ephemeral parent znodes
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Key: ZOOKEEPER-723
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-723
Project: Zookeeper
Issue Type: New Feature
Reporter: Benjamin Reed
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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