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Posted to issues@zookeeper.apache.org by "Kezhu Wang (Jira)" <ji...@apache.org> on 2022/02/21 05:10:00 UTC

[jira] [Created] (ZOOKEEPER-4472) Support persistent watchers removing individually

Kezhu Wang created ZOOKEEPER-4472:
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             Summary: Support persistent watchers removing individually
                 Key: ZOOKEEPER-4472
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-4472
             Project: ZooKeeper
          Issue Type: Improvement
          Components: server
    Affects Versions: 3.7.0, 3.6.3
            Reporter: Kezhu Wang


Persistent watchers could only be removed with {{WatcherType.Any}} now. I think it is meaningful to remove them individually as they are by naming persistent and will not auto removed in server side.

Together with proposed solution from [ZOOKEEPER-4466], it will be clear that ZooKeeper has four kind of watchers:
# Standard data watcher(which includes data and exist watcher in client side).
# Standard child watcher.
# Persistent node watcher(aka. data and child watcher for node).
# Persistent recursive watcher(aka. data watcher for node and its descendants).

See also [ZOOKEEPER-4471]



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