[jira] [Commented] (ZOOKEEPER-723) ephemeral parent znodes

["Jakub Lekstan (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-723?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13152805#comment-13152805 ] 

Jakub Lekstan commented on ZOOKEEPER-723:
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Sorry but I don't like this solution. IMO ephemeral nodes have to be deleted on session expire, otherwise we lose consistency.

What I suggest is to allow ephemeral znodes to be parents.
Why would you want to have pseudo ephemeral znodes which don't get deleted after session expire?
                
> ephemeral parent znodes
> -----------------------
>
>                 Key: ZOOKEEPER-723
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-723
>             Project: ZooKeeper
>          Issue Type: New Feature
>          Components: server
>            Reporter: Benjamin Reed
>            Assignee: Daniel Gómez Ferro
>         Attachments: ZOOKEEPER-723.patch, ZOOKEEPER-723.patch
>
>
> ephemeral znodes have the nice property of automatically cleaning up after themselves when the creator goes away, but since they can't have children it is hard to build subtrees that will cleanup after the clients that are using them are gone.
> rather than changing the semantics of ephemeral nodes, i propose ephemeral parents: znodes that disappear when they have no more children. this cleanup would happen automatically when the last child is removed. an ephemeral parent is not tied to any particular session, so even if the creator goes away, the ephemeral parent will remain as long as there are children.
> the when an ephemeral parent is created it will have an initial child, so that it doesn't get immediately removed. i think this child should be an ephemeral znode with a predefined name, "firstChild".

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