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Posted to dev@zookeeper.apache.org by "Fangmin Lv (JIRA)" <ji...@apache.org> on 2019/07/28 17:51:00 UTC

[jira] [Created] (ZOOKEEPER-3471) Potential lock unavailable due to dangling ephemeral nodes left during local session upgrading

Fangmin Lv created ZOOKEEPER-3471:
-------------------------------------

             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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