
}
}
That did work to generate the metrics as shown in the first screenshot. I haven't tried with metric packages other than the dropwizard (which is the default).
Also note, I am not calling client.close() because I want my session to stay open so that I can connect jConsole to my java application.