Ngone51 commented on a change in pull request #33872:
URL: https://github.com/apache/spark/pull/33872#discussion_r700126164
##########
File path:
core/src/test/scala/org/apache/spark/scheduler/TaskSchedulerImplSuite.scala
##########
@@ -1995,6 +2000,61 @@ class TaskSchedulerImplSuite extends SparkFunSuite with
LocalSparkContext with B
assert(!normalTSM.runningTasksSet.contains(taskId))
}
+ test("SPARK-36575: Executor lost cause task hang") {
+ val taskScheduler = setupScheduler()
+
+ val resultGetter = new TaskResultGetter(sc.env, taskScheduler) {
+ override protected val getTaskResultExecutor: ExecutorService =
+ ThreadUtils.newDaemonFixedThreadPool(1, "task-result-getter")
+ def taskResultExecutor() : ExecutorService = getTaskResultExecutor
+ }
+ taskScheduler.taskResultGetter = resultGetter
+
+ val workerOffers = IndexedSeq(new WorkerOffer("executor0", "host0", 1),
+ new WorkerOffer("executor1", "host1", 1))
+ val task1 = new ShuffleMapTask(1, 0, null, new Partition {
+ override def index: Int = 0
+ }, Seq(TaskLocation("host0", "executor0")), new Properties, null)
+
+ val task2 = new ShuffleMapTask(1, 0, null, new Partition {
+ override def index: Int = 0
+ }, Seq(TaskLocation("host1", "executor1")), new Properties, null)
+
+ val taskSet = new TaskSet(Array(task1, task2), 0, 0, 0, null, 0)
+
+ taskScheduler.submitTasks(taskSet)
+ val taskDescriptions = taskScheduler.resourceOffers(workerOffers).flatten
+ assert(2 === taskDescriptions.length)
+
+ val ser = sc.env.serializer.newInstance()
+ val directResult = new DirectTaskResult[Int](ser.serialize(1), Seq(),
Array.empty)
+ val resultBytes = ser.serialize(directResult)
+
+ // make getTaskResultExecutor busy
+ import scala.language.reflectiveCalls
+ resultGetter.taskResultExecutor().submit( new Runnable {
+ override def run(): Unit = Thread.sleep(100)
+ })
+
+ // task1 finished
+ taskScheduler.statusUpdate(
+ tid = taskDescriptions(0).taskId,
+ state = TaskState.FINISHED,
+ serializedData = resultBytes
+ )
+
+ // mark executor heartbeat timed out
+ taskScheduler.executorLost(taskDescriptions(0).executorId,
ExecutorProcessLost("Executor " +
+ "heartbeat timed out"))
+
+ // Wait a while until all events are processed
+ Thread.sleep(100)
Review comment:
> The issue will cause TaskSetManager.successful wrong result, mark the
partition index true. And TaskSetManager.dequeueTaskFromList only dequeue the
unsuccessful index
(https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/scheduler/TaskSetManager.scala#L313),
so this partition index will be never scheduled again.
As I mentioned, the stage can also complete even if the pending list isn't
empty. The TaskSetManager can still complete as long as `tasksSuccessful ==
numTasks`. I still can't get why it can lead to stage hang.
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