Allow ephemeral znodes to have children created only by the owner session.
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Key: ZOOKEEPER-834
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-834
Project: Zookeeper
Issue Type: New Feature
Components: c client, java client, server
Reporter: Andrei Savu
Fix For: 3.4.0
Ephemeral znodes are automatically removed when the client session is closed or
expires and this behavior makes them very useful when you want to publish
status information from active / connected clients.
But there is a catch. Right now ephemerals can't have children znodes and
because of that clients need to serialize status information as byte strings.
This serialization renders that information almost invisible to generic
zookeeper clients and hard / inefficient to update.
Most of the time the status information can be expressed as a bunch of (key,
value) pairs and we could easily store that using child znodes. Any ZooKeeper
client can read that info without the need to reverse the serialization process
and we can also easily update it.
I suggest that the server should allow the ephemeral znodes to have children
znodes. Each child should also be an ephemeral znode owned by the same session
- parent ephemeralOwner session.
Mail Archive:
http://www.mail-archive.com/zookeeper-dev@hadoop.apache.org/msg09819.html
Another discussion about the same topic:
http://www.mail-archive.com/zookeeper-dev@hadoop.apache.org/msg08165.html
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