Github user ravipesala commented on the issue:
https://github.com/apache/carbondata/pull/978
@watermen Thank you for giving reproduce steps, I can reproduce it.
But the fix you have given is not right, This issue happens because of
missing `semaphore.acquire()` in `finish` method.
So solution is just adding 'semaphore.acquire()' in starting of `finish()`
method solves the issue. Please update the PR.
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