Github user kayousterhout commented on the issue:

    https://github.com/apache/spark/pull/16639
  
    Ok I'm convinced re: not walking up the cause tree.  I didn't think about 
that finally case.  I'll do another review now.
    
    Re: larger integration test, I didn't have a particular thing in mind -- I 
was mentioning that in response to your comment at it was hard to trigger the 
failure because of that first set of blocks that's fetched before any next() 
calls (so I was hoping you had some integration test in mind that would 
leverage that).   But fine not to have one if it's still too complex to do.


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