zookeeper研究笔记（一）—— single模式搭建
1.安装配置
下载地址 http://www.apache.org/dyn/closer.cgi/zookeeper/
目前我用的版本是3.4.5 下载解压后 cd 到根目录
由于zookeeper是由jar启动，那么所谓的安装就是修改配置文件。
cd 到conf目录
appletekiMacBook-Pro-2:zookeeper-3.4.5 apple$ cd conf
查看下
appletekiMacBook-Pro-2:conf apple$ cat zoo_sample.cfg
zoo_sample.cfg内容如下
# 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
各个参数注释已讲的相当明了，和常见的时间配置不同的是这里有tick的概念
initLimit=10 及10*2000毫秒
粗略看下，然后修改文件名
appletekiMacBook-Pro-2:conf apple$ mv zoo_sample.cfg zoo.cfg
启动
sh-3.2# bin/zkServer.sh start如果看到这个，证明你已经成功启动
JMX enabled by default Using config: /Users/apple/soft/zookeeper-3.4.5/bin/../conf/zoo.cfg Starting zookeeper ... STARTED
2.命令行接口
客户端连接zookeeper
bin/zkCli.sh -server 127.0.0.1:2181
ls命令查看，zookeeper的数据结构和文件系统类似，以后我们细讲
[zk: 127.0.0.1:2181(CONNECTED) 1] ls / [zookeeper]
创建一个测试节点sweetop_test 并和数据my_data关联
[zk: 127.0.0.1:2181(CONNECTED) 2] create /sweetop_test my_data Created /sweetop_test
再次查看
[zk: 127.0.0.1:2181(CONNECTED) 3] ls / [sweetop_test, zookeeper]
发现已经创建好了测试节点，那么现在查看下sweetop节点，看是否关联数据
[zk: 127.0.0.1:2181(CONNECTED) 4] get /sweetop_test my_data cZxid = 0x9 ctime = Fri Apr 12 10:59:37 CST 2013 mZxid = 0x9 mtime = Fri Apr 12 10:59:37 CST 2013 pZxid = 0x9 cversion = 0 dataVersion = 0 aclVersion = 0 ephemeralOwner = 0x0 dataLength = 7 numChildren = 0
修改下关联的数据
[zk: 127.0.0.1:2181(CONNECTED) 7] set /sweetop_test lastsweetop cZxid = 0x9 ctime = Fri Apr 12 10:59:37 CST 2013 mZxid = 0xb mtime = Fri Apr 12 11:05:29 CST 2013 pZxid = 0x9 cversion = 0 dataVersion = 2 aclVersion = 0 ephemeralOwner = 0x0 dataLength = 11 numChildren = 0 [zk: 127.0.0.1:2181(CONNECTED) 8] get /sweetop_test lastsweetop cZxid = 0x9 ctime = Fri Apr 12 10:59:37 CST 2013 mZxid = 0xb mtime = Fri Apr 12 11:05:29 CST 2013 pZxid = 0x9 cversion = 0 dataVersion = 2 aclVersion = 0 ephemeralOwner = 0x0 dataLength = 11 numChildren = 0
删除sweetop_test节点
[zk: 127.0.0.1:2181(CONNECTED) 9] delete /sweetop_test [zk: 127.0.0.1:2181(CONNECTED) 12] ls / [zookeeper]