Github user JeetKunDoug commented on the issue:
https://github.com/apache/spark/pull/21322
@cloud-fan I added the above-mentioned check for `isBroadcast` and only
release resources if it's a broadcast ID. This will affect the MapOutputTracker
as well, but I think it's a pretty limited change and should work well. If
you're not crazy about that, I can start at `Broadcast.destroy` and pass down a
flag to control the behavior, but it's a much more invasive (but doable) change.
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