[SPARK-6640][Core] Fix the race condition of creating HeartbeatReceiver and retrieving HeartbeatReceiver

core/src/main/scala/org/apache/spark/HeartbeatReceiver.scala

@@ -37,16 +37,20 @@ private[spark] case class Heartbeat(
     taskMetrics: Array[(Long, TaskMetrics)], // taskId -> TaskMetrics
     blockManagerId: BlockManagerId)
 
+private[spark] case class RegisterTaskScheduler(scheduler: TaskScheduler)
+
 private[spark] case object ExpireDeadHosts 
 
 private[spark] case class HeartbeatResponse(reregisterBlockManager: Boolean)
 
 /**
  * Lives in the driver to receive heartbeats from executors..
  */
-private[spark] class HeartbeatReceiver(sc: SparkContext, scheduler: TaskScheduler)
+private[spark] class HeartbeatReceiver(sc: SparkContext)
   extends Actor with ActorLogReceive with Logging {
 
+  private var scheduler: TaskScheduler = null
+
   // executor ID -> timestamp of when the last heartbeat from this executor was received
   private val executorLastSeen = new mutable.HashMap[String, Long]
 
@@ -71,12 +75,22 @@ private[spark] class HeartbeatReceiver(sc: SparkContext, scheduler: TaskSchedule
   }
 
   override def receiveWithLogging: PartialFunction[Any, Unit] = {
-    case Heartbeat(executorId, taskMetrics, blockManagerId) =>
-      val unknownExecutor = !scheduler.executorHeartbeatReceived(
-        executorId, taskMetrics, blockManagerId)
-      val response = HeartbeatResponse(reregisterBlockManager = unknownExecutor)
-      executorLastSeen(executorId) = System.currentTimeMillis()
-      sender ! response
+    case RegisterTaskScheduler(scheduler) =>
+      this.scheduler = scheduler
+    case heartbeat @ Heartbeat(executorId, taskMetrics, blockManagerId) =>
+      if (scheduler != null) {
+        val unknownExecutor = !scheduler.executorHeartbeatReceived(
+          executorId, taskMetrics, blockManagerId)
+        val response = HeartbeatResponse(reregisterBlockManager = unknownExecutor)
+        executorLastSeen(executorId) = System.currentTimeMillis()
+        sender ! response
+      } else {
+        // Because Executor will sleep several seconds then send the first "Heartbeat", this case
+        // rarely happens. However, if it really happens, log it and ask the executor to register
+        // itself again.
+        logWarning(s"Dropping $heartbeat because TaskScheduler has not been ready yet")
+        sender ! HeartbeatResponse(reregisterBlockManager = true)
+      }
     case ExpireDeadHosts =>
       expireDeadHosts()
   }

core/src/main/scala/org/apache/spark/SparkContext.scala

@@ -356,11 +356,17 @@ class SparkContext(config: SparkConf) extends Logging with ExecutorAllocationCli
   val sparkUser = Utils.getCurrentUserName()
   executorEnvs("SPARK_USER") = sparkUser
 
+  // We need to register "HeartbeatReceiver" before "createTaskScheduler" because Executor will
+  // retrieve "HeartbeatReceiver" in the constructor.
+  private val heartbeatReceiver = env.actorSystem.actorOf(
+    Props(new HeartbeatReceiver(this)), "HeartbeatReceiver")
+
   // Create and start the scheduler
   private[spark] var (schedulerBackend, taskScheduler) =
     SparkContext.createTaskScheduler(this, master)
-  private val heartbeatReceiver = env.actorSystem.actorOf(
-    Props(new HeartbeatReceiver(this, taskScheduler)), "HeartbeatReceiver")
+
+  heartbeatReceiver ! RegisterTaskScheduler(taskScheduler)
+
   @volatile private[spark] var dagScheduler: DAGScheduler = _
   try {
     dagScheduler = new DAGScheduler(this)