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前言
ZooKeeper是Hadoop家族的一款高性能的分布式協作的產品。在單機中，系統協作大都是進程級的操作。分布式系統中，服務協作都是跨服務器才能完成的。在ZooKeeper之前，我們對于協作服務大都使用消息中間件，隨著分布式系統的普及，用消息中間件完成協作，會有大量的程序開發。ZooKeeper直接面向于分布式系統，可以減少我們自己的開發，幫助我們更好完成分布式系統的數據管理問題。
目錄
- zookeeper介紹
- zookeeper單節點安裝
- zookeeper偽分布式集群安裝
- zookeeper命令行操作
- Java編程現實命令行操作
1. zookeeper介紹
ZooKeeper是一個為分布式應用所設計的分布的、開源的協調服務，它主要是用來解決分布式應用中經常遇到的一些數據管理問題，簡化分布式應用協調及其管理的難度，提供高性能的分布式服務。ZooKeeper本身可以以Standalone模式安裝運行，不過它的長處在于通過分布式ZooKeeper集群（一個Leader，多個Follower），基于一定的策略來保證ZooKeeper集群的穩定性和可用性，從而實現分布式應用的可靠性。
ZooKeeper是作為分布式協調服務，是不需要依賴于Hadoop的環境，也可以為其他的分布式環境提供服務。
2. zookeeper單節點安裝Standalones模式
系統環境：
- Linux Ubuntu 12.04.2 LTS 64bit server
- Java: 1.6.0_29 64-Bit Server VM
~ uname -a
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
~ cat /etc/issue
Ubuntu 12.04.2 LTS \n \l
~ java -version
java version "1.6.0_29"
Java(TM) SE Runtime Environment (build 1.6.0_29-b11)
Java HotSpot(TM) 64-Bit Server VM (build 20.4-b02, mixed mode)
下載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
ckTime=2000
initLimit=10
syncLimit=5
dataDir=/home/conan/zoo/zk0
clientPort=2181
非常簡單，我們已經配置好了的zookeeper單節點
啟動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的服務顯示為QuorumPeerMain
~ jps
5321 QuorumPeerMain
5338 Jps
#查看運行狀態
~ bin/zkServer.sh status
JMX enabled by default
Using config: /home/conan/zoo/zk0/zookeeper345/bin/../conf/zoo.cfg
Mode: standalone
單節點的時，Mode會顯示為standalone
停止ZooKeeper服務
~ bin/zkServer.sh stop
JMX enabled by default
Using config: /home/conan/zoo/zk0/zookeeper345/bin/../conf/zoo.cfg
Stopping zookeeper ... STOPPED
3. zookeeper偽分布式集群安裝
所謂 “ 偽分布式集群 ” 就是在，在一臺PC中，啟動多個ZooKeeper的實例。“ 完全分布式集群 ” 是每臺PC，啟動一個ZooKeeper實例。
由于我的測試環境PC數量有限，所以在一臺PC中，啟動3個ZooKeeper的實例。
創建環境目錄
~ 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
分別修改配置文件
修改：dataDir,clientPort
增加：集群的實例，server.X，”X”表示每個目錄中的myid的值
~ vi /home/conan/toolkit/zookeeper345/conf/zk1.cfg
ckTime=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
ckTime=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個節點的ZooKeeper集群配置完成，接下來我們的啟動服務。
啟動集群
~ /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
#查看節點狀態
~ /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
我們可以看到zk2是leader，zk1和zk3是follower
查看ZooKeeper物理文件目錄結構
~ 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
我們通過客戶端連接ZooKeeper的集群，我們可以任意的zookeeper是進行連接。
~ /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]
集群已連接，下面我們要使用一下，ZooKeeper的命令行操作。
命令行操作
通過help打印命令行幫助
[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的結構，很像是目錄結構，我們看到了像ls這樣熟悉的命令。
#ls,查看/目錄內容
[zk: 192.168.1.201(CONNECTED) 1] ls /
[zookeeper]
#create,創建一個znode節點
[zk: 192.168.1.201(CONNECTED) 2] create /node conan
Created /node
#ls,再查看/目錄
[zk: 192.168.1.201(CONNECTED) 3] ls /
[node, zookeeper]
#get,查看/node的數據信息
[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,修改數據
[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的數據信息，已改為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,刪除/node
[zk: 192.168.1.201(CONNECTED) 7] delete /node
[zk: 192.168.1.201(CONNECTED) 8] ls /
[zookeeper]
#quit,退出客戶端連接
[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編程現實命令行操作
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 {
// 創建一個與服務器的連接
ZooKeeper zk = new ZooKeeper("192.168.1.201:2181", 60000, new Watcher() {
// 監控所有被觸發的事件
public void process(WatchedEvent event) {
System.out.println("EVENT:" + event.getType());
}
});
// 查看根節點
System.out.println("ls / => " + zk.getChildren("/", true));
// 創建一個目錄節點
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節點數據
System.out.println("get /node => " + new String(zk.getData("/node", false, null)));
// 查看根節點
System.out.println("ls / => " + zk.getChildren("/", true));
}
// 創建一個子目錄節點
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節點
System.out.println("ls /node => " + zk.getChildren("/node", true));
}
// 修改節點數據
if (zk.exists("/node", true) != null) {
zk.setData("/node", "changed".getBytes(), -1);
// 查看/node節點數據
System.out.println("get /node => " + new String(zk.getData("/node", false, null)));
}
// 刪除節點
if (zk.exists("/node/sub1", true) != null) {
zk.delete("/node/sub1", -1);
zk.delete("/node", -1);
// 查看根節點
System.out.println("ls / => " + zk.getChildren("/", true));
}
// 關閉連接
zk.close();
}
}
運行結果：
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>
基礎講完，接下來就讓我動手管理起，我們自己的分布式系統吧。
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