[jira] Created: (ZOOKEEPER-890) C client invokes watcher callbacks multiple times

[Austin Shoemaker (JIRA)]

C client invokes watcher callbacks multiple times
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                 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

The collect_session_watchers function in zk_hashtable.c gathers watchers from 
active_node_watchers, active_exist_watchers, and active_child_watchers without 
removing the watchers from the table.

Please see attached repro case and patch.

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