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

    https://github.com/apache/spark/pull/16346#discussion_r93681435
  
    --- Diff: 
core/src/main/scala/org/apache/spark/scheduler/BlacklistTracker.scala ---
    @@ -48,9 +48,14 @@ import org.apache.spark.util.{Clock, SystemClock, Utils}
      * one exception is [[nodeBlacklist()]], which can be called without 
holding a lock.
      */
     private[scheduler] class BlacklistTracker (
    +    private val listenerBus: LiveListenerBus,
         conf: SparkConf,
         clock: Clock = new SystemClock()) extends Logging {
     
    +  def this(sc: SparkContext) = {
    +    this(sc.listenerBus, sc.getConf)
    --- End diff --
    
    Probably ok to use `sc.conf` here to avoid another copy of the conf 
instance.


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