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

    https://github.com/apache/spark/pull/3765#discussion_r22950105
  
    --- Diff: 
yarn/src/main/scala/org/apache/spark/deploy/yarn/YarnAllocator.scala ---
    @@ -62,50 +62,42 @@ private[yarn] class YarnAllocator(
         amClient: AMRMClient[ContainerRequest],
         appAttemptId: ApplicationAttemptId,
         args: ApplicationMasterArguments,
    -    preferredNodes: collection.Map[String, collection.Set[SplitInfo]],
    --- End diff --
    
    This is discussed in the proposal - preferred locality on YARN is currently 
broken for a few other reasons.  The goal here is make the code as simple as 
possible, and we can later add it back in in a way that makes sense for 
SPARK-4352.


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