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From Daniel Gómez Ferro (Commented) (JIRA) <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-442) need a way to remove watches that are no longer of interest
Date Wed, 19 Oct 2011 09:34:10 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-442?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13130468#comment-13130468
] 

Daniel Gómez Ferro commented on ZOOKEEPER-442:
----------------------------------------------

Are we still interested on this feature after [ZOOKEEPER-1177|https://issues.apache.org/jira/browse/ZOOKEEPER-1177]
gets integrated?

I have implemented a prototype based on Patrick's suggestion. Issues:
* The removal doesn't guarantee that the watcher won't trigger.
* If the user can specify a concrete watcher to be removed, sometimes we only have to remove
the watcher on the client's side without contacting the server. If we want the async version
of the call we need a mechanism to trigger the callback directly.

                
> need a way to remove watches that are no longer of interest
> -----------------------------------------------------------
>
>                 Key: ZOOKEEPER-442
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-442
>             Project: ZooKeeper
>          Issue Type: Improvement
>            Reporter: Benjamin Reed
>            Priority: Critical
>
> currently the only way a watch cleared is to trigger it. we need a way to enumerate the
outstanding watch objects, find watch events the objects are watching for, and remove interests
in an event.

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