Github user srowen commented on the pull request:

    https://github.com/apache/spark/pull/5354#issuecomment-94191765
  
    That sure looks cleaner. Although updating the HTTP client version has some 
implications across the code base -- we need to see if we harmonize correctly 
on this version and look at the list of changes to decide whether there are 
possible conflicts -- I suspect that can be OK and that it helps more than 
hurts.
    
    Still on Jackson: is it that you want to standardize on a certain version? 
what version? managing the version is a more robust way to do this.
    
    (Reminds me: separately, I should figure out whether we can pull up all of 
these messy exclusions into the parent. They shouldn't go in the child POMs.)
    
    Does the new release of Tachyon remove some dependencies? that is, it's 
great that almost all the exclusions are gone, but that doesn't mean that this 
now brings in more dependencies does it? Jenkins will tell us ---


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