JAVA后期拓展（二）ZooKeeper——分布式应用程序协调服务系统

参考：

zookeeper原理 https://cailin.iteye.com/blog/2014486/

zookeeper介绍 http://developer.51cto.com/art/201809/583184.htm

zookeeper入门 https://blog.csdn.net/java_66666/article/details/81015302