zookeeper初试

实验环境:

os-platform: windows7 x64
jdk: 1.7

 

参考文档:

http://www.ibm.com/developerworks/cn/opensource/os-cn-zookeeper/
http://zookeeper.apache.org/doc/r3.4.6/
http://blog.csdn.net/rengq126/article/details/7393227

 

1.下载zookeeper,这里选用stable版本的3.4.6

下载地址:http://apache.fayea.com/zookeeper/zookeeper-3.4.6/

 

2.配置安装zookeeper

下载完成后,将zookeeper-3.4.6.tar.gz解压到指定目录(如,D:/zookeeper-3.4.6)。
重命名conf/zoo_sample.cfg为zoo.cfg,其中关键配置请至少保留以下项:

tickTime=2000
dataDir=D:/zookeeper-3.4.6/data
clientPort=2181

配置项分别为:
心跳频率,每2000ms发送一次心跳包
数据路径,可用于数据落地,确保zookeeper宕机后数据不丢失(一般用来保障那些永久性节点)
服务端口,即客户端的连接端口,zookeeper用来监听客户端的请求

 

3.启动和关闭,以及客户端的连接

启动方式:
  bin/zkServer.cmd 或 bin/zkServer.sh start

关闭方式:
  遗憾的是windows只能手动Ctrl+C关掉server,而linux则可以通过bin/zkServer.sh stop完成关闭操作

客户端连接:
  bin/zkCli.cmd 或者 bin/zkCli.cmd -server 127.0.0.1:2181

 

4.zookeeper api using demo(可用来了解watcher和zk的基础操作)

package org.kongdl.zookeeper.demo;

import java.io.*;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooDefs.Ids;
import org.apache.zookeeper.ZooKeeper;

public class ZookeeperDemo {
    
    private static final int SESSION_TIMEOUT = 3000;
    
    public static void main(String[] args) {
        ZookeeperDemo demo = new ZookeeperDemo();
        try {
            demo.zkOperations();
        } catch(Exception e) {
            e.printStackTrace();
        }
    }
    
    private void zkOperations() throws IOException, InterruptedException, KeeperException{
        ZooKeeper zk = createZookeeperInstance();
        
        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", "mydata".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", true, null)));
        
        System.out.println("\n3. 修改节点数据 ");
        zk.setData("/zoo2", "lichmama".getBytes(), -1);
        
        System.out.println("\n4. 查看是否修改成功: ");
        System.out.println(new String(zk.getData("/zoo2", true, 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", true) + "]");
        
        System.out.println("\n7. 关闭client连接");
        zk.close();
    }
    
    private ZooKeeper createZookeeperInstance() throws IOException {
        return new ZooKeeper("localhost:2181", ZookeeperDemo.SESSION_TIMEOUT, new Watcher() {
            public void process(org.apache.zookeeper.WatchedEvent event) {
                System.out.println(event.toString());
            }
        });
    }
}

 

posted @ 2015-11-07 17:16  lichmama  阅读(246)  评论(0编辑  收藏  举报