bereng commented on pull request #835:
URL: https://github.com/apache/cassandra/pull/835#issuecomment-734330166


   You can have someone assume an idempotent `close()` and for some weird 
reason it gets called multiple times just as you found. Also in between those 
calls the env might have changed enough later calls succeed.
   
   In any case I don't have a strong position here, just trying to future proof 
it. Feel free to ignore it.


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