Github user JoshRosen commented on the pull request:

    https://github.com/apache/spark/pull/3009#issuecomment-63371456
  
    > The only other issue is something we discussed earlier, which is what 
happens if a map stage has to be recomputed due to a fetch failure? Do you end 
up with more complete stages than stages in the job?
    
    I'd like to add a Selenium test for this.  It looks like I should be able 
to simulate a fetch failure by throwing `FetchFailedException` from a `map()` 
task.  Do you know if there's an easy way to get a shuffleId and mapId from 
inside of a `map()` UDF?  If not, is there an easier way to simulate fetch 
failures for UI testing?


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