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

    https://github.com/apache/spark/pull/19272#discussion_r148341472
  
    --- Diff: 
core/src/main/scala/org/apache/spark/scheduler/cluster/CoarseGrainedSchedulerBackend.scala
 ---
    @@ -102,8 +99,15 @@ class CoarseGrainedSchedulerBackend(scheduler: 
TaskSchedulerImpl, val rpcEnv: Rp
       // hadoop token manager used by some sub-classes (e.g. Mesos)
       def hadoopDelegationTokenManager: Option[HadoopDelegationTokenManager] = 
None
     
    -  // Hadoop delegation tokens to be sent to the executors.
    -  val hadoopDelegationCreds: Option[Array[Byte]] = 
getHadoopDelegationCreds()
    +  def hadoopCredentialRenewer: Option[HadoopCredentialRenewer] = None
    --- End diff --
    
    Why is this needed here? This class doesn't use it at all.


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