Fangmin Lv created ZOOKEEPER-3471:
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Summary: Potential lock unavailable due to dangling ephemeral
nodes left during local session upgrading
Key: ZOOKEEPER-3471
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3471
Project: ZooKeeper
Issue Type: Bug
Components: server
Affects Versions: 3.6.0
Reporter: Fangmin Lv
Assignee: Fangmin Lv
Fix For: 3.6.0
There is a race condition which might be triggered if the client create
session, upgrading the session with ephemeral node, then immediately issued
close session request before it's removed from local session tracker.
The close session request will be treated as a local session close request
since it still exists in the local session tracker, which goes through the ZK
pipeline and delete the session from both local and global session tracker.
Since the session is not tracked anymore, it will leave the ephemeral nodes
there.
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