Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/5306#discussion_r27713951
--- Diff: core/src/main/scala/org/apache/spark/HeartbeatReceiver.scala ---
@@ -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")
--- End diff --
is not ready yet
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