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https://issues.apache.org/jira/browse/ZOOKEEPER-138?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Patrick Hunt resolved ZOOKEEPER-138.
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Resolution: Fixed
Hadoop Flags: [Reviewed]
Committed revision 706834. (as part of ZOOKEEPER-23)
> c client watcher objects can lose events
> ----------------------------------------
>
> Key: ZOOKEEPER-138
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-138
> Project: Zookeeper
> Issue Type: Bug
> Components: c client
> Affects Versions: 3.0.0
> Reporter: Patrick Hunt
> Assignee: Benjamin Reed
> Fix For: 3.0.0
>
>
> 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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