大数据_Zookeeper_ZooKeeper伪分布式集群安装及使用

From: http://blog.fens.me/hadoop-zookeeper-intro/

查看 zk的目录结构     zkCli.sh -server-port 2181

让Hadoop跑在云端系列文章，介绍了如何整合虚拟化和Hadoop，让Hadoop集群跑在VPS虚拟主机上，通过云向用户提供存储和计算的服务。

现在硬件越来越便宜，一台非品牌服务器，2颗24核CPU，配48G内存，2T的硬盘，已经降到2万块人民币以下了。这种配置如果简单地放几个web应用，显然是奢侈的浪费。就算是用来实现单节点的hadoop，对计算资源浪费也是非常高的。对于这么高性能的计算机，如何有效利用计算资源，就成为成本控制的一项重要议题了。

通过虚拟化技术，我们可以将一台服务器，拆分成12台VPS，每台2核CPU，4G内存，40G硬盘，并且支持资源重新分配。多么伟大的技术啊！现在我们有了12个节点的hadoop集群， 让Hadoop跑在云端，让世界加速。

前言

ZooKeeper是Hadoop家族的一款高性能的分布式协作的产品。在单机中，系统协作大都是进程级的操作。分布式系统中，服务协作都是跨服务器才能完成的。在ZooKeeper之前，我们对于协作服务大都使用消息中间件，随着分布式系统的普及，用消息中间件完成协作，会有大量的程序开发。ZooKeeper直接面向于分布式系统，可以减少我们自己的开发，帮助我们更好完成分布式系统的数据管理问题。

目录

1. zookeeper介绍
2. zookeeper单节点安装
3. zookeeper伪分布式集群安装
4. zookeeper命令行操作
5. Java编程现实命令行操作

1. zookeeper介绍

ZooKeeper是一个为分布式应用所设计的分布的、开源的协调服务，它主要是用来解决分布式应用中经常遇到的一些数据管理问题，简化分布式应用协调及其管理的难度，提供高性能的分布式服务。ZooKeeper本身可以以Standalone模式安装运行，不过它的长处在于通过分布式ZooKeeper集群（一个Leader，多个Follower），基于一定的策略来保证ZooKeeper集群的稳定性和可用性，从而实现分布式应用的可靠性。

ZooKeeper是作为分布式协调服务，是不需要依赖于Hadoop的环境，也可以为其他的分布式环境提供服务。

2. zookeeper单节点安装Standalones模式

系统环境：

• Linux Ubuntu 12.04.2 LTS 64bit server
• Java: 1.6.0_29 64-Bit Server VM

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1. ~ uname -a  
2. Linux conan 3.5.0-23-generic #35~precise1-Ubuntu SMP Fri Jan 25 17:13:26 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux  
3.   
4. ~ cat /etc/issue  
5. Ubuntu 12.04.2 LTS \n \l  
6.   
7. ~ java -version  
8. java version "1.6.0_29"  
9. Java(TM) SE Runtime Environment (build 1.6.0_29-b11)  
10. Java HotSpot(TM) 64-Bit Server VM (build 20.4-b02, mixed mode)  

下载zookeeper

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1. ~ mkdir /home/conan/toolkit  
2. ~ cd /home/conan/toolkit  
3. ~ wget http://apache.dataguru.cn/zookeeper/stable/zookeeper-3.4.5.tar.gz  
4. ~ tar xvf zookeeper-3.4.5.tar.gz  
5. ~ mv zookeeper-3.4.5 zookeeper345  
6. ~ cd zookeeper345  
7. ~ ls -l  
8. drwxr-xr-x  2 conan conan    4096 Aug 12 04:34 bin  
9. -rw-r--r--  1 conan conan   75988 Aug 12 04:34 build.xml  
10. -rw-r--r--  1 conan conan   70223 Aug 12 04:34 CHANGES.txt  
11. drwxr-xr-x  2 conan conan    4096 Aug 12 04:34 conf  
12. drwxr-xr-x 10 conan conan    4096 Aug 12 04:34 contrib  
13. drwxr-xr-x  2 conan conan    4096 Aug 12 04:34 dist-maven  
14. drwxr-xr-x  6 conan conan    4096 Aug 12 04:34 docs  
15. -rw-r--r--  1 conan conan    1953 Aug 12 04:34 ivysettings.xml  
16. -rw-r--r--  1 conan conan    3120 Aug 12 04:34 ivy.xml  
17. drwxr-xr-x  4 conan conan    4096 Aug 12 04:34 lib  
18. -rw-r--r--  1 conan conan   11358 Aug 12 04:34 LICENSE.txt  
19. -rw-r--r--  1 conan conan     170 Aug 12 04:34 NOTICE.txt  
20. -rw-r--r--  1 conan conan    1770 Aug 12 04:34 README_packaging.txt  
21. -rw-r--r--  1 conan conan    1585 Aug 12 04:34 README.txt  
22. drwxr-xr-x  5 conan conan    4096 Aug 12 04:34 recipes  
23. drwxr-xr-x  8 conan conan    4096 Aug 12 04:34 src  
24. -rw-r--r--  1 conan conan 1315806 Aug 12 04:34 zookeeper-3.4.5.jar  
25. -rw-r--r--  1 conan conan     833 Aug 12 04:34 zookeeper-3.4.5.jar.asc  
26. -rw-r--r--  1 conan conan      33 Aug 12 04:34 zookeeper-3.4.5.jar.md5  
27. -rw-r--r--  1 conan conan      41 Aug 12 04:34 zookeeper-3.4.5.jar.sha1  

修改配置文件conf/zoo.cfg

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1. <strong>~ mkdir /home/conan/zoo/zk0  
2. ~ cp conf/zoo_sample.cfg conf/zoo.cfg  
3.   
4. ~ vi conf/zoo.cfg  
5. ckTime=2000  
6. initLimit=10  
7. syncLimit=5  
8. dataDir=/home/conan/zoo/zk0  
9. clientPort=2181  
10. </strong>  

非常简单，我们已经配置好了的zookeeper单节点

启动zookeeper

~ bin/zkServer.sh
JMX enabled by default
Using config: /home/conan/zoo/zk0/zookeeper345/bin/../conf/zoo.cfg
Usage: bin/zkServer.sh {start|start-foreground|stop|restart|status|upgrade|print-cmd}
conan@conan:~/zoo/zk0/zookeeper345$ bin/zkServer.sh start
JMX enabled by default
Using config: /home/conan/zoo/zk0/zookeeper345/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED

#zk的服务显示为QuorumPeerMain
~ jps
5321 QuorumPeerMain
5338 Jps

#查看运行状态
~ bin/zkServer.sh status
JMX enabled by default
Using config: /home/conan/zoo/zk0/zookeeper345/bin/../conf/zoo.cfg
Mode: standalone

节点的时，Mode会显示为standalone

停止ZooKeeper服务

~ bin/zkServer.sh stopJMX enabled by defaultUsing config: /home/conan/zoo/zk0/zookeeper345/bin/../conf/zoo.cfgStopping zookeeper ... STOPPED

3. zookeeper伪分布式集群安装

所谓 “伪分布式集群” 就是在，在一台PC中，启动多个ZooKeeper的实例。“完全分布式集群” 是每台PC，启动一个ZooKeeper实例。

由于我的测试环境PC数量有限，所以在一台PC中，启动3个ZooKeeper的实例。

创建环境目录

~ mkdir /home/conan/zoo/zk1~ mkdir /home/conan/zoo/zk2~ mkdir /home/conan/zoo/zk3#新建myid文件~ echo "1" > /home/conan/zoo/zk1/myid~ echo "2" > /home/conan/zoo/zk2/myid~ echo "3" > /home/conan/zoo/zk3/myid

分别修改配置文件
修改：dataDir,clientPort
增加：集群的实例，server.X，”X”表示每个目录中的myid的值

~ vi /home/conan/toolkit/zookeeper345/conf/zk1.cfgckTime=2000initLimit=10syncLimit=5dataDir=/home/conan/zoo/zk1clientPort=2181server.1=192.168.1.201:2888:3888server.2=192.168.1.201:2889:3889server.3=192.168.1.201:2890:3890~ vi /home/conan/toolkit/zookeeper345/conf/zk2.cfgckTime=2000initLimit=10syncLimit=5dataDir=/home/conan/zoo/zk2clientPort=2182server.1=192.168.1.201:2888:3888server.2=192.168.1.201:2889:3889server.3=192.168.1.201:2890:3890~ vi /home/conan/toolkit/zookeeper345/conf/zk3.cfgtickTime=2000initLimit=10syncLimit=5dataDir=/home/conan/zoo/zk3clientPort=2183server.1=192.168.1.201:2888:3888server.2=192.168.1.201:2889:3889server.3=192.168.1.201:2890:3890

3个节点的ZooKeeper集群配置完成，接下来我们的启动服务。

启动集群

~ /home/conan/toolkit/zookeeper345/bin/zkServer.sh start zk1.cfg~ /home/conan/toolkit/zookeeper345/bin/zkServer.sh start zk2.cfg~ /home/conan/toolkit/zookeeper345/bin/zkServer.sh start zk3.cfg~ jps5422 QuorumPeerMain5395 QuorumPeerMain5463 QuorumPeerMain5494 Jps#查看节点状态~ /home/conan/toolkit/zookeeper345/bin/zkServer.sh status zk1.cfgJMX enabled by defaultUsing config: /home/conan/toolkit/zookeeper345/bin/../conf/zk1.cfgMode: follower~ /home/conan/toolkit/zookeeper345/bin/zkServer.sh status zk2.cfgJMX enabled by defaultUsing config: /home/conan/toolkit/zookeeper345/bin/../conf/zk2.cfgMode: leader~ /home/conan/toolkit/zookeeper345/bin/zkServer.sh status zk3.cfgJMX enabled by defaultUsing config: /home/conan/toolkit/zookeeper345/bin/../conf/zk3.cfgMode: follower

我们可以看到zk2是leader，zk1和zk3是follower

查看ZooKeeper物理文件目录结构

~ tree  -L 3 /home/conan/zoo/home/conan/zoo├── zk0├── zk1│   ├── myid│   ├── version-2│   │   ├── acceptedEpoch│   │   ├── currentEpoch│   │   ├── log.100000001│   │   └── snapshot.0│   └── zookeeper_server.pid├── zk2│   ├── myid│   ├── version-2│   │   ├── acceptedEpoch│   │   ├── currentEpoch│   │   ├── log.100000001│   │   └── snapshot.0│   └── zookeeper_server.pid└── zk3    ├── myid    ├── version-2    │   ├── acceptedEpoch    │   ├── currentEpoch    │   ├── log.100000001    │   └── snapshot.100000000    └── zookeeper_server.pid7 directories, 18 files

4. zookeeper命令行操作

我们通过客户端连接ZooKeeper的集群，我们可以任意的zookeeper是进行连接。

~ /home/conan/toolkit/zookeeper345/bin/zkCli.sh -server 192.168.1.201:2181Connecting to 192.168.1.2012013-08-12 05:25:39,260 [myid:] - INFO  [main:Environment@100] - Client environment:zookeeper.version=3.4.5-1392090, built on 09/30/2012 17:52 GMT2013-08-12 05:25:39,267 [myid:] - INFO  [main:Environment@100] - Client environment:host.name=conan2013-08-12 05:25:39,269 [myid:] - INFO  [main:Environment@100] - Client environment:java.version=1.6.0_292013-08-12 05:25:39,269 [myid:] - INFO  [main:Environment@100] - Client environment:java.vendor=Sun Microsystems Inc.2013-08-12 05:25:39,270 [myid:] - INFO  [main:Environment@100] - Client environment:java.home=/home/conan/toolkit/jdk16/jre2013-08-12 05:25:39,270 [myid:] - INFO  [main:Environment@100] - Client environment:java.class.path=/home/conan/toolkit/zookeeper345/bin/../build/classes:/home/conan/toolkit/zookeeper345/bin/../build/lib/*.jar:/home/conan/toolkit/zookeeper345/bin/../lib/slf4j-log4j12-1.6.1.jar:/home/conan/toolkit/zookeeper345/bin/../lib/slf4j-api-1.6.1.jar:/home/conan/toolkit/zookeeper345/bin/../lib/netty-3.2.2.Final.jar:/home/conan/toolkit/zookeeper345/bin/../lib/log4j-1.2.15.jar:/home/conan/toolkit/zookeeper345/bin/../lib/jline-0.9.94.jar:/home/conan/toolkit/zookeeper345/bin/../zookeeper-3.4.5.jar:/home/conan/toolkit/zookeeper345/bin/../src/java/lib/*.jar:/home/conan/toolkit/zookeeper345/bin/../conf:2013-08-12 05:25:39,271 [myid:] - INFO  [main:Environment@100] - Client environment:java.library.path=/home/conan/toolkit/jdk16/jre/lib/amd64/server:/home/conan/toolkit/jdk16/jre/lib/amd64:/home/conan/toolkit/jdk16/jre/../lib/amd64:/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib2013-08-12 05:25:39,275 [myid:] - INFO  [main:Environment@100] - Client environment:java.io.tmpdir=/tmp2013-08-12 05:25:39,276 [myid:] - INFO  [main:Environment@100] - Client environment:java.compiler=2013-08-12 05:25:39,276 [myid:] - INFO  [main:Environment@100] - Client environment:os.name=Linux2013-08-12 05:25:39,277 [myid:] - INFO  [main:Environment@100] - Client environment:os.arch=amd642013-08-12 05:25:39,281 [myid:] - INFO  [main:Environment@100] - Client environment:os.version=3.5.0-23-generic2013-08-12 05:25:39,282 [myid:] - INFO  [main:Environment@100] - Client environment:user.name=conan2013-08-12 05:25:39,282 [myid:] - INFO  [main:Environment@100] - Client environment:user.home=/home/conan2013-08-12 05:25:39,283 [myid:] - INFO  [main:Environment@100] - Client environment:user.dir=/home/conan/zoo2013-08-12 05:25:39,284 [myid:] - INFO  [main:ZooKeeper@438] - Initiating client connection, connectString=192.168.1.201 sessionTimeout=30000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@22ba6c83Welcome to ZooKeeper!JLine support is enabled[zk: 192.168.1.201(CONNECTING) 0] 2013-08-12 05:25:39,336 [myid:] - INFO  [main-SendThread(192.168.1.201:2181):ClientCnxn$SendThread@966] - Opening socket connection to server 192.168.1.201/192.168.1.201:2181. Will not attempt to authenticate using SASL (Unable to locate a login configuration)2013-08-12 05:25:39,345 [myid:] - INFO  [main-SendThread(192.168.1.201:2181):ClientCnxn$SendThread@849] - Socket connection established to 192.168.1.201/192.168.1.201:2181, initiating session2013-08-12 05:25:39,384 [myid:] - INFO  [main-SendThread(192.168.1.201:2181):ClientCnxn$SendThread@1207] - Session establishment complete on server 192.168.1.201/192.168.1.201:2181, sessionid = 0x1406f3c1ef90001, negotiated timeout = 30000WATCHER::WatchedEvent state:SyncConnected type:None path:null[zk: 192.168.1.201(CONNECTED) 0]

集群已连接，下面我们要使用一下，ZooKeeper的命令行操作。

命令行操作
通过help打印命令行帮助

[zk: 192.168.1.201(CONNECTED) 1] helpZooKeeper -server host:port cmd args        connect host:port        get path [watch]        ls path [watch]        set path data [version]        rmr path        delquota [-n|-b] path        quit        printwatches on|off        create [-s] [-e] path data acl        stat path [watch]        close        ls2 path [watch]        history        listquota path        setAcl path acl        getAcl path        sync path        redo cmdno        addauth scheme auth        delete path [version]        setquota -n|-b val path

ZooKeeper的结构，很像是目录结构，我们看到了像ls这样熟悉的命令。

#ls,查看/目录内容[zk: 192.168.1.201(CONNECTED) 1] ls /[zookeeper]#create,创建一个znode节点[zk: 192.168.1.201(CONNECTED) 2] create /node conanCreated /node#ls,再查看/目录[zk: 192.168.1.201(CONNECTED) 3] ls /[node, zookeeper]#get,查看/node的数据信息[zk: 192.168.1.201(CONNECTED) 4] get /nodeconancZxid = 0x100000006ctime = Mon Aug 12 05:32:49 CST 2013mZxid = 0x100000006mtime = Mon Aug 12 05:32:49 CST 2013pZxid = 0x100000006cversion = 0dataVersion = 0aclVersion = 0ephemeralOwner = 0x0dataLength = 5numChildren = 0#set,修改数据[zk: 192.168.1.201(CONNECTED) 5] set /node fens.mecZxid = 0x100000006ctime = Mon Aug 12 05:32:49 CST 2013mZxid = 0x100000007mtime = Mon Aug 12 05:34:32 CST 2013pZxid = 0x100000006cversion = 0dataVersion = 1aclVersion = 0ephemeralOwner = 0x0dataLength = 7numChildren = 0#get,再查看/node的数据信息，已改为fens.me[zk: 192.168.1.201(CONNECTED) 6] get /nodefens.mecZxid = 0x100000006ctime = Mon Aug 12 05:32:49 CST 2013mZxid = 0x100000007mtime = Mon Aug 12 05:34:32 CST 2013pZxid = 0x100000006cversion = 0dataVersion = 1aclVersion = 0ephemeralOwner = 0x0dataLength = 7numChildren = 0#delete,删除/node[zk: 192.168.1.201(CONNECTED) 7] delete /node[zk: 192.168.1.201(CONNECTED) 8] ls /[zookeeper]#quit,退出客户端连接[zk: 192.168.1.201(CONNECTED) 19] quitQuitting...2013-08-12 05:40:29,304 [myid:] - INFO  [main:ZooKeeper@684] - Session: 0x1406f3c1ef90002 closed2013-08-12 05:40:29,305 [myid:] - INFO  [main-EventThread:ClientCnxn$EventThread@509] - EventThread shut down

5. Java编程现实命令行操作

package org.conan.zookeeper.demo;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;public class BasicDemo1 {    public static void main(String[] args) throws IOException, KeeperException, InterruptedException {        // 创建一个与服务器的连接        ZooKeeper zk = new ZooKeeper("192.168.1.201:2181", 60000, new Watcher() {            // 监控所有被触发的事件            public void process(WatchedEvent event) {                System.out.println("EVENT:" + event.getType());            }        });        // 查看根节点        System.out.println("ls / => " + zk.getChildren("/", true));        // 创建一个目录节点        if (zk.exists("/node", true) == null) {            zk.create("/node", "conan".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);            System.out.println("create /node conan");            // 查看/node节点数据            System.out.println("get /node => " + new String(zk.getData("/node", false, null)));            // 查看根节点            System.out.println("ls / => " + zk.getChildren("/", true));        }        // 创建一个子目录节点        if (zk.exists("/node/sub1", true) == null) {            zk.create("/node/sub1", "sub1".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);            System.out.println("create /node/sub1 sub1");            // 查看node节点            System.out.println("ls /node => " + zk.getChildren("/node", true));        }        // 修改节点数据        if (zk.exists("/node", true) != null) {            zk.setData("/node", "changed".getBytes(), -1);            // 查看/node节点数据            System.out.println("get /node => " + new String(zk.getData("/node", false, null)));        }        // 删除节点        if (zk.exists("/node/sub1", true) != null) {            zk.delete("/node/sub1", -1);            zk.delete("/node", -1);            // 查看根节点            System.out.println("ls / => " + zk.getChildren("/", true));        }        // 关闭连接        zk.close();    }}

运行结果：

2013-08-12 15:33:29,699 [myid:] - INFO  [main:Environment@97] - Client environment:zookeeper.version=3.3.1-942149, built on 05/07/2010 17:14 GMT2013-08-12 15:33:29,702 [myid:] - INFO  [main:Environment@97] - Client environment:host.name=PC2013042021402013-08-12 15:33:29,702 [myid:] - INFO  [main:Environment@97] - Client environment:java.version=1.6.0_452013-08-12 15:33:29,702 [myid:] - INFO  [main:Environment@97] - Client environment:java.vendor=Sun Microsystems Inc.2013-08-12 15:33:29,702 [myid:] - INFO  [main:Environment@97] - Client environment:java.home=D:\toolkit\java\jdk6\jre2013-08-12 15:33:29,703 [myid:] - INFO  [main:Environment@97] - Client environment:java.class.path=D:\workspace\java\zkdemo\target\classes;C:\Users\Administrator\.m2\repository\org\apache\hadoop\zookeeper\3.3.1\zookeeper-3.3.1.jar;C:\Users\Administrator\.m2\repository\log4j\log4j\1.2.15\log4j-1.2.15.jar;C:\Users\Administrator\.m2\repository\javax\mail\mail\1.4\mail-1.4.jar;C:\Users\Administrator\.m2\repository\javax\activation\activation\1.1\activation-1.1.jar;C:\Users\Administrator\.m2\repository\jline\jline\0.9.94\jline-0.9.94.jar;C:\Users\Administrator\.m2\repository\junit\junit\3.8.1\junit-3.8.1.jar2013-08-12 15:33:29,703 [myid:] - INFO  [main:Environment@97] - Client environment:java.library.path=D:\toolkit\java\jdk6\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;D:\toolkit\Rtools\bin;D:\toolkit\Rtools\gcc-4.6.3\bin;C:\Program Files (x86)\Common Files\NetSarang;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;D:\toolkit\Git\cmd;D:\toolkit\Git\bin;C:\Program Files (x86)\Microsoft SQL Server\100\Tools\Binn\;C:\Program Files\Microsoft SQL Server\100\Tools\Binn\;C:\Program Files\Microsoft SQL Server\100\DTS\Binn\;c:\Program Files (x86)\Common Files\Ulead Systems\MPEG;C:\Program Files (x86)\QuickTime\QTSystem\;D:\toolkit\MiKTex\miktex\bin\x64\;D:\toolkit\sshclient;D:\toolkit\ant19\bin;D:\toolkit\eclipse;D:\toolkit\gradle15\bin;D:\toolkit\java\jdk6\bin;D:\toolkit\maven3\bin;D:\toolkit\mysql56\bin;D:\toolkit\python27;D:\toolkit\putty;C:\Program Files\R\R-3.0.1\bin\x64;D:\toolkit\mongodb243\bin;D:\toolkit\php54;D:\toolkit\nginx140;D:\toolkit\nodejs;D:\toolkit\npm12\bin;D:\toolkit\java\jdk6\jre\bin\server;.2013-08-12 15:33:29,703 [myid:] - INFO  [main:Environment@97] - Client environment:java.io.tmpdir=C:\Users\ADMINI~1\AppData\Local\Temp\2013-08-12 15:33:29,704 [myid:] - INFO  [main:Environment@97] - Client environment:java.compiler=2013-08-12 15:33:29,704 [myid:] - INFO  [main:Environment@97] - Client environment:os.name=Windows 72013-08-12 15:33:29,704 [myid:] - INFO  [main:Environment@97] - Client environment:os.arch=amd642013-08-12 15:33:29,705 [myid:] - INFO  [main:Environment@97] - Client environment:os.version=6.12013-08-12 15:33:29,705 [myid:] - INFO  [main:Environment@97] - Client environment:user.name=Administrator2013-08-12 15:33:29,705 [myid:] - INFO  [main:Environment@97] - Client environment:user.home=C:\Users\Administrator2013-08-12 15:33:29,706 [myid:] - INFO  [main:Environment@97] - Client environment:user.dir=D:\workspace\java\zkdemo2013-08-12 15:33:29,707 [myid:] - INFO  [main:ZooKeeper@373] - Initiating client connection, connectString=192.168.1.201:2181 sessionTimeout=60000 watcher=org.conan.zookeeper.demo.BasicDemo1$1@3dfeca642013-08-12 15:33:29,731 [myid:] - INFO  [main-SendThread():ClientCnxn$SendThread@1000] - Opening socket connection to server /192.168.1.201:21812013-08-12 15:33:38,736 [myid:] - INFO  [main-SendThread(192.168.1.201:2181):ClientCnxn$SendThread@908] - Socket connection established to 192.168.1.201/192.168.1.201:2181, initiating session2013-08-12 15:33:38,804 [myid:] - INFO  [main-SendThread(192.168.1.201:2181):ClientCnxn$SendThread@701] - Session establishment complete on server 192.168.1.201/192.168.1.201:2181, sessionid = 0x1406f3c1ef9000d, negotiated timeout = 60000EVENT:Nonels / => [zookeeper]EVENT:NodeCreatedEVENT:NodeChildrenChangedcreate /node conanget /node => conanls / => [node, zookeeper]EVENT:NodeCreatedcreate /node/sub1 sub1ls /node => [sub1]EVENT:NodeDataChangedget /node => changedEVENT:NodeDeletedEVENT:NodeChildrenChangedEVENT:NodeChildrenChangedls / => [zookeeper]2013-08-12 15:33:38,877 [myid:] - INFO  [main:ZooKeeper@538] - Session: 0x1406f3c1ef9000d closed

pom.xml，maven配置文件

<?xml version="1.0" encoding="UTF-8"?><projectxsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><modelVersion>4.0.0</modelVersion><groupId>org.conan.zookeeper</groupId><artifactId>zkdemo</artifactId><version>0.0.1</version><name>zkdemo</name><description>zkdemo</description><dependencies><dependency><groupId>org.apache.hadoop</groupId><artifactId>zookeeper</artifactId><version>3.3.1</version><exclusions><exclusion><groupId>javax.jms</groupId><artifactId>jms</artifactId></exclusion><exclusion><groupId>com.sun.jdmk</groupId><artifactId>jmxtools</artifactId></exclusion><exclusion><groupId>com.sun.jmx</groupId><artifactId>jmxri</artifactId></exclusion></exclusions></dependency></dependencies></project>

基础讲完，接下来就让我动手管理起，我们自己的分布式系统吧。