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

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

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-4471?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kezhu Wang reassigned ZOOKEEPER-4471:
-------------------------------------

    Assignee: Kezhu Wang

> 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: 3.6.3, 3.7.0
>            Reporter: Kezhu Wang
>            Assignee: Kezhu Wang
>            Priority: Major
>
> {{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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