ZooKeeper安装运行

ZooKeeper介绍 ZooKeeper是Hadoop的正式子项目，它是一个针对大型分布式系统的可靠协调系统，提供的功能包括：配置维护、名字服务、分布式同步、组服务等。ZooKeeper的目标就是封装好复杂易出错的关键服务，将简单易用的接口和性能高效、功能稳定的系统提供给用户。Zookeeper是Google的Chubby一个开源的实现.是高有效和可靠的协同工作系统.Zookeeper能够用

cuiran

31805人浏览 · 2013-01-16 14:51:52

cuiran · 2013-01-16 14:51:52 发布

ZooKeeper介绍

ZooKeeper是Hadoop的正式子项目，它是一个针对大型分布式系统的可靠协调系统，提供的功能包括：配置维护、名字服务、分布式同步、组服务等。ZooKeeper的目标就是封装好复杂易出错的关键服务，将简单易用的接口和性能高效、功能稳定的系统提供给用户。

Zookeeper是Google的Chubby一个开源的实现.是高有效和可靠的协同工作系统.Zookeeper能够用来leader选举,配置信息维护等.在一个分布式的环境中,我们需要一个Master实例或存储一些配置信息,确保文件写入的一致性等.Zookeeper能够保证如下3点:

Watches are ordered with respect to other events, other watches, and
asynchronous replies. The ZooKeeper client libraries ensures that
everything is dispatched in order.
A client will see a watch event for a znode it is watching before seeing the new data that corresponds to that znode.
The order of watch events from ZooKeeper corresponds to the order of the updates as seen by the ZooKeeper service.

在Zookeeper中,znode是一个跟Unix文件系统路径相似的节点,可以往这个节点存储或获取数据.如果在创建znode时Flag设置为EPHEMERAL,那么当这个创建这个znode的节点和Zookeeper失去连接后,这个znode将不再存在在Zookeeper 里.Zookeeper使用Watcher察觉事件信息,当客户端接收到事件信息,比如连接超时,节点数据改变,子节点改变,可以调用相应的行为来处理数据.Zookeeper的Wiki页面展示了如何使用Zookeeper来处理事件通知,队列,优先队列,锁,共享锁,可撤销的共享锁,两阶段提交.

ZooKeeper官网

Zookeeper官网

ZooKeeper安装

首先下载最新版 zookeeper-3.4.5.tar.gz

然后解压

tar zxvf zookeeper-3.4.5.tar.gz

然后进入conf目录修改zoo_sample.cfg为zoo.cfg

然后vi zoo.cfg

更改为：

# 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.
# do not use /tmp for storage, /tmp here is just 
# example sakes.
dataDir=/tmp/zookeeper
# the port at which the clients will connect
clientPort=2181
#
# Be sure to read the maintenance section of the 
# administrator guide before turning on autopurge.
#
# http://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_maintenance
#
# The number of snapshots to retain in dataDir
#autopurge.snapRetainCount=3
# Purge task interval in hours
# Set to "0" to disable auto purge feature
#autopurge.purgeInterval=1

编辑保存后进入bin目录执行

./zkServer.sh start

ZooKeeper测试

[root@localhost bin]# ./zkCli.sh
Connecting to localhost:2181
2013-01-16 14:36:22,484 [myid:] - INFO  [main:Environment@100] - Client environment:zookeeper.version=3.4.5-1392090, built on 09/30/2012 17:52 GMT
2013-01-16 14:36:22,488 [myid:] - INFO  [main:Environment@100] - Client environment:host.name=localhost.localdomain
2013-01-16 14:36:22,489 [myid:] - INFO  [main:Environment@100] - Client environment:java.version=1.6.0_29
2013-01-16 14:36:22,489 [myid:] - INFO  [main:Environment@100] - Client environment:java.vendor=Sun Microsystems Inc.
2013-01-16 14:36:22,490 [myid:] - INFO  [main:Environment@100] - Client environment:java.home=/usr/java/jdk1.6.0_29/jre
2013-01-16 14:36:22,490 [myid:] - INFO  [main:Environment@100] - Client environment:java.class.path=/usr/local/zookeeper-3.4.5/bin/../build/classes:/usr/local/zookeeper-3.4.5/bin/../build/lib/*.jar:/usr/local/zookeeper-3.4.5/bin/../lib/slf4j-log4j12-1.6.1.jar:/usr/local/zookeeper-3.4.5/bin/../lib/slf4j-api-1.6.1.jar:/usr/local/zookeeper-3.4.5/bin/../lib/netty-3.2.2.Final.jar:/usr/local/zookeeper-3.4.5/bin/../lib/log4j-1.2.15.jar:/usr/local/zookeeper-3.4.5/bin/../lib/jline-0.9.94.jar:/usr/local/zookeeper-3.4.5/bin/../zookeeper-3.4.5.jar:/usr/local/zookeeper-3.4.5/bin/../src/java/lib/*.jar:/usr/local/zookeeper-3.4.5/bin/../conf:./:/usr/java/jdk1.6.0_29/lib:/usr/java/jdk1.6.0_29/jre/lib
2013-01-16 14:36:22,491 [myid:] - INFO  [main:Environment@100] - Client environment:java.library.path=/usr/java/jdk1.6.0_29/jre/lib/i386/client:/usr/java/jdk1.6.0_29/jre/lib/i386:/usr/java/jdk1.6.0_29/jre/../lib/i386:/usr/java/packages/lib/i386:/lib:/usr/lib
2013-01-16 14:36:22,491 [myid:] - INFO  [main:Environment@100] - Client environment:java.io.tmpdir=/tmp
2013-01-16 14:36:22,491 [myid:] - INFO  [main:Environment@100] - Client environment:java.compiler=<NA>
2013-01-16 14:36:22,492 [myid:] - INFO  [main:Environment@100] - Client environment:os.name=Linux
2013-01-16 14:36:22,492 [myid:] - INFO  [main:Environment@100] - Client environment:os.arch=i386
2013-01-16 14:36:22,493 [myid:] - INFO  [main:Environment@100] - Client environment:os.version=2.6.18-308.24.1.el5
2013-01-16 14:36:22,493 [myid:] - INFO  [main:Environment@100] - Client environment:user.name=root
2013-01-16 14:36:22,493 [myid:] - INFO  [main:Environment@100] - Client environment:user.home=/root
2013-01-16 14:36:22,494 [myid:] - INFO  [main:Environment@100] - Client environment:user.dir=/usr/local/zookeeper-3.4.5/bin
2013-01-16 14:36:22,496 [myid:] - INFO  [main:ZooKeeper@438] - Initiating client connection, connectString=localhost:2181 sessionTimeout=30000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@5ffb18
Welcome to ZooKeeper!
2013-01-16 14:36:22,592 [myid:] - INFO  [main-SendThread(localhost.localdomain:2181):ClientCnxn$SendThread@966] - Opening socket connection to server localhost.localdomain/127.0.0.1:2181. Will not attempt to authenticate using SASL (无法定位登录配置)
2013-01-16 14:36:22,601 [myid:] - INFO  [main-SendThread(localhost.localdomain:2181):ClientCnxn$SendThread@849] - Socket connection established to localhost.localdomain/127.0.0.1:2181, initiating session
JLine support is enabled
2013-01-16 14:36:22,693 [myid:] - INFO  [main-SendThread(localhost.localdomain:2181):ClientCnxn$SendThread@1207] - Session establishment complete on server localhost.localdomain/127.0.0.1:2181, sessionid = 0x13c3c5224cc0000, negotiated timeout = 30000

WATCHER::

WatchedEvent state:SyncConnected type:None path:null
[zk: localhost:2181(CONNECTED) 0] 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
[zk: localhost:2181(CONNECTED) 1] create /my_data "data.ch.com"
Created /my_data
[zk: localhost:2181(CONNECTED) 2] get /my_data
"data.ch.com"
cZxid = 0x2
ctime = Wed Jan 16 14:38:20 CST 2013
mZxid = 0x2
mtime = Wed Jan 16 14:38:20 CST 2013
pZxid = 0x2
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 13
numChildren = 0
[zk: localhost:2181(CONNECTED) 3] set /my_date "123456.com"
Node does not exist: /my_date
[zk: localhost:2181(CONNECTED) 4] set /my_data "123456.com"
cZxid = 0x2
ctime = Wed Jan 16 14:38:20 CST 2013
mZxid = 0x4
mtime = Wed Jan 16 14:38:58 CST 2013
pZxid = 0x2
cversion = 0
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 12
numChildren = 0
[zk: localhost:2181(CONNECTED) 5] get /my_data
"123456.com"
cZxid = 0x2
ctime = Wed Jan 16 14:38:20 CST 2013
mZxid = 0x4
mtime = Wed Jan 16 14:38:58 CST 2013
pZxid = 0x2
cversion = 0
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 12
numChildren = 0
[zk: localhost:2181(CONNECTED) 6] create /mytemp "你好吗"
Created /mytemp
[zk: localhost:2181(CONNECTED) 7] get /myt
Node does not exist: /myt
[zk: localhost:2181(CONNECTED) 8] get /mytemp
"你好吗"
cZxid = 0x5
ctime = Wed Jan 16 14:40:44 CST 2013
mZxid = 0x5
mtime = Wed Jan 16 14:40:44 CST 2013
pZxid = 0x5
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 11
numChildren = 0
[zk: localhost:2181(CONNECTED) 9] get /mytemp
"你好吗"
cZxid = 0x5
ctime = Wed Jan 16 14:40:44 CST 2013
mZxid = 0x5
mtime = Wed Jan 16 14:40:44 CST 2013
pZxid = 0x5
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 11
numChildren = 0
[zk: localhost:2181(CONNECTED) 10] get /my_data
"123456.com"
cZxid = 0x2
ctime = Wed Jan 16 14:38:20 CST 2013
mZxid = 0x4
mtime = Wed Jan 16 14:38:58 CST 2013
pZxid = 0x2
cversion = 0
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 12
numChildren = 0
[zk: localhost:2181(CONNECTED) 11] ls
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
[zk: localhost:2181(CONNECTED) 12]

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