Github user yhuai commented on the pull request:

    https://github.com/apache/spark/pull/8512#issuecomment-140567731
  
    It will be great if we can have more comments to explain `SparkS3Util`, 
specially those private methods. So, a developer who can quickly understand the 
flow and methods of it by reading the code.
    
    Also, do we need to have two versions of it? One for `mapred` API 
(`HadoopRDD`) and one for `mapreduce` API (`NewHadoopRDD`)? Or, we can have a 
single version that works with both APIs?


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