Patrick Hunt updated ZOOKEEPER-137:

    Attachment: ZOOKEEPER-137.patch

This patch adds a new WatcherTest to verify the failure condition. I've updated 
the clientcnxn code (and zookeeper.java) to correctly materialize the watchers 
that need to process an incoming watch event.

All tests now pass, including the new test case that explicitly verifies this 

Note: hudson has been seeing intermittent failures due to this issue. 
ClientTest was occasionally failing due to missing events.

> client watcher objects can lose events
> --------------------------------------
>                 Key: ZOOKEEPER-137
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-137
>             Project: Zookeeper
>          Issue Type: Bug
>          Components: java client
>    Affects Versions: 3.0.0
>            Reporter: Patrick Hunt
>            Assignee: Patrick Hunt
>             Fix For: 3.0.0
>         Attachments: ZOOKEEPER-137.patch
> if a single watcher (A) is registered on a single node for both a getdata and 
> exists watch the second watch event may be lost:
> 1) getdata("node", A)
> 2) setdata("node"...)
> 3) exists("node", A)
> 4) delete("node"...)
> if watch events for 2 is processed on the client (zookeeper.java, zkwatcher) 
> after 3 completes then the zkwatcher process event method will clear the 
> watch and the subsequent operation's (4) event will be ignored

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