Remove unused hasPendingTasks methods

core/src/main/scala/org/apache/spark/scheduler/Pool.scala

@@ -117,8 +117,4 @@ private[spark] class Pool(
       parent.decreaseRunningTasks(taskNum)
     }
   }
-
-  override def hasPendingTasks(): Boolean = {
-    schedulableQueue.exists(_.hasPendingTasks())
-  }
 }

core/src/main/scala/org/apache/spark/scheduler/Schedulable.scala

@@ -42,5 +42,4 @@ private[spark] trait Schedulable {
   def executorLost(executorId: String, host: String): Unit
   def checkSpeculatableTasks(): Boolean
   def getSortedTaskSetQueue(): ArrayBuffer[TaskSetManager]
-  def hasPendingTasks(): Boolean
 }

core/src/main/scala/org/apache/spark/scheduler/TaskSchedulerImpl.scala

@@ -365,13 +365,6 @@ private[spark] class TaskSchedulerImpl(
     }
   }
 
-  // Check for pending tasks in all our active jobs.
-  def hasPendingTasks: Boolean = {
-    synchronized {
-      rootPool.hasPendingTasks()
-    }
-  }
-
   def executorLost(executorId: String, reason: ExecutorLossReason) {
     var failedExecutor: Option[String] = None
 

core/src/main/scala/org/apache/spark/scheduler/TaskSetManager.scala

@@ -681,10 +681,6 @@ private[spark] class TaskSetManager(
     return foundTasks
   }
 
-  override def hasPendingTasks(): Boolean = {
-    numTasks > 0 && tasksSuccessful < numTasks
-  }
-
   private def getLocalityWait(level: TaskLocality.TaskLocality): Long = {
     val defaultWait = System.getProperty("spark.locality.wait", "3000")
     level match {