ZooKeeper的基本运转流程：
1、选举Leader。
2、同步数据。
3、选举Leader过程中算法有很多，但要达到的选举标准是一致的。
4、Leader要具有最高的执行ID，类似root权限。
5、集群中大多数的机器得到响应并接受选出的Leader。
官方地址 http://zookeeper.apache.org/
此处测试用的是3.4.11版本 http://mirror.bit.edu.cn/apache/zookeeper/zookeeper-3.4.11/
windows安装(此处忽略linux安装)
将压缩包直接解压后如下图所示
接下来在conf目录下新建zoo.cfg文件，文件内容如下
# 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. #存储内存中数据库快照的位置，如果不设置参数，更新事务日志将被存储到默认位置 dataDir=E:\\zookeeperDtaedir #日志存贮位置 dataLogDir=E:\\zookeeper-logs # the port at which the clients will connect clientPort=2181 # the maximum number of client connections. # increase this if you need to handle more clients #maxClientCnxns=60 # # 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
启动zookeeper
zkServer.cmd
