ZeeKeeper 集群 伪分布式配置 zookeeper的使用

y23335793

　　纯粹笔记 ：不多说了。
　　解压tar.gz文件,配置修改配置conf
　　1,将zoo_sample.cfg 拷贝3分 zoo1.cfg，zoo2.cfg，zoo3.cfg
　　******************************************************************

　　1，zoo1.cfg:
　　－－－－－－－－－－－－－－－－－－－－－－－－－－－
　　tina@ubuntu:~/zookeeper/conf$ cat zoo1.cfg
# The number of milliseconds of each tick
tickTime=2000
# The number of ticks that the initial
# synchronization phase can take
initLimit=10
# The number of ticks that can pass between
# sending a request and getting an acknowledgement
syncLimit=5
# the directory where the snapshot is stored.
dataDir=/home/sina/zookeeper/data
# the port at which the clients will connect
clientPort=2184
server.1=localhost:2888:3888
server.2=localhost:2889:3889
server.3=localhost:2890:3890

　　×××××××××××××××××××××××××××××××××××××××××××××××
　　%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
　　×××××××××××××××××××××××××××××××××××××××××××××××××
　　2，zoo2.cfg
　　------------------------------------------------------------------------------------
　　tina@ubuntu:~/zookeeper/conf$ more zoo2.cfg
# The number of milliseconds of each tick
tickTime=2000
# The number of ticks that the initial
# synchronization phase can take
initLimit=10
# The number of ticks that can pass between
# sending a request and getting an acknowledgement
syncLimit=5
# the directory where the snapshot is stored.
dataDir=/home/sina/zookeeper/data1
# the port at which the clients will connect
clientPort=2182
server.1=localhost:2888:3888
server.2=localhost:2889:3889
server.3=localhost:2890:3890

　　******************************************************************
　　&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&
　　*********************************************************************
　　3，zoo3.cfg
　　-------------------------------------------------------------------------------------
　　tina@ubuntu:~/zookeeper/conf$ more zoo3.cfg
# The number of milliseconds of each tick
tickTime=2000
# The number of ticks that the initial
# synchronization phase can take
initLimit=10
# The number of ticks that can pass between
# sending a request and getting an acknowledgement
syncLimit=5
# the directory where the snapshot is stored.
dataDir=/home/sina/zookeeper/data2
# the port at which the clients will connect
clientPort=2183
server.1=localhost:2888:3888
server.2=localhost:2889:3889
server.3=localhost:2890:3890

　　×××××××××××××××××××××××××××××××××××××××××××××××××
　　》》》分别在 /data，data1,data2，下建立myid 文件，内容分别是1，2，3
　　－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－
　　

　　启动zookeeper服务
　　分别启动1，2，3：
　　./zkServer.sh start zoo1.cfg
　　./zkServer.sh start zoo2.cfg
　　./zkServer.sh start zoo3.cfg
　　前面两个起的时候可能会有错误提示：
　　2012-11-21 01:28:12,848 - WARN [QuorumPeer:/0:0:0:0:0:0:0:0:2184:QuorumCnxManager@379] - Cannot open channel to 3 at election address localhost/127.0.0.1:3890
java.net.ConnectException: Connection refused
　　2012-11-21 01:28:12,847 - WARN [QuorumPeer:/0:0:0:0:0:0:0:0:2184:QuorumCnxManager@379] - Cannot open channel to 2 at election address localhost/127.0.0.1:3889
java.net.ConnectException: Connection refused
　　这个可以不用管，等服务都起来之后就不会有这个提示了
　　好了 一样画瓢来个示例：
　　import java.io.IOException;

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

public class demo {

// 会话超时时间，设置为与系统默认时间一致

private static final int SESSION_TIMEOUT = 30000;

// 创建 ZooKeeper 实例

ZooKeeper zk;

// 创建 Watcher 实例

Watcher wh = new Watcher() {

public void process(org.apache.zookeeper.WatchedEvent event) {
System.out.println("event="+event.toString());
}

};

// 初始化 ZooKeeper 实例

private void createZKInstance() throws IOException{
zk = new ZooKeeper("localhost:2183", demo.SESSION_TIMEOUT, this.wh);
　　//这里随便随便3个中的任何一个都是可以连接的了
}

private void ZKOperations() throws IOException, InterruptedException, KeeperException{

System.out.println("\n 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("\n 查看是否创建成功： ");

System.out.println(new String(zk.getData("/zoo2", false, null)));

System.out.println("\n 修改节点数据 ");

zk.setData("/zoo2", "shenlan211314".getBytes(), -1);

System.out.println("\n 查看是否修改成功： ");

System.out.println(new String(zk.getData("/zoo2", false, null)));
System.out.println("\n 修改节点数据 ");

zk.setData("/zoo2", "Hello_World".getBytes(), -1);

System.out.println("\n 查看是否修改成功： ");

System.out.println(new String(zk.getData("/zoo2", false, null)));

System.out.println("\n 删除节点 ");

zk.delete("/zoo2", -1);

System.out.println("\n 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 {
demo dm = new demo();
dm.createZKInstance();
dm.ZKOperations();
dm.ZKClose();
}

}