Chaoyu Tang updated HIVE-14799:
    Attachment: HIVE-14799-branch-2.1.patch

Attach the patch for 2.1.

> 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-branch-2.1.patch, HIVE-14799.1.patch, 
> HIVE-14799.2.patch, HIVE-14799.3.patch, HIVE-14799.4.patch, 
> HIVE-14799.5.patch, HIVE-14799.5.patch, HIVE-14799.6.patch, 
> HIVE-14799.6.patch, HIVE-14799.7.patch, 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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