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https://issues.apache.org/jira/browse/HIVE-15764?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15847327#comment-15847327
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Sergey Shelukhin commented on HIVE-15764:
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Dunno. Is there still a scenario where session from TezTask would not be
released otherwise?
> Tez session doesn't get released TezSessionPool on query cancellation
> ---------------------------------------------------------------------
>
> Key: HIVE-15764
> URL: https://issues.apache.org/jira/browse/HIVE-15764
> Project: Hive
> Issue Type: Bug
> Components: Tez
> Affects Versions: 1.2.1, 2.1.1
> Reporter: Thejas M Nair
> Assignee: Thejas M Nair
> Attachments: HIVE-15764.1.patch
>
>
> With HiveServer2, tez execution engine, and
> hive.server2.tez.initialize.default.sessions=true, if a query is cancelled
> via jdbc, the tez session doesn't get released back to the session pool.
> This can cause the query processing of new queries to get stuck, waiting for
> a tez session to be available.
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