[jira] [Created] (ZOOKEEPER-4471) Remove WatcherType.Children break persistent watcher's child events

["Kezhu Wang (Jira)" <ji...@apache.org>]

Kezhu Wang created ZOOKEEPER-4471:
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             Summary: Remove WatcherType.Children break persistent watcher's child events
                 Key: ZOOKEEPER-4471
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-4471
             Project: ZooKeeper
          Issue Type: Bug
          Components: server
    Affects Versions: 3.7.0, 3.6.3
            Reporter: Kezhu Wang


{{AddWatchMode.PERSISTENT}} was divided as data and child watch in server side. When remove {{WatcherType.Children}}, child part of {{AddWatchMode.PERSISTENT}} is removed but not its data part. This could introduce trick usage of persistent data watch while there is no official api for this. It is better forbid this by dedicate {{WatcherType.Children}} to standard child watch only.

I [commits|https://github.com/kezhuw/zookeeper/commit/f7a996646074114830bdc2361e8ff679d08c00bc] a modified {{RemoveWatchesTest.testRemoveAllChildWatchesOnAPath}} in my local repo to reproduce this.

I think it is better to support {{removeWatches}} for two persistent watchers too. But it might be a separate issue.



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