一、背景
上一篇通過Java自帶的JConsole來獲取zookeeper狀態。主要有幾個不方便的地方，zk集群一般會部署3或者5臺，在多個JConsole窗口中切換比較麻煩，各個zk服務及歷史數據之間，不能直觀比較。一般會做一個WEB管理頁面來展示集群狀態，設置報警閥值來做報警。
二、JVM平臺提供Mbeans
在Java5.0以上版本，有一組API可以讓Java應用程序和允許的工具監視和管理Java虛擬機（JVM）和虛擬機所在的本機操作系統。該組API在 java.lang.management包。可以通過這些API可以監控local端JVM，同時也可以監控遠端JVM。
通過靜態工廠方法獲取MXBean實例，從本地訪問正在運行的虛擬機的MXBean接口。這些Bean我們從ManagementFactory類中定義的靜態方法獲取；如ManagementFactory.getOperatingSystemMXBean();其中不足就是只能獲取本地的JVM狀態。無法獲取遠程的虛擬機數據。
三、Zookeeper提供出來的Mbeans
構造MXBean代理實例，通過代理將方法調用轉發到給定的MBeanServe。JConsole能夠監控的項目，通過API都能獲取到。
具體代碼如下：
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("體系結構:" + osbean.getArch());//操作系統體系結構 System.out.println("處理器核數:" + osbean.getAvailableProcessors());///核數 System.out.println("名字:" + osbean.getName());//名字 System.out.println(osbean.getVersion());//操作系統版本 ThreadMXBean threadBean=ManagementFactory.getThreadMXBean(); System.out.println("活動線程:" + threadBean.getThreadCount());//總線程數 ClassLoadingMXBean classLoadingMXBean = ManagementFactory.getClassLoadingMXBean(); CompilationMXBean compilationMXBean = ManagementFactory.getCompilationMXBean(); System.out.println("==========="); // 通過 MBeanServer間接地訪問 MXBean 接口 MBeanServerConnection mbsc = createMBeanServer("192.168.1.100", "9991", "controlRole", "123456"); // 操作系統 ObjectName os = new ObjectName("java.lang:type=OperatingSystem"); System.out.println("體系結構:" + getAttribute(mbsc, os, "Arch"));//體系結構 System.out.println("處理器核數:" + getAttribute(mbsc, os, "AvailableProcessors"));//核數 System.out.println("總物理內存:" + getAttribute(mbsc, os, "TotalPhysicalMemorySize"));//總物理內存 System.out.println("空閑物理內存:" + getAttribute(mbsc, os, "FreePhysicalMemorySize"));//空閑物理內存 System.out.println("總交換空間:" + getAttribute(mbsc, os, "TotalSwapSpaceSize"));//總交換空間 System.out.println("空閑交換空間:" + getAttribute(mbsc, os, "FreeSwapSpaceSize"));//空閑交換空間 System.out.println("操作系統:" + getAttribute(mbsc, os, "Name")+ getAttribute(mbsc, os, "Version"));//操作系統 System.out.println("提交的虛擬內存:" + getAttribute(mbsc, os, "CommittedVirtualMemorySize"));//提交的虛擬內存 System.out.println("系統cpu使用率:" + getAttribute(mbsc, os, "SystemCpuLoad"));//系統cpu使用率 System.out.println("進程cpu使用率:" + getAttribute(mbsc, os, "ProcessCpuLoad"));//進程cpu使用率 System.out.println("============");// // 線程 ObjectName Threading = new ObjectName("java.lang:type=Threading"); System.out.println("活動線程:" + getAttribute(mbsc, Threading, "ThreadCount"));// 活動線程 System.out.println("守護程序線程:" + getAttribute(mbsc, Threading, "DaemonThreadCount"));// 守護程序線程 System.out.println("峰值:" + getAttribute(mbsc, Threading, "PeakThreadCount"));// 峰值 System.out.println("啟動的線程總數:" + getAttribute(mbsc, Threading, "TotalStartedThreadCount"));// 啟動的線程總數 ThreadMXBean threadBean2 = ManagementFactory.newPlatformMXBeanProxy (mbsc, ManagementFactory.THREAD_MXBEAN_NAME, ThreadMXBean.class); System.out.println("活動線程:" + threadBean2.getThreadCount());// 活動線程 ThreadMXBean threadBean3 = ManagementFactory.getThreadMXBean(); System.out.println("本地活動線程:" + threadBean3.getThreadCount());// 本地活動線程 System.out.println("============");// ObjectName Compilation = new ObjectName("java.lang:type=Compilation"); System.out.println("總編譯時間 毫秒:" + getAttribute(mbsc, Compilation, "TotalCompilationTime"));// 總編譯時間 毫秒 System.out.println("============");// ObjectName ClassLoading = new ObjectName("java.lang:type=ClassLoading"); System.out.println("已加載類總數:" + getAttribute(mbsc, ClassLoading, "TotalLoadedClassCount"));// 已加載類總數 System.out.println("已加裝當前類:" + getAttribute(mbsc, ClassLoading, "LoadedClassCount"));// 已加裝當前類 System.out.println("已卸載類總數:" + getAttribute(mbsc, ClassLoading, "UnloadedClassCount"));// 已卸載類總數 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運行狀態:" + getAttribute(mbsc, replica, "State"));// 運行狀態 mbsc = createMBeanServer("192.168.1.100", "9992", "controlRole", "123456"); System.out.println("==============節點樹對象==========="); 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(); // 只有一個 while (dataTreeIterator.hasNext()) { ObjectName dataTreeObjectName = dataTreeIterator.next(); DataTreeMXBean dataTree = JMX.newMBeanProxy(mbsc, dataTreeObjectName, DataTreeMXBean.class); System.out.println("節點總數:" + dataTree.getNodeCount());// 節點總數 System.out.println("Watch總數:" + dataTree.getWatchCount());// Watch總數 System.out.println("臨時節點總數:" + dataTree.countEphemerals());// Watch總數 System.out.println("節點名及字符總數:" + dataTree.approximateDataSize());// 節點全路徑和值的總字符數 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服務狀態==========="); 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 + " 活著的連接數:" + ZooKeeperServer.getNumAliveConnections());// 連接數 System.out.println(role + " 未完成請求數:" + ZooKeeperServer.getOutstandingRequests());// 未完成的請求數 System.out.println(role + " 接收的包:" + ZooKeeperServer.getPacketsReceived());// 收到的包 System.out.println(role + " 發送的包:" + ZooKeeperServer.getPacketsSent());// 發送的包 System.out.println(role + " 平均延遲（毫秒）:" + ZooKeeperServer.getAvgRequestLatency()); System.out.println(role + " 最大延遲（毫秒）:" + ZooKeeperServer.getMaxRequestLatency()); System.out.println(role + " 每個客戶端IP允許的最大連接數:" + ZooKeeperServer.getMaxClientCnxnsPerHost()); System.out.println(role + " 最大Session超時（毫秒）:" + ZooKeeperServer.getMaxSessionTimeout()); System.out.println(role + " 心跳時間（毫秒）:" + ZooKeeperServer.getTickTime()); System.out.println(role + " 版本:" + ZooKeeperServer.getVersion());// 版本 // 三個重置操作// ZooKeeperServer.resetLatency(); //重置min/avg/max latency statistics// ZooKeeperServer.resetMaxLatency(); //重置最大延遲統計// ZooKeeperServer.resetStatistics(); // 重置包和延遲所有統計 System.out.println("==============所有客戶端的連接信息==========="); 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());// 發送的包 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(); } } /** * 建立連接 * @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 + " 連接建立失敗"); } return null; } /** * 使用MBeanServer獲取對象名為[objName]的MBean的[objAttr]屬性值 * <p> * 靜態代碼: return MBeanServer.getAttribute(ObjectName name, String attribute) * @param mbeanServer * - MBeanServer實例 * @param objName * - MBean的對象名 * @param objAttr * - MBean的某個屬性名 * @return 屬性值 */ 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; } }}總結
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