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Posted to issues@zookeeper.apache.org by "Christopher Tubbs (Jira)" <ji...@apache.org> on 2021/03/17 05:29:00 UTC
[jira] [Resolved] (ZOOKEEPER-4256) The same session is obtained at
different times
[ https://issues.apache.org/jira/browse/ZOOKEEPER-4256?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Christopher Tubbs resolved ZOOKEEPER-4256.
------------------------------------------
Resolution: Duplicate
> The same session is obtained at different times
> -----------------------------------------------
>
> Key: ZOOKEEPER-4256
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-4256
> Project: ZooKeeper
> Issue Type: Bug
> Affects Versions: 3.4.13
> Reporter: Damon Liu
> Priority: Major
> Attachments: AA.log, BB.log, zookeeper.log
>
>
> App AA connects to ZooKeeper and creates a temporary path such as /brokers/ids/10. Another APP BB also connects to ZooKeeper. At some point AA BB and ZooKeeper are restarted, and BB allocates AA's old session
> before restart:
> AA connect to zookeeper ,and log in zk:
> [2021-03-07 08:47:43,468] INFO [SyncThread:0] Established session {color:#FF0000}0x10000053ef90000{color} with negotiated timeout 8000 for client /{color:#FF0000}22.20.0.45{color}:59966 (org.apache.zookeeper.server.ZooKeeperServer)
>
> after restart:
> BB connect to zookeeper ,and log in zk:
> [2021-03-07 08:58:51,351] INFO [SyncThread:0] Established session {color:#FF0000}0x10000053ef90000{color} with negotiated timeout 30000 for client /{color:#FF0000}22.20.0.47{color}:39360 (org.apache.zookeeper.server.ZooKeeperServer)
>
> I understand that after a restart, ZooKeeper loads old transaction logs and snapshot files, and old sessions and temporary paths are loaded. If BB obtains the old session 0x10000053ef90000 at this point, the session will not expire and the temporary path will not be deleted, causing AA to be unable to re-register the temporary path
> This is my question. I look forward to your help. Thank you very much!
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