Sergey Shelukhin created HIVE-16778:
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             Summary: LLAP IO: better refcount management I
                 Key: HIVE-16778
                 URL: https://issues.apache.org/jira/browse/HIVE-16778
             Project: Hive
          Issue Type: Bug
            Reporter: Sergey Shelukhin
            Assignee: Sergey Shelukhin


Looks like task cancellation can close the UGI, causing the background thread 
to die with an exception, leaving a bunch of unreleased cache buffers.
Overall, it's probably better to modify how refcounts are handled - if there's 
some bug in the code we don't want to leak them. 



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