Github user steveloughran commented on the pull request:

    https://github.com/apache/spark/pull/10821#issuecomment-196426595
  
    I'm not sure how that crept in on the patch; it wasn't something 
intentional.
    
    1. It is needed for the spark timeline stuff —but that can be handled in 
history load code of the `YarnHistoryProvider`
    1. Having a simple "1", "2", is actually useful, especially in the REST 
API; you don't need to know the attempt Id to know that /1 is for the first 
attempt; /2 for the second
    1. Really to test link validity there should be something in the web UI, 
though being JSON that's too complex now. Hitting the REST API should suffice


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