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Zookeeper实战之嵌入式运行Zookeeper集群模式

很多使用Zookeeper的情景是需要我们嵌入Zookeeper作为自己的分布式应用系统的一部分来提供分布式服务,此时我们需要通过程序的方式来启动Zookeeper。此时可以通过Zookeeper API的ZooKeeperServerMain类来启动Zookeeper服务。
 
下面是一个集群模式下启动Zookeeper服务的例子
 
这里假定我们运行Zookeeper集群的三台机器名分别为fanbinx1,fanbinx2,fanbinx3
 

首先是zoo.cfg配置文件

tickTime=2000
dataDir=/tmp/zookeeper/data
clientPort=2181
initLimit=10
syncLimit=5
server.1=fanbinx1:2888:3888
server.2=fanbinx2:2888:3888
server.3=fanbinx3:2888:3888
启动Zookeeper集群服务的类,如下 
* 这个类同时使用同一个zoo.cfg配置文件来启动Zookeeper服务。
* 在每台机器上启动Zookeeper服务的时候判断当前机器是不是定义在zoo.cfg文件里,如果是获取其中的ID号,然后生成myid文件并将ID写入其中。
* 最后启动Zookeeper服务。

package my.zookeeperstudy.server;
 
import org.apache.commons.io.FileUtils;
import org.apache.zookeeper.server.ServerConfig;
import org.apache.zookeeper.server.ZooKeeperServerMain;
import org.apache.zookeeper.server.quorum.QuorumPeerConfig;
 
import java.io.File;
import java.io.InputStream;
import java.net.InetAddress;
import java.util.Properties;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
public class ClusteredZKServer {
 
    public static void main(String[] args) throws Exception {
        InputStream is = ClusteredZKServer.class.getResourceAsStream("/my/zookeeperstudy/server/zoo.cfg");
        Properties props = new Properties();
        try {
            props.load(is);
        } finally {
            is.close();
        }
 
        for (String key : props.stringPropertyNames()) {
            Pattern pKey = Pattern.compile("^server\\.(\\d)");
            Pattern pValue = http://www.mamicode.com/Pattern.compile("([//w|.]*)://d*://d*");>客户端测试代码如下,这里可以修改hostname为集群中的任意一台机器
package my.zookeeperstudy.server;
 
import org.apache.zookeeper.*;
 
import java.util.List;
 
public class Client {
    public static void main(String[] args) throws Exception {
        ZooKeeper zk = new ZooKeeper("fanbinx1:2181,fanbinx2:2181,fanbinx3:2181", 10000,
                new Watcher() {
                    public void process(WatchedEvent event) {
                        System.out.println("event: " + event.getType());
                    }
                });
 
        System.out.println(zk.getState());
 
        zk.create("/myApps", "myAppsData".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
        zk.create("/myApps/App1", "App1Data".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
        zk.create("/myApps/App2", "App2Data".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
        zk.create("/myApps/App3", "".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
        zk.setData("/myApps/App3","App3Data".getBytes(), -1);
 
        System.out.println(zk.exists("/myApps", true));
        System.out.println(new String(zk.getData("/myApps", true, null)));
 
        List<String> children = zk.getChildren("/myApps", true);
        for (String child : children) {
            System.out.println(new String(zk.getData("/myApps/" + child, true, null)));
            zk.delete("/myApps/" + child,-1);
        }
 
        zk.delete("/myApps",-1);
 
        zk.close();
    }
}

测试
* 在集群中的各个机器上分别运行ClusteredZKServer类来启动Zookeeper服务。
* 然后在任意一台机器上运行Client类来连接Zookeeper并操作数据。


原文链接:Zookeeper实战之嵌入式运行Zookeeper集群模式

Zookeeper实战之嵌入式运行Zookeeper集群模式