使用JMX监控Zookeeper状态Java API

一、背景

上一篇通过Java自带的JConsole来获取zookeeper状态。主要有几个不方便的地方，zk集群一般会部署3或者5台，在多个JConsole窗口中切换比较麻烦，各个zk服务及历史数据之间，不能直观比较。一般会做一个WEB管理页面来展示集群状态，设置报警阀值来做报警。

二、JVM平台提供Mbeans

在Java5.0以上版本，有一组API可以让Java应用程序和允许的工具监视和管理Java虚拟机（JVM）和虚拟机所在的本机操作系统。该组API在 java.lang.management包。可以通过这些API可以监控local端JVM，同时也可以监控远端JVM。

通过静态工厂方法获取MXBean实例，从本地访问正在运行的虚拟机的MXBean接口。这些Bean我们从ManagementFactory类中定义的静态方法获取；如ManagementFactory.getOperatingSystemMXBean();其中不足就是只能获取本地的JVM状态。无法获取远程的虚拟机数据。

ClassLoadingMXBean Java虚拟机的类加载系统
CompilationMXBean Java虚拟机的编译系统
MemoryMXBean Java虚拟机的内存系统
RuntimeMXBean Java虚拟机的运行时系统
OperatingSystemMXBean Java虚拟机在其上运行的操作系统
GarbageCollectorMXBean Java虚拟机中的垃圾回收器
MemoryManagerMXBean Java虚拟机中的内存管理器
MemoryPoolMXBean Java虚拟机中的内存池

三、Zookeeper提供出来的Mbeans

构造MXBean代理实例，通过代理将方法调用转发到给定的MBeanServe。JConsole能够监控的项目，通过API都能获取到。

具体代码如下：

import java.io.IOException;
import java.lang.management.ClassLoadingMXBean;
import java.lang.management.CompilationMXBean;
import java.lang.management.ManagementFactory;
import java.lang.management.OperatingSystemMXBean;
import java.lang.management.ThreadMXBean;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.management.InstanceNotFoundException;
import javax.management.IntrospectionException;
import javax.management.JMX;
import javax.management.MBeanServerConnection;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;
import javax.management.ReflectionException;
import javax.management.remote.JMXConnector;
import javax.management.remote.JMXConnectorFactory;
import javax.management.remote.JMXServiceURL;
import org.apache.zookeeper.server.ConnectionMXBean;
import org.apache.zookeeper.server.DataTreeMXBean;
import org.apache.zookeeper.server.ZooKeeperServerMXBean;
public class ZkJMXTest {
  static JMXConnector connector;
  /**
   * @param args
   * @throws IOException
   * @throws MalformedObjectNameException
   * @throws InstanceNotFoundException
   * @throws ReflectionException
   * @throws IntrospectionException
   */
  public static void main(String[] args) throws IOException, MalformedObjectNameException,
    InstanceNotFoundException, IntrospectionException, ReflectionException {
    OperatingSystemMXBean osbean = ManagementFactory.getOperatingSystemMXBean();
    System.out.println("体系结构:" + osbean.getArch());//操作系统体系结构
    System.out.println("处理器核数:" + osbean.getAvailableProcessors());///核数
    System.out.println("名字:" + osbean.getName());//名字
    System.out.println(osbean.getVersion());//操作系统版本
    ThreadMXBean threadBean=ManagementFactory.getThreadMXBean();
    System.out.println("活动线程:" + threadBean.getThreadCount());//总线程数
    ClassLoadingMXBean classLoadingMXBean = ManagementFactory.getClassLoadingMXBean();
    CompilationMXBean compilationMXBean = ManagementFactory.getCompilationMXBean();
    System.out.println("===========");
    // 通过 MBeanServer间接地访问 MXBean 接口
    MBeanServerConnection mbsc = createMBeanServer("192.168.1.100", "9991", "controlRole", "123456");
    // 操作系统
    ObjectName os = new ObjectName("java.lang:type=OperatingSystem");
    System.out.println("体系结构:" + getAttribute(mbsc, os, "Arch"));//体系结构
    System.out.println("处理器核数:" + getAttribute(mbsc, os, "AvailableProcessors"));//核数
    System.out.println("总物理内存:" + getAttribute(mbsc, os, "TotalPhysicalMemorySize"));//总物理内存
    System.out.println("空闲物理内存:" + getAttribute(mbsc, os, "FreePhysicalMemorySize"));//空闲物理内存
    System.out.println("总交换空间:" + getAttribute(mbsc, os, "TotalSwapSpaceSize"));//总交换空间
    System.out.println("空闲交换空间:" + getAttribute(mbsc, os, "FreeSwapSpaceSize"));//空闲交换空间
    System.out.println("操作系统:" + getAttribute(mbsc, os, "Name")+ getAttribute(mbsc, os, "Version"));//操作系统
    System.out.println("提交的虚拟内存:" + getAttribute(mbsc, os, "CommittedVirtualMemorySize"));//提交的虚拟内存
    System.out.println("系统cpu使用率:" + getAttribute(mbsc, os, "SystemCpuLoad"));//系统cpu使用率
    System.out.println("进程cpu使用率:" + getAttribute(mbsc, os, "ProcessCpuLoad"));//进程cpu使用率
    System.out.println("============");//
    // 线程
    ObjectName Threading = new ObjectName("java.lang:type=Threading");
    System.out.println("活动线程:" + getAttribute(mbsc, Threading, "ThreadCount"));// 活动线程
    System.out.println("守护程序线程:" + getAttribute(mbsc, Threading, "DaemonThreadCount"));// 守护程序线程
    System.out.println("峰值:" + getAttribute(mbsc, Threading, "PeakThreadCount"));// 峰值
    System.out.println("启动的线程总数:" + getAttribute(mbsc, Threading, "TotalStartedThreadCount"));// 启动的线程总数
    ThreadMXBean threadBean2 = ManagementFactory.newPlatformMXBeanProxy
        (mbsc, ManagementFactory.THREAD_MXBEAN_NAME, ThreadMXBean.class);
    System.out.println("活动线程:" + threadBean2.getThreadCount());// 活动线程
    ThreadMXBean threadBean3 = ManagementFactory.getThreadMXBean();
    System.out.println("本地活动线程:" + threadBean3.getThreadCount());// 本地活动线程
    System.out.println("============");//
    ObjectName Compilation = new ObjectName("java.lang:type=Compilation");
    System.out.println("总编译时间 毫秒:" + getAttribute(mbsc, Compilation, "TotalCompilationTime"));// 总编译时间 毫秒
    System.out.println("============");//
    ObjectName ClassLoading = new ObjectName("java.lang:type=ClassLoading");
    System.out.println("已加载类总数:" + getAttribute(mbsc, ClassLoading, "TotalLoadedClassCount"));// 已加载类总数
    System.out.println("已加装当前类:" + getAttribute(mbsc, ClassLoading, "LoadedClassCount"));// 已加装当前类
    System.out.println("已卸载类总数:" + getAttribute(mbsc, ClassLoading, "UnloadedClassCount"));// 已卸载类总数
    System.out.println("==========================================================");//
    // http://zookeeper.apache.org/doc/r3.4.6/zookeeperJMX.html
    // org.apache.ZooKeeperService:name0=ReplicatedServer_id1,name1=replica.1,name2=Follower
    ObjectName replica = new ObjectName("org.apache.ZooKeeperService:name0=ReplicatedServer_id1,name1=replica.1");
    System.out.println("replica.1运行状态:" + getAttribute(mbsc, replica, "State"));// 运行状态
    mbsc = createMBeanServer("192.168.1.100", "9992", "controlRole", "123456");
    System.out.println("==============节点树对象===========");
    ObjectName dataTreePattern = new ObjectName("org.apache.ZooKeeperService:name0=ReplicatedServer_id?,name1=replica.?,name2=*,name3=InMemoryDataTree");
    Set<ObjectName> dataTreeSets = mbsc.queryNames(dataTreePattern, null);
    Iterator<ObjectName> dataTreeIterator = dataTreeSets.iterator();
    // 只有一个
    while (dataTreeIterator.hasNext()) {
      ObjectName dataTreeObjectName = dataTreeIterator.next();
      DataTreeMXBean dataTree = JMX.newMBeanProxy(mbsc, dataTreeObjectName, DataTreeMXBean.class);
      System.out.println("节点总数:" + dataTree.getNodeCount());// 节点总数
      System.out.println("Watch总数:" + dataTree.getWatchCount());// Watch总数
      System.out.println("临时节点总数:" + dataTree.countEphemerals());// Watch总数
      System.out.println("节点名及字符总数:" + dataTree.approximateDataSize());// 节点全路径和值的总字符数
      Map<String, String> dataTreeMap = dataTreeObjectName.getKeyPropertyList();
      String replicaId = dataTreeMap.get("name1").replace("replica.", "");
      String role = dataTreeMap.get("name2");// Follower,Leader,Observer,Standalone
      String canonicalName = dataTreeObjectName.getCanonicalName();
      int roleEndIndex = canonicalName.indexOf(",name3");
      ObjectName roleObjectName = new ObjectName(canonicalName.substring(0, roleEndIndex));
      System.out.println("==============zk服务状态===========");
      ZooKeeperServerMXBean ZooKeeperServer = JMX.newMBeanProxy(mbsc, roleObjectName, ZooKeeperServerMXBean.class);
      System.out.println(role + " 的IP和端口:" + ZooKeeperServer.getClientPort());// IP和端口
      System.out.println(role + " 活着的连接数:" + ZooKeeperServer.getNumAliveConnections());// 连接数
      System.out.println(role + " 未完成请求数:" + ZooKeeperServer.getOutstandingRequests());// 未完成的请求数
      System.out.println(role + " 接收的包:" + ZooKeeperServer.getPacketsReceived());// 收到的包
      System.out.println(role + " 发送的包:" + ZooKeeperServer.getPacketsSent());// 发送的包
      System.out.println(role + " 平均延迟（毫秒）:" + ZooKeeperServer.getAvgRequestLatency());
      System.out.println(role + " 最大延迟（毫秒）:" + ZooKeeperServer.getMaxRequestLatency());
      System.out.println(role + " 每个客户端IP允许的最大连接数:" + ZooKeeperServer.getMaxClientCnxnsPerHost());
      System.out.println(role + " 最大Session超时（毫秒）:" + ZooKeeperServer.getMaxSessionTimeout());
      System.out.println(role + " 心跳时间（毫秒）:" + ZooKeeperServer.getTickTime());
      System.out.println(role + " 版本:" + ZooKeeperServer.getVersion());// 版本
      // 三个重置操作
//      ZooKeeperServer.resetLatency(); //重置min/avg/max latency statistics
//      ZooKeeperServer.resetMaxLatency(); //重置最大延迟统计
//      ZooKeeperServer.resetStatistics(); // 重置包和延迟所有统计
      System.out.println("==============所有客户端的连接信息===========");
      ObjectName connectionPattern = new ObjectName("org.apache.ZooKeeperService:name0=ReplicatedServer_id?,name1=replica.?,name2=*,name3=Connections,*");
      Set<ObjectName> connectionSets = mbsc.queryNames(connectionPattern, null);
      List<ObjectName> connectionList = new ArrayList<ObjectName>(connectionSets.size());
      connectionList.addAll(connectionSets);
      Collections.sort(connectionList);
      for (ObjectName connectionON : connectionList) {
        System.out.println("=========================");
        ConnectionMXBean connectionBean = JMX.newMBeanProxy(mbsc, connectionON, ConnectionMXBean.class);
        System.out.println(" IP+Port:" + connectionBean.getSourceIP());//
        System.out.println(" SessionId:" + connectionBean.getSessionId());//
        System.out.println(" PacketsReceived:" + connectionBean.getPacketsReceived());// 收到的包
        System.out.println(" PacketsSent:" + connectionBean.getPacketsSent());// 发送的包
        System.out.println(" MinLatency:" + connectionBean.getMinLatency());//
        System.out.println(" AvgLatency:" + connectionBean.getAvgLatency());//
        System.out.println(" MaxLatency:" + connectionBean.getMaxLatency());//
        System.out.println(" StartedTime:" + connectionBean.getStartedTime());//
        System.out.println(" EphemeralNodes:" + connectionBean.getEphemeralNodes().length);//
        System.out.println(" EphemeralNodes:" + Arrays.asList(connectionBean.getEphemeralNodes()));//
        System.out.println(" OutstandingRequests:" + connectionBean.getOutstandingRequests());//
        //connectionBean.resetCounters();
        //connectionBean.terminateConnection();
        //connectionBean.terminateSession();
      }
    }
    // close connection
    if (connector != null) {
      connector.close();
    }
  }
  /**
   * 建立连接
   * @param ip
   * @param jmxport
   * @return
   */
  public static MBeanServerConnection createMBeanServer(String ip,
      String jmxport, String userName, String password) {
    try {
      String jmxURL = "service:jmx:rmi:///jndi/rmi://" + ip + ":"
          + jmxport + "/jmxrmi";
      // jmxurl
      JMXServiceURL serviceURL = new JMXServiceURL(jmxURL);
      Map<String, String[]> map = new HashMap<String, String[]>();
      String[] credentials = new String[] { userName, password };
      map.put("jmx.remote.credentials", credentials);
      connector = JMXConnectorFactory.connect(serviceURL, map);
      MBeanServerConnection mbsc = connector.getMBeanServerConnection();
      return mbsc;
    } catch (IOException ioe) {
      ioe.printStackTrace();
      System.err.println(ip + ":" + jmxport + " 连接建立失败");
    }
    return null;
  }
  /**
   * 使用MBeanServer获取对象名为[objName]的MBean的[objAttr]属性值
   * <p>
   * 静态代码: return MBeanServer.getAttribute(ObjectName name, String attribute)
   * @param mbeanServer
   *      - MBeanServer实例
   * @param objName
   *      - MBean的对象名
   * @param objAttr
   *      - MBean的某个属性名
   * @return 属性值
   */
  private static String getAttribute(MBeanServerConnection mbeanServer,
      ObjectName objName, String objAttr) {
    if (mbeanServer == null || objName == null || objAttr == null)
      throw new IllegalArgumentException();
    try {
      return String.valueOf(mbeanServer.getAttribute(objName, objAttr));
    } catch (Exception e) {
      return null;
    }
  }
}

总结

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