zookeeper

Posted 2020-08-09 大数据从业者

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篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了zookeeper相关的知识，希望对你有一定的参考价值。

一、zookeeper监控方式

根据官网介绍主要有两种监控方式，
1：使用ssh建立远程连接，然后使用"echo stat \| nc ip port"命令返回结果。开源项目代表taokeeper。
2：使用JMX监控，文档[http://zookeeper.apache.org/doc/r3.4.6/zookeeperJMX.html]
我们考虑使用JMX监控是因为运维不希望在服务器之间配置ssh连接，或者openSSH，服务器太多难以管理用户密码和公钥，容易混乱。

二、zookeeper服务开启JMX监控

修改zookeeper的启动脚本vim zkServer.sh。找到启动参数ZOOMAIN，修改为下面值。
其中local.only=false，设为false才能在远程建立连接。

[java] view plain copy

ZOOMAIN="-Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.local.only=false
-Djava.rmi.server.hostname=127.0.0.1
-Dcom.sun.management.jmxremote.port=9991
-Dcom.sun.management.jmxremote.ssl=true
-Dcom.sun.management.jmxremote.authenticate=true
-Dcom.sun.management.jmxremote.access.file=/data/zookeeper/conf/jmxremote.access
-Dcom.sun.management.jmxremote.password.file=/data/zookeeper/conf/jmxremote.password
-Dzookeeper.jmx.log4j.disable=true
org.apache.zookeeper.server.quorum.QuorumPeerMain"

在/data/zookeeper/conf目录下建立2个访问授权文件, 修改文件权限chmod 600 jmxremote.*

[java] view plain copy

-rw------- 1 deploy deploy 149 Aug 6 13:44 jmxremote.access
-rw------- 1 deploy deploy 40 Aug 6 13:46 jmxremote.password
[deploy@liutp conf]$ pwd
/data/zookeeper/conf
[deploy@liutp conf]$ cat jmxremote.access
monitorRole readonly
controlRole readwrite \
create javax.management.monitor.*,javax.management.timer.* \
unregister
[deploy@liutp conf]$ cat jmxremote.password
monitorRole 1234567
controlRole 1234567
[deploy@liutp conf]$

关于权限文件内容的设置可以参考jdk里的文件：C:\Java\jdk1.7.0_79\jre\lib\management\jmxremote.password.template
重启zk服务：zkServer.sh restart /data/zookeeper/conf/zk1.cfg

三、使用Java自带的JConsole

在命令行输入JConsole，再回车。
在弹出的界面选择“远程进程”，输入“服务器IP:9991”(zookeeper服务器的IP和端口)
用户名：controlRole密码：1234567就能查看节点数，连接数，watch数

技术分享

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：

[java] view plain copy

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;
}
}
}

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