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https://issues.apache.org/jira/browse/ZOOKEEPER-50?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mahadev konar updated ZOOKEEPER-50:
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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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