Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/11257#issuecomment-187827789
Another way to avoid blocking in `finalize` is to not do the work in the
finalizer. It's as simple as making an idempotent "close" or "cleanup" method
that does nothing if it has already been disposed. ... are these broadcasts not
otherwise cleaned up?
To the extent they're rarely used, is this a problem?
My concern is that you're simply reimplementing a separate 'finalizer'
queue with all the associated complexity.
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