Minwoo Kang created ZOOKEEPER-4979:
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Summary: Provide Metric for Maximum Ephemeral Node Path Length per
Session
Key: ZOOKEEPER-4979
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-4979
Project: ZooKeeper
Issue Type: Improvement
Reporter: Minwoo Kang
h4. Background
Currently, ZooKeeper handles the deletion of ephemeral nodes on closeSession by
processing a session-based delete transaction, rather than creating a separate
delete transaction for each znode.
If a session with a large number of ephemeral nodes is closed, the resulting
transaction can exceed the jute.maxbuffer limit, causing errors.
h4. Problem
* When closing sessions with many ephemeral nodes, the delete transaction size
may exceed {{{}jute.maxbuffer{}}}, resulting in "unreasonable length" errors
and potential ZooKeeper failures.
* ZooKeeper currently provides metrics for the number and size of ephemeral
nodes, but does not provide metrics for the total path length of ephemeral
nodes created by each session.
* As a result, operators have difficulty estimating an appropriate value for
{{jute.maxbuffer}} and cannot proactively monitor for related issues.
h4. Improvement Suggestion
* Provide a metric for the total path length of ephemeral nodes created by
each session.
* It is not necessary to provide this information for all sessions; reporting
only the session with the largest total path length would be sufficient.
* This metric would help operators determine a reasonable value for
jute.maxbuffer and prevent related failures.
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