Github user JoshRosen commented on a diff in the pull request:

    https://github.com/apache/spark/pull/8763#discussion_r39570540
  
    --- Diff: core/src/main/scala/org/apache/spark/rdd/NewHadoopRDD.scala ---
    @@ -230,12 +251,16 @@ class NewHadoopRDD[K, V](
         super.persist(storageLevel)
       }
     
    -
    -  def getConf: Configuration = confBroadcast.value.value
    --- End diff --
    
    `HadoopRDD.getConf()` currently returns a new Configuration instance on 
each call, so maybe it's fine to make this change; I'd be very surprised if 
anyone was relying on this confusing undocumented behavior.


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