srowen commented on pull request #28769:
URL: https://github.com/apache/spark/pull/28769#issuecomment-641636134


   I think this 'works', though I do wonder how many iterators are open at 
once. It can't be like thousands, right?
   
   I guess we don't otherwise have a guess about what is leaking iterators? if 
they were reliably closed this wouldn't be a big deal, right


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