测试zookeeper集群是否健康

转载

mob64ca13fba42b 2024-09-26 14:02:16

文章标签 测试zookeeper集群是否健康 zookeeper System apache 文章分类 运维

https://www.ibm.com/developerworks/cn/data/library/bd-zookeeper/

https://www.ibm.com/developerworks/cn/opensource/os-cn-zookeeper/

1. 下载

官网：http://zookeeper.apache.org/releases.html 下载：zookeeper-3.4.8.tar.gz

2. 安装

因为资源有限，所以我在同一个服务器上面创建3个目录 server1、server2、server3 来模拟3台服务器集群。
cd server1
tar -zxvf zookeeper-3.4.8.tar.gz
mkdir data
mkdir dataLog
data 为数据目录，dataLog 为日志目录。3. 配置

cd zookeeper-3.4.8/conf
创建文件 zoo.cfg，内容如下

tickTime=2000 
initLimit=5
syncLimit=2
dataDir=/opt/zookeeper/server1/data
dataLogDir=/opt/zookeeper/server1/dataLog
clientPort=2181
server.1=zk1server.emind.com:2888:3888
server.2=zk2server.emind.com:2888:3888
server.3=zk3server.emind.com:2888:3888

echo "1" > /var/lib/zookeeper/myid
echo "2" > /var/lib/zookeeper/myid
echo "3" > /var/lib/zookeeper/myid







# server1
tickTime=2000
initLimit=5
syncLimit=2
dataDir=/opt/zookeeper/server1/data
dataLogDir=/opt/zookeeper/server1/dataLog
clientPort=2181
server.1=127.0.0.1:2888:3888
server.2=127.0.0.1:2889:3889
server.3=127.0.0.1:2890:3890
# server2
tickTime=2000
initLimit=5
syncLimit=2
dataDir=/opt/zookeeper/server2/data
dataLogDir=/opt/zookeeper/server2/dataLog
clientPort=2182
server.1=127.0.0.1:2888:3888
server.2=127.0.0.1:2889:3889
server.3=127.0.0.1:2890:3890
# server3
tickTime=2000
initLimit=5
syncLimit=2
dataDir=/opt/zookeeper/server3/data
dataLogDir=/opt/zookeeper/server3/dataLog
clientPort=2183
server.1=127.0.0.1:2888:3888
server.2=127.0.0.1:2889:3889
server.3=127.0.0.1:2890:3890
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.4.6</version>
        </dependency>
package com.shanhy.demo.zookeeper;

import java.io.IOException;

import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooDefs.Ids;
import org.apache.zookeeper.ZooKeeper;

/**
 * Zookeeper测试
 *
 * @create    2016年3月10日
 */
public class Test {

    // 会话超时时间，设置为与系统默认时间一致
    private static final int SESSION_TIMEOUT = 30 * 1000;

    // 创建 ZooKeeper 实例
    private ZooKeeper zk;

    // 创建 Watcher 实例
    private Watcher wh = new Watcher() {
        /**
         * Watched事件
         */
        public void process(WatchedEvent event) {
            System.out.println("WatchedEvent >>> " + event.toString());
        }
    };

    // 初始化 ZooKeeper 实例
    private void createZKInstance() throws IOException {
        // 连接到ZK服务，多个可以用逗号分割写
        zk = new ZooKeeper("192.168.19.130:2181,192.168.19.130:2182,192.168.19.130:2183", Test.SESSION_TIMEOUT, this.wh);

    }

    private void ZKOperations() throws IOException, InterruptedException, KeeperException {
        System.out.println("\n1. 创建 ZooKeeper 节点 (znode ： zoo2, 数据： myData2 ，权限： OPEN_ACL_UNSAFE ，节点类型： Persistent");
        zk.create("/zoo2", "myData2".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);

        System.out.println("\n2. 查看是否创建成功： ");
        System.out.println(new String(zk.getData("/zoo2", this.wh, null)));// 添加Watch

        // 前面一行我们添加了对/zoo2节点的监视，所以这里对/zoo2进行修改的时候，会触发Watch事件。
        System.out.println("\n3. 修改节点数据 ");
        zk.setData("/zoo2", "shanhy20160310".getBytes(), -1);

        // 这里再次进行修改，则不会触发Watch事件，这就是我们验证ZK的一个特性“一次性触发”，也就是说设置一次监视，只会对下次操作起一次作用。
        System.out.println("\n3-1. 再次修改节点数据 ");
        zk.setData("/zoo2", "shanhy20160310-ABCD".getBytes(), -1);

        System.out.println("\n4. 查看是否修改成功： ");
        System.out.println(new String(zk.getData("/zoo2", false, null)));

        System.out.println("\n5. 删除节点 ");
        zk.delete("/zoo2", -1);

        System.out.println("\n6. 查看节点是否被删除： ");
        System.out.println(" 节点状态： [" + zk.exists("/zoo2", false) + "]");
    }

    private void ZKClose() throws InterruptedException {
        zk.close();
    }

    public static void main(String[] args) throws IOException, InterruptedException, KeeperException {
        Test dm = new Test();
        dm.createZKInstance();
        dm.ZKOperations();
        dm.ZKClose();
    }
}
    // 初始化 ZooKeeper 实例
    private void createZKInstance() throws IOException {
        // 连接到ZK服务，多个可以用逗号分割写
        zk = new ZooKeeper("192.168.19.130:2181,192.168.19.130:2182,192.168.19.130:2183", Test.SESSION_TIMEOUT, this.wh);
        if(!zk.getState().equals(States.CONNECTED)){
            while(true){
                if(zk.getState().equals(States.CONNECTED)){
                    break;
                }
                try {
                    TimeUnit.SECONDS.sleep(5);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }
        <!--zkclient -->
        <dependency>
            <groupId>com.101tec</groupId>
            <artifactId>zkclient</artifactId>
            <version>0.7</version>
        </dependency>
package com.shanhy.demo.zookeeper;

import java.util.List;
import java.util.concurrent.TimeUnit;

import org.I0Itec.zkclient.DataUpdater;
import org.I0Itec.zkclient.IZkChildListener;
import org.I0Itec.zkclient.IZkDataListener;
import org.I0Itec.zkclient.IZkStateListener;
import org.I0Itec.zkclient.ZkClient;
import org.apache.zookeeper.Watcher.Event.KeeperState;

/**
 * ZkClient的使用测试
 *
 * @author   单红宇(365384722)
 * @myblog  
 * @create    2016年3月11日
 */
public class ZkClientTest {

    public static void main(String[] args) {
        ZkClient zkClient = new ZkClient("192.168.19.130:2181,192.168.19.130:2182,192.168.19.130:2183");
        String node = "/myapp";

        // 订阅监听事件
        childChangesListener(zkClient, node);
        dataChangesListener(zkClient, node);
        stateChangesListener(zkClient);

        if (!zkClient.exists(node)) {
            zkClient.createPersistent(node, "hello zookeeper");
        }
        System.out.println(zkClient.readData(node));

        zkClient.updateDataSerialized(node, new DataUpdater<String>() {

            public String update(String currentData) {
                return currentData + "-123";
            }
        });
        System.out.println(zkClient.readData(node));

        try {
            TimeUnit.SECONDS.sleep(3);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

    /**
     * 订阅children变化
     *
     * @param zkClient
     * @param path
     * @author SHANHY
     * @create  2016年3月11日
     */
    public static void childChangesListener(ZkClient zkClient, final String path) {
        zkClient.subscribeChildChanges(path, new IZkChildListener() {

            public void handleChildChange(String parentPath, List<String> currentChilds) throws Exception {
                System.out.println("clildren of path " + parentPath + ":" + currentChilds);
            }

        });
    }

    /**
     * 订阅节点数据变化
     *
     * @param zkClient
     * @param path
     * @author SHANHY
     * @create  2016年3月11日
     */
    public static void dataChangesListener(ZkClient zkClient, final String path){
        zkClient.subscribeDataChanges(path, new IZkDataListener(){

            public void handleDataChange(String dataPath, Object data) throws Exception {
                System.out.println("Data of " + dataPath + " has changed.");
            }

            public void handleDataDeleted(String dataPath) throws Exception {
                System.out.println("Data of " + dataPath + " has changed.");
            }

        });
    }

    /**
     * 订阅状态变化
     *
     * @param zkClient
     * @author SHANHY
     * @create  2016年3月11日
     */
    public static void stateChangesListener(ZkClient zkClient){
        zkClient.subscribeStateChanges(new IZkStateListener() {

            public void handleStateChanged(KeeperState state) throws Exception {
                System.out.println("handleStateChanged");
            }

            public void handleSessionEstablishmentError(Throwable error) throws Exception {
                System.out.println("handleSessionEstablishmentError");
            }

            public void handleNewSession() throws Exception {
                System.out.println("handleNewSession");
            }
        });
    }
}

本文章为转载内容，我们尊重原作者对文章享有的著作权。如有内容错误或侵权问题，欢迎原作者联系我们进行内容更正或删除文章。