Austin Shoemaker resolved ZOOKEEPER-890.

    Resolution: Not A Problem

Closing, C client works as intended. Submitted a patch in ZOOKEEPER-888 to 
handle this properly in zkpython.

> C client invokes watcher callbacks multiple times
> -------------------------------------------------
>                 Key: ZOOKEEPER-890
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-890
>             Project: Zookeeper
>          Issue Type: Bug
>          Components: c client
>    Affects Versions: 3.3.1
>         Environment: Mac OS X 10.6.5
>            Reporter: Austin Shoemaker
>            Priority: Critical
>         Attachments: watcher_twice.c, ZOOKEEPER-890.patch
> Code using the C client assumes that watcher callbacks are called exactly 
> once. If the watcher is called more than once, the process will likely 
> overwrite freed memory and/or crash.
> collect_session_watchers (zk_hashtable.c) gathers watchers from 
> active_node_watchers, active_exist_watchers, and active_child_watchers 
> without removing them. This results in watchers being invoked more than once.
> Test code is attached that reproduces the bug, along with a proposed patch.

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