Github user jinxing64 commented on the issue:

    https://github.com/apache/spark/pull/18388
  
    @tgravescs 
    Thanks for help.
     > I think we should expand the description of the config to say what 
happens when the limit is hit. Since its not using real flow control a user 
might set this thinking nothing bad will happen, but its dropping connections 
so could cause failures if the retries don't work.
    
    Could you give the link for the JIRA ? I'm happy to work on a follow-up PR 
if possible.
    
    For the flow control part, I'm just worrying the queue will be too large 
and causing memory issue.


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