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https://issues.apache.org/jira/browse/HIVE-14799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15549316#comment-15549316
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Chaoyu Tang commented on HIVE-14799:
------------------------------------
the patch has been uploaded to https://reviews.apache.org/r/52559/ and
requested for review.
> Query operation are not thread safe during its cancellation
> -----------------------------------------------------------
>
> Key: HIVE-14799
> URL: https://issues.apache.org/jira/browse/HIVE-14799
> Project: Hive
> Issue Type: Bug
> Components: HiveServer2
> Reporter: Chaoyu Tang
> Assignee: Chaoyu Tang
> Attachments: HIVE-14799.patch
>
>
> When a query is cancelled either via Beeline (Ctrl-C) or API call
> TCLIService.Client.CancelOperation, SQLOperation.cancel is invoked in a
> different thread from that running the query to close/destroy its
> encapsulated Driver object. Both SQLOperation and Driver are not thread-safe
> which could sometimes result in Runtime exceptions like NPE. The errors from
> the running query are not handled properly therefore probably causing some
> stuffs (files, locks etc) not being cleaned after the query termination.
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