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?


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