ZooKeeper伪分布式集群安装及使用

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
  • 下载zookeeper

    ~ mkdir /home/conan/toolkit
    ~ cd /home/conan/toolkit
    ~ wget http://apache.dataguru.cn/zookeeper/stable/zookeeper-3.4.5.tar.gz
    ~ tar xvf zookeeper-3.4.5.tar.gz
    ~ mv zookeeper-3.4.5 zookeeper345
    ~ cd zookeeper345
    ~ ls -l
    drwxr-xr-x  2 conan conan    4096 Aug 12 04:34 bin
    -rw-r--r--  1 conan conan   75988 Aug 12 04:34 build.xml
    -rw-r--r--  1 conan conan   70223 Aug 12 04:34 CHANGES.txt
    drwxr-xr-x  2 conan conan    4096 Aug 12 04:34 conf
    drwxr-xr-x 10 conan conan    4096 Aug 12 04:34 contrib
    drwxr-xr-x  2 conan conan    4096 Aug 12 04:34 dist-maven
    drwxr-xr-x  6 conan conan    4096 Aug 12 04:34 docs
    -rw-r--r--  1 conan conan    1953 Aug 12 04:34 ivysettings.xml
    -rw-r--r--  1 conan conan    3120 Aug 12 04:34 ivy.xml
    drwxr-xr-x  4 conan conan    4096 Aug 12 04:34 lib
    -rw-r--r--  1 conan conan   11358 Aug 12 04:34 LICENSE.txt
    -rw-r--r--  1 conan conan     170 Aug 12 04:34 NOTICE.txt
    -rw-r--r--  1 conan conan    1770 Aug 12 04:34 README_packaging.txt
    -rw-r--r--  1 conan conan    1585 Aug 12 04:34 README.txt
    drwxr-xr-x  5 conan conan    4096 Aug 12 04:34 recipes
    drwxr-xr-x  8 conan conan    4096 Aug 12 04:34 src
    -rw-r--r--  1 conan conan 1315806 Aug 12 04:34 zookeeper-3.4.5.jar
    -rw-r--r--  1 conan conan     833 Aug 12 04:34 zookeeper-3.4.5.jar.asc
    -rw-r--r--  1 conan conan      33 Aug 12 04:34 zookeeper-3.4.5.jar.md5
    -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

    
    ~ mkdir /home/conan/zoo/zk0
    ~ cp conf/zoo_sample.cfg conf/zoo.cfg
    
    ~ vi conf/zoo.cfg
    tickTime=2000
    initLimit=10
    syncLimit=5
    dataDir=/home/conan/zoo/zk0
    clientPort=2181
    

    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
    

    单节点的时,Mode会显示为standalone

    停止ZooKeeper服务

    
    ~ bin/zkServer.sh stop
    JMX enabled by default
    Using config: /home/conan/zoo/zk0/zookeeper345/bin/../conf/zoo.cfg
    Stopping 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.cfg
    tickTime=2000
    initLimit=10
    syncLimit=5
    dataDir=/home/conan/zoo/zk1
    clientPort=2181
    server.1=192.168.1.201:2888:3888
    server.2=192.168.1.201:2889:3889
    server.3=192.168.1.201:2890:3890
    
    ~ vi /home/conan/toolkit/zookeeper345/conf/zk2.cfg
    tickTime=2000
    initLimit=10
    syncLimit=5
    dataDir=/home/conan/zoo/zk2
    clientPort=2182
    server.1=192.168.1.201:2888:3888
    server.2=192.168.1.201:2889:3889
    server.3=192.168.1.201:2890:3890
    
    ~ vi /home/conan/toolkit/zookeeper345/conf/zk3.cfg
    tickTime=2000
    initLimit=10
    syncLimit=5
    dataDir=/home/conan/zoo/zk3
    clientPort=2183
    server.1=192.168.1.201:2888:3888
    server.2=192.168.1.201:2889:3889
    server.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
    
    ~ jps
    5422 QuorumPeerMain
    5395 QuorumPeerMain
    5463 QuorumPeerMain
    5494 Jps
    
    #查看节点状态
    ~ /home/conan/toolkit/zookeeper345/bin/zkServer.sh status zk1.cfg
    JMX enabled by default
    Using config: /home/conan/toolkit/zookeeper345/bin/../conf/zk1.cfg
    Mode: follower
    
    ~ /home/conan/toolkit/zookeeper345/bin/zkServer.sh status zk2.cfg
    JMX enabled by default
    Using config: /home/conan/toolkit/zookeeper345/bin/../conf/zk2.cfg
    Mode: leader
    
    ~ /home/conan/toolkit/zookeeper345/bin/zkServer.sh status zk3.cfg
    JMX enabled by default
    Using config: /home/conan/toolkit/zookeeper345/bin/../conf/zk3.cfg
    Mode: 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.pid
    
    7 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 192.168.1.201:2181
    
    Connecting to 192.168.1.201
    2013-08-12 05:25:39,260 [myid:] - INFO  [main:Environment@100] - Client environment:zookeeper.version=3.4.5-1392090, built on 09/30/2012 17:52 GMT
    2013-08-12 05:25:39,267 [myid:] - INFO  [main:Environment@100] - Client environment:host.name=conan
    2013-08-12 05:25:39,269 [myid:] - INFO  [main:Environment@100] - Client environment:java.version=1.6.0_29
    2013-08-12 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/jre
    2013-08-12 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/lib
    2013-08-12 05:25:39,275 [myid:] - INFO  [main:Environment@100] - Client environment:java.io.tmpdir=/tmp
    2013-08-12 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=Linux
    2013-08-12 05:25:39,277 [myid:] - INFO  [main:Environment@100] - Client environment:os.arch=amd64
    2013-08-12 05:25:39,281 [myid:] - INFO  [main:Environment@100] - Client environment:os.version=3.5.0-23-generic
    2013-08-12 05:25:39,282 [myid:] - INFO  [main:Environment@100] - Client environment:user.name=conan
    2013-08-12 05:25:39,282 [myid:] - INFO  [main:Environment@100] - Client environment:user.home=/home/conan
    2013-08-12 05:25:39,283 [myid:] - INFO  [main:Environment@100] - Client environment:user.dir=/home/conan/zoo
    2013-08-12 05:25:39,284 [myid:] - INFO  [main:ZooKeeper@438] - Initiating client connection, connectString=192.168.1.201 sessionTimeout=30000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@22ba6c83
    Welcome to ZooKeeper!
    JLine support is enabled
    [zk: 192.168.1.201(CONNECTING) 0] 2013-08-12 05:25:39,336 [myid:] - INFO  [main-SendThread(192.168.1.201:2181):ClientCnxn$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$SendThread@849] - Socket connection established to 192.168.1.201/192.168.1.201:2181, initiating session
    2013-08-12 05:25:39,384 [myid:] - INFO  [main-SendThread(192.168.1.201:2181):ClientCnxn$SendThread@1207] - Session establishment complete on server 192.168.1.201/192.168.1.201:2181, sessionid = 0x1406f3c1ef90001, negotiated timeout = 30000
    
    WATCHER::
    
    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] help
    ZooKeeper -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 conan
    Created /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 /node
    conan
    cZxid = 0x100000006
    ctime = Mon Aug 12 05:32:49 CST 2013
    mZxid = 0x100000006
    mtime = Mon Aug 12 05:32:49 CST 2013
    pZxid = 0x100000006
    cversion = 0
    dataVersion = 0
    aclVersion = 0
    ephemeralOwner = 0x0
    dataLength = 5
    numChildren = 0
    
    #set,修改数据
    [zk: 192.168.1.201(CONNECTED) 5] set /node fens.me
    cZxid = 0x100000006
    ctime = Mon Aug 12 05:32:49 CST 2013
    mZxid = 0x100000007
    mtime = Mon Aug 12 05:34:32 CST 2013
    pZxid = 0x100000006
    cversion = 0
    dataVersion = 1
    aclVersion = 0
    ephemeralOwner = 0x0
    dataLength = 7
    numChildren = 0
    
    #get,再查看/node的数据信息,已改为fens.me
    [zk: 192.168.1.201(CONNECTED) 6] get /node
    fens.me
    cZxid = 0x100000006
    ctime = Mon Aug 12 05:32:49 CST 2013
    mZxid = 0x100000007
    mtime = Mon Aug 12 05:34:32 CST 2013
    pZxid = 0x100000006
    cversion = 0
    dataVersion = 1
    aclVersion = 0
    ephemeralOwner = 0x0
    dataLength = 7
    numChildren = 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] quit
    Quitting...
    2013-08-12 05:40:29,304 [myid:] - INFO  [main:ZooKeeper@684] - Session: 0x1406f3c1ef90002 closed
    2013-08-12 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 GMT
    2013-08-12 15:33:29,702 [myid:] - INFO  [main:Environment@97] - Client environment:host.name=PC201304202140
    2013-08-12 15:33:29,702 [myid:] - INFO  [main:Environment@97] - Client environment:java.version=1.6.0_45
    2013-08-12 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\jre
    2013-08-12 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.jar
    2013-08-12 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 7
    2013-08-12 15:33:29,704 [myid:] - INFO  [main:Environment@97] - Client environment:os.arch=amd64
    2013-08-12 15:33:29,705 [myid:] - INFO  [main:Environment@97] - Client environment:os.version=6.1
    2013-08-12 15:33:29,705 [myid:] - INFO  [main:Environment@97] - Client environment:user.name=Administrator
    2013-08-12 15:33:29,705 [myid:] - INFO  [main:Environment@97] - Client environment:user.home=C:\Users\Administrator
    2013-08-12 15:33:29,706 [myid:] - INFO  [main:Environment@97] - Client environment:user.dir=D:\workspace\java\zkdemo
    2013-08-12 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$1@3dfeca64
    2013-08-12 15:33:29,731 [myid:] - INFO  [main-SendThread():ClientCnxn$SendThread@1000] - Opening socket connection to server /192.168.1.201:2181
    2013-08-12 15:33:38,736 [myid:] - INFO  [main-SendThread(192.168.1.201:2181):ClientCnxn$SendThread@908] - Socket connection established to 192.168.1.201/192.168.1.201:2181, initiating session
    2013-08-12 15:33:38,804 [myid:] - INFO  [main-SendThread(192.168.1.201:2181):ClientCnxn$SendThread@701] - Session establishment complete on server 192.168.1.201/192.168.1.201:2181, sessionid = 0x1406f3c1ef9000d, negotiated timeout = 60000
    EVENT:None
    ls / => [zookeeper]
    EVENT:NodeCreated
    EVENT:NodeChildrenChanged
    create /node conan
    get /node => conan
    ls / => [node, zookeeper]
    EVENT:NodeCreated
    create /node/sub1 sub1
    ls /node => [sub1]
    EVENT:NodeDataChanged
    get /node => changed
    EVENT:NodeDeleted
    EVENT:NodeChildrenChanged
    EVENT:NodeChildrenChanged
    ls / => [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"?>
    <project
    xsi: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>

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