zookeeper内部机制与注册监听机制zookeeper应用：集群节点为什么建议奇数个？demo注册，监听到进行业务处理zookeeper应用场景如下等：
zookeeper应用：You can use it off-the-shelf to implement consensus, group management, leader election, and presence protocols. And you can build on it for your own, specific needs.集群节点为什么建议奇数个？...
