Github user devaraj-kavali commented on a diff in the pull request:
https://github.com/apache/spark/pull/11996#discussion_r58563479
--- Diff:
core/src/test/scala/org/apache/spark/scheduler/TaskSetManagerSuite.scala ---
@@ -789,6 +791,51 @@ class TaskSetManagerSuite extends SparkFunSuite with
LocalSparkContext with Logg
assert(TaskLocation("executor_host1_3") ===
ExecutorCacheTaskLocation("host1", "3"))
}
+ test("Kill other task attempts when one attempt belonging to the same
task succeeds") {
+ sc = new SparkContext("local", "test")
+ val sched = new FakeTaskScheduler(sc, ("exec1", "host1"), ("exec2",
"host2"))
+ val taskSet = FakeTask.createTaskSet(4)
+ val manager = new TaskSetManager(sched, taskSet, MAX_TASK_FAILURES)
+ val accumUpdatesByTask: Array[Seq[AccumulableInfo]] =
taskSet.tasks.map { task =>
+ task.initialAccumulators.map { a => a.toInfo(Some(0L), None) }
+ }
+ // Offer resources for 4 tasks to start
+ for ((k, v) <- List(
+ "exec1" -> "host1",
+ "exec1" -> "host1",
+ "exec2" -> "host2",
+ "exec2" -> "host2")) {
+ val taskOption = manager.resourceOffer(k, v, NO_PREF)
+ assert(taskOption.isDefined)
+ val task = taskOption.get
+ assert(task.executorId === k)
+ }
+ assert(sched.startedTasks.toSet === Set(0, 1, 2, 3))
+ // Complete the 3 tasks and leave 1 task in running
+ for (id <- Set(0, 1, 2)) {
+ manager.handleSuccessfulTask(id, createTaskResult(id,
accumUpdatesByTask(id)))
+ assert(sched.endedTasks(id) === Success)
+ }
+
+ // Wait for the threshold time to start speculative attempt for the
running task
+ Thread.sleep(100)
--- End diff --
Thanks @tgravescs for your quick response.
Here Thread.sleep(100) is to match the threshold value mentioned in
TaskSetManager.checkSpeculatableTasks(). It is the minimum time where the task
needs to run for this much of time before becoming eligible for launching a
speculative attempt. I don't see any way to change this default value.
> val medianDuration = durations(min((0.5 * tasksSuccessful).round.toInt,
durations.length - 1))
> val threshold = max(SPECULATION_MULTIPLIER * medianDuration, 100)
>
I don't think this threshold value is related to the config
âspark.speculation.intervalâ here.
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