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

    https://github.com/apache/spark/pull/8744#discussion_r39676854
  
    --- Diff: 
yarn/src/main/scala/org/apache/spark/scheduler/cluster/YarnClusterSchedulerBackend.scala
 ---
    @@ -37,9 +38,12 @@ private[spark] class YarnClusterSchedulerBackend(
         scheduler: TaskSchedulerImpl,
         sc: SparkContext)
       extends YarnSchedulerBackend(scheduler, sc) {
    +  private val services: YarnExtensionServices = new YarnExtensionServices()
    --- End diff --
    
    It seems like `YarnSchedulerBackend` is only used in the yarn module 
anyway, so it could be moved there. It doesn't really make a lot of sense in 
`core/`.


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