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https://issues.apache.org/jira/browse/ZOOKEEPER-723?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13049931#comment-13049931
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Patrick Hunt commented on ZOOKEEPER-723:
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Wow, my brain is in an infinite loop now. ;-)
Yes, iirc that's one of the issues we had touched on way back when... and one
of the reasons why we kept it simply that ephemeral nodes couldn't have
children. I seem to also remember another related issue, that once you start
allowing arbitrarily large ephemeral trees to be built there was a concern
about cleanup and it's effect on availability of the system as a whole. (still
a concern I would have)
note: If this znode really is ephemeral (strongly tied to the session lifetime)
I don't have a problem calling it as such. however it the znode can live beyond
the session lifetime that created it then Flavio's suggestion of "solitary"
sounds good to me. (was that a typo or did you really mean solidary?)
> 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
>
>
> 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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