hey,

when I'm looking at CuratorZookeeperClient.java, I notice there is a field 
named 'persistentExistNodePath' which is designed to speed up api call between 
dubbo application and zookeeper registry.

My question is if some application (another dubbo application or a management 
system) delete a zookeeper node, CuratorZookeeperClient will not aware it and 
going to create sub node, then it will throw NodeNotFoundException.



any one know the original design or more detail can share?

[1]: 
https://github.com/apache/dubbo/blob/master/dubbo-remoting/dubbo-remoting-zookeeper/src/main/java/org/apache/dubbo/remoting/zookeeper/curator/CuratorZookeeperClient.java

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