Camille Fournier created ZOOKEEPER-2169:
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Summary: Enable creation of nodes with TTLs
Key: ZOOKEEPER-2169
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2169
Project: ZooKeeper
Issue Type: New Feature
Components: c client, java client, jute, server
Affects Versions: 3.6.0
Reporter: Camille Fournier
Fix For: 3.6.0
As a user, I would like to be able to create a node that is NOT tied to a
session but that WILL expire automatically if action is not taken by some
client within a time window.
I propose this to enable clients interacting with ZK via http or other "thin
clients" to create ephemeral-like nodes.
Some ideas for the design, up for discussion:
The node should support all normal ZK node operations including ACLs,
sequential key generation, etc, however, it should not support the ephemeral
flag. The node will be created with a TTL that is updated via a refresh
operation.
The ZK quorum will watch this node similarly to the way that it watches for
session liveness; if the node is not refreshed within the TTL, it will expire.
QUESTIONS:
1) Should we let the refresh operation set the TTL to a different base value?
2) If so, should the setting of the TTL to a new base value cause a watch to
fire?
3) Do we want to allow these nodes to have children or prevent this similar to
ephemeral nodes?
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