Tao Li commented on HIVE-15002:

[~kgyrtkirk] From the stack trace, I can see a thread waiting for the 
semaphore. I did not see exception thrown when creating the operation. I assume 
you are saying the thread is blocked because of the unreleased lock caused by 
the bug?

> HiveSessionImpl#executeStatementInternal may leave locks in an inconsistent 
> state
> ---------------------------------------------------------------------------------
>                 Key: HIVE-15002
>                 URL: https://issues.apache.org/jira/browse/HIVE-15002
>             Project: Hive
>          Issue Type: Bug
>          Components: HiveServer2
>            Reporter: Zoltan Haindrich
>            Assignee: Zoltan Haindrich
>         Attachments: HIVE-15002.1.patch, stacktrace.txt
> {{TestEmbeddedThriftBinaryCLIService}} have showed me this behaviour.
> Thrift service may hang because of this issue.
> {{TestEmbeddedThriftBinaryCLIService}} can reproduce this problem with a very 
> bad probability...but I was able to 
> Its not able to aquire the semaphore; because most probably because an 
> earlier command have produced an SQLException in the unprotected parts.

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