Curator 存在版本兼容问题。
Curator 2.x.x-兼容两个zk 3.4.x 和zk 3.5.x，
Curator 3.x.x-兼容兼容zk 3.5。
Versions
The are currently two released versions of Curator, 2.x.x and 3.x.x:
Curator 2.x.x - compatible with both ZooKeeper 3.4.x and ZooKeeper 3.5.x
Curator 3.x.x - compatible only with ZooKeeper 3.5.x and includes support for new features such as dynamic reconfiguration, etc.