在Java中使用JMX读取Cassandra矩阵 [英] Read cassandra matrics using JMX in Java

问题描述

如何使用JMX / Metrics在Java中生成Cassandra的实时指标？我想运行cassandra JMX命令来收集cassandra矩阵。示例将不胜感激。

How can i produce live metrics of Cassandra in Java using JMX/Metrics? I want to run cassandra JMX command to collect cassandra matrices.Examples will be much appreciated.

推荐答案

所有通过JMX公开的Cassandra指标<官方文档中记录了href = http://cassandra.apache.org/doc/latest/operating/metrics.html rel = nofollow noreferrer> 。并且由于它使用了Metrics库，因此您可能不需要使用JMX来捕获指标-有关更多信息（和 conf / metrics-reporter-config-sample，请参阅参考页末尾的注释。 yaml （来自Cassandra发行版的示例文件）。

All Cassandra's metrics exposed via JMX are documented in official documentation. And because it uses the Metrics library, you may not need to use JMX to capture metrics - see the note at the end of the referenced page for more information (and conf/metrics-reporter-config-sample.yaml example file from Cassandra's distribution).

PS也许我误解了这个问题-您能提供更多详细信息吗？您是否正在寻找从Cassandra收集指标的命令？还是Java中的代码段？

P.S. Maybe I misunderstood the question - can you provide more details? Are you looking for commands to collect that metrics from Cassandra? Or code snippets in Java?

从Java中，您可以通过以下方式访问特定指标：

From Java you can access the particular metrics with something like this:

JMXServiceURL url = new JMXServiceURL(
    "service:jmx:rmi:///jndi/rmi://[127.0.0.1]:7199/jmxrmi");
JMXConnector jmxc = JMXConnectorFactory.connect(url, null);
MBeanServerConnection mbsc = jmxc.getMBeanServerConnection();

Set<ObjectInstance> objs = mbsc.queryMBeans(ObjectName
                                        .getInstance("org.apache.cassandra.metrics:type=ClientRequest,scope=Read-ALL,name=TotalLatency"), null);
for (ObjectInstance obj : objs) {
    Object proxy = JMX.newMBeanProxy(mbsc, obj.getObjectName(),
       CassandraMetricsRegistry.JmxCounterMBean.class);
    if (proxy instanceof CassandraMetricsRegistry.JmxCounterMBean) {
        System.out.println("TotalLatency = " + ((CassandraMetricsRegistry.JmxCounterMBean) proxy).getCount());
    }
}
jmxc.close();

更详细的示例可以在 JmxCollector 。

More detailed example you can find at JmxCollector from cassandra-metrics-collector project...

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