Github user zsxwing commented on the pull request:
https://github.com/apache/spark/pull/11257#issuecomment-187554081
> @zsxwing when the queue is empty? Add a listener to the queue to invoke
or stop the thread accordingly? Would this approach still make Phantom
reference more beneficial than finalize()?
Right. I'm thinking about it. Actually, it looks much more complicated than
it was thought. Maybe let's just leave it until someone complaints the bad
performance.
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