Chaoyu Tang created HIVE-14799:

             Summary: Query operation are not thread safe during its 
                 Key: HIVE-14799
             Project: Hive
          Issue Type: Bug
          Components: HiveServer2
            Reporter: Chaoyu Tang
            Assignee: Chaoyu Tang

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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