Watch event delivery rules
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Key: ZOOKEEPER-50
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-50
Project: Zookeeper
Issue Type: Bug
Components: java client
Reporter: Benjamin Reed
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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