Mahadev konar updated ZOOKEEPER-50:

    Fix Version/s: 3.3.0

> Watch event delivery rules
> --------------------------
>                 Key: ZOOKEEPER-50
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-50
>             Project: Zookeeper
>          Issue Type: Bug
>          Components: java client
>            Reporter: Benjamin Reed
>            Assignee: Benjamin Reed
>             Fix For: 3.3.0
> We need to make clear in the documentation and enforce in the code the 
> following watch event rules:
> # A watch event will be delivered once to each watcher, even if it is 
> registered multiple times. For example, if the same watch object is used for 
> getChildren("/foo", watchObj) and getData("/foo", watchObj, stat) and foo is 
> deleted, watchObj will be called once to processed the NodeDeleted event.
> # Session events will be delivered to all watchers.
> *Note: a watcher is a Watcher object in Java or a (watch function, context) 
> pair in C.*
> There is currently a bug in the Java client that causes the session 
> disconnected event to be delivered twice to the default watcher if the 
> default watcher is also used to watch a path. This violates rule 1.

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