|NO.Z.00090|——————————|BigDataEnd|——|Hadoop&kafka.V04|——|kafka.v04|编程手段获取监控指标|

一、编程手段获取监控指标：查看要监控哪个指标

二、监控指标项目准备主题数据

### --- 查看现有的主题

[root@hadoop01 ~]#  kafka-topics.sh --zookeeper localhost:2181/myKafka --describe --topic topic_x
Topic:topic_x   PartitionCount:3    ReplicationFactor:2 Configs:
    Topic: topic_x  Partition: 0    Leader: 0   Replicas: 0,2   Isr: 0,2
    Topic: topic_x  Partition: 1    Leader: 1   Replicas: 1,0   Isr: 1,0
    Topic: topic_x  Partition: 2    Leader: 2   Replicas: 2,1   Isr: 2,1

### --- 向主题里面写入消息

~~~     # 准备10000条消息的数据文件
[root@hadoop01 ~]# for i in `seq 10000000`; do echo "hello yanqi $i" >> msg.txt; done
 
~~~     # 写入数据
[root@hadoop01 ~]# kafka-console-producer.sh --broker-list \
hadoop01:9092,hadoop02:9092 --topic topic_x < msg.txt 

三、创建一个maven项目

### --- 创建一个maven项目：demo-14-kafka-jmx
### --- 导入pom.xml依赖

    <dependencies>
        <dependency>
            <groupId>org.apache.kafka</groupId>
            <artifactId>kafka-clients</artifactId>
            <version>1.0.2</version>
        </dependency>
    </dependencies>

四、编程代码

### --- 代码实现：

package com.yanqi.kafka.demo.monitor;

import javax.management.*;
import javax.management.remote.JMXConnector;
import javax.management.remote.JMXConnectorFactory;
import javax.management.remote.JMXServiceURL;
import java.io.IOException;
import java.util.Iterator;
import java.util.Set;

public class JMXMonitorDemo {

    public static void main(String[] args) throws IOException, MalformedObjectNameException, AttributeNotFoundException, MBeanException, ReflectionException, InstanceNotFoundException {

        String jmxServiceURL = "service:jmx:rmi:///jndi/rmi://192.168.1.111:9581/jmxrmi";

        JMXServiceURL jmxURL = null;
        JMXConnector jmxc = null;
        MBeanServerConnection jmxs = null;
        ObjectName mbeanObjName = null;
        Iterator sampleIter = null;
        Set sampleSet = null;

        // 创建JMXServiceURL对象，参数是
        jmxURL = new JMXServiceURL(jmxServiceURL);
        // 建立到指定URL服务器的连接
        jmxc = JMXConnectorFactory.connect(jmxURL);
        // 返回代表远程MBean服务器的MBeanServerConnection对象
        jmxs = jmxc.getMBeanServerConnection();
        // 根据传入的字符串，创建ObjectName对象
//        mbeanObjName = new ObjectName("kafka.server:type=BrokerTopicMetrics,name=MessagesInPerSec");
//        mbeanObjName = new ObjectName("kafka.server:type=BrokerTopicMetrics,name=BytesInPerSec,topic=tp_eagle_01");
        mbeanObjName = new ObjectName("kafka.server:type=BrokerTopicMetrics,name=BytesInPerSec");
        // 获取指定ObjectName对应的MBeans
        sampleSet = jmxs.queryMBeans(null, mbeanObjName);
        // 迭代器
        sampleIter = sampleSet.iterator();

        if (sampleSet.isEmpty()) {

        } else {
            // 如果返回了，则打印信息
            while (sampleIter.hasNext()) {
                // Used to represent the object name of an MBean and its class name.
                // If the MBean is a Dynamic MBean the class name should be retrieved from the MBeanInfo it provides.
                // 用于表示MBean的ObjectName和ClassName
                ObjectInstance sampleObj = (ObjectInstance) sampleIter.next();
                ObjectName objectName = sampleObj.getObjectName();
                // 查看指定MBean指定属性的值
                String count = jmxs.getAttribute(objectName, "Count").toString();
                System.out.println(count);
            }
        }

        // 关闭
        jmxc.close();
    }

}

五、编译打印

### --- 编译打印

D:\JAVA\jdk1.8.0_231\bin\java.exe "-javaagent:D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\lib\idea_rt.jar=52322:D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\bin" -Dfile.encoding=UTF-8 -classpath D:\JAVA\jdk1.8.0_231\jre\lib\charsets.jar;D:\JAVA\jdk1.8.0_231\jre\lib\deploy.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\access-bridge-64.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\cldrdata.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\dnsns.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\jaccess.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\jfxrt.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\localedata.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\nashorn.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\sunec.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\sunjce_provider.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\sunmscapi.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\sunpkcs11.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\zipfs.jar;D:\JAVA\jdk1.8.0_231\jre\lib\javaws.jar;D:\JAVA\jdk1.8.0_231\jre\lib\jce.jar;D:\JAVA\jdk1.8.0_231\jre\lib\jfr.jar;D:\JAVA\jdk1.8.0_231\jre\lib\jfxswt.jar;D:\JAVA\jdk1.8.0_231\jre\lib\jsse.jar;D:\JAVA\jdk1.8.0_231\jre\lib\management-agent.jar;D:\JAVA\jdk1.8.0_231\jre\lib\plugin.jar;D:\JAVA\jdk1.8.0_231\jre\lib\resources.jar;D:\JAVA\jdk1.8.0_231\jre\lib\rt.jar;E:\NO.Z.10000——javaproject\NO.Z.00002.Hadoop\kafka_demo\demo-14-kafka-jmx\target\classes;C:\Users\Administrator\.m2\repository\org\apache\kafka\kafka-clients\1.0.2\kafka-clients-1.0.2.jar;C:\Users\Administrator\.m2\repository\org\lz4\lz4-java\1.4\lz4-java-1.4.jar;C:\Users\Administrator\.m2\repository\org\xerial\snappy\snappy-java\1.1.4\snappy-java-1.1.4.jar;C:\Users\Administrator\.m2\repository\org\slf4j\slf4j-api\1.7.25\slf4j-api-1.7.25.jar com.yanqi.kafka.demo.monitor.JMXMonitorDemo
89738656

Process finished with exit code 0

### --- 验证JMS监控到的值是否一致

~~~     值一致，说明监控到的值和JMS监控到的值是一致的，监控到数据

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Walter Savage Landor:strove with none,for none was worth my strife.Nature I loved and, next to Nature, Art:I warm'd both hands before the fire of life.It sinks, and I am ready to depart

                                                                                                                                                   ——W.S.Landor

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