ZooKeeper 3.4.3

ZooKeeper是做什么的呢?总体上来说:
针对分布式系统的:
(1)结点管理,特别是集群很大时。
(2)配置文件,特别是需要反复改动的配置。
(3)协同、同步。

自己做实验的话,StandAlone模式就行。

1、下载

wget http://apache.spinellicreations.com/zookeeper/zookeeper-3.4.3/zookeeper-3.4.3.tar.gz
tar -xzvf zookeeper-3.4.3.tar.gz

2、配置文件

cd zookeeper-3.4.3
cd conf
cp zoo_sample.cfg zoo.cfg

然后更改dataDir=为一个非tmp的目录。

3、启动

cd ..
./bin/zkServer.sh start

4、基本命令

cd bin
./zkCli.sh -server 127.0.0.1:2181

列出根目录树

[zk: 127.0.0.1:2181(CONNECTED) 1] ls /
[zookeeper]

创建一个叫做/zk_test的结点,给结点追加字符串数据”test_data”

[zk: 127.0.0.1:2181(CONNECTED) 0] create /zk_test my_data
Created /zk_test

获取/zk_test结点的数据

[zk: 127.0.0.1:2181(CONNECTED) 4] get /zk_test
my_data
cZxid = 0x9
ctime = Mon May 07 12:03:23 CST 2012
mZxid = 0x9
mtime = Mon May 07 12:03:23 CST 2012
pZxid = 0x9
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 7
numChildren = 0

更改/zk_test的数据,再显示

[zk: 127.0.0.1:2181(CONNECTED) 5] set /zk_test abcdefg
cZxid = 0x9
ctime = Mon May 07 12:03:23 CST 2012
mZxid = 0xb
mtime = Mon May 07 12:05:55 CST 2012
pZxid = 0x9
cversion = 0
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 7
numChildren = 0
[zk: 127.0.0.1:2181(CONNECTED) 6] get /zk_test
abcdefg
cZxid = 0x9
ctime = Mon May 07 12:03:23 CST 2012
mZxid = 0xb
mtime = Mon May 07 12:05:55 CST 2012
pZxid = 0x9
cversion = 0
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 7
numChildren = 0

每个结点既可以有孩子,也可以追加数据!

[zk: 127.0.0.1:2181(CONNECTED) 9] create /zk_test/123 456
Created /zk_test/123
[zk: 127.0.0.1:2181(CONNECTED) 10] ls /zk_test
[123]
[zk: 127.0.0.1:2181(CONNECTED) 11] get /zk_test
abcdefg
cZxid = 0x9
ctime = Mon May 07 12:03:23 CST 2012
mZxid = 0xb
mtime = Mon May 07 12:05:55 CST 2012
pZxid = 0xc
cversion = 1
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 7
numChildren = 1

删除结点:

#非空的(有孩子),不能删
[zk: 127.0.0.1:2181(CONNECTED) 12] delete /zk_test
Node not empty: /zk_test

#依次删除孩子,再删除父亲
[zk: 127.0.0.1:2181(CONNECTED) 13] delete /zk_test/123
[zk: 127.0.0.1:2181(CONNECTED) 14] delete /zk_test
[zk: 127.0.0.1:2181(CONNECTED) 16] ls /
[zookeeper]

 

 

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