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https://issues.apache.org/jira/browse/HIVE-4628?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13670468#comment-13670468
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Thejas M Nair commented on HIVE-4628:
-------------------------------------
Are you talking about handleToSession in SessionManager ? There is a
"synchronized(sessionMapLock) " block around access to it.
> HS2 sessionmanager should synchronize the call to insert/remove session
> objects from session hash map
> -----------------------------------------------------------------------------------------------------
>
> Key: HIVE-4628
> URL: https://issues.apache.org/jira/browse/HIVE-4628
> Project: Hive
> Issue Type: Bug
> Components: HiveServer2
> Affects Versions: 0.11.0
> Reporter: Shreepadma Venugopalan
> Assignee: Shreepadma Venugopalan
> Priority: Critical
>
> HS2 SessionManager maintains a hashmap of active HS2 sessions. However,
> insert and deletes to this hashmap is not synchronized. A consequence of this
> is a racing thread could overwrite a valid session object in the hashmap and
> we could end up losing a session!
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