Github user ericl commented on a diff in the pull request:
https://github.com/apache/spark/pull/17166#discussion_r107070597
--- Diff: core/src/test/scala/org/apache/spark/SparkContextSuite.scala ---
@@ -540,6 +540,39 @@ class SparkContextSuite extends SparkFunSuite with
LocalSparkContext with Eventu
}
}
+ // Launches one task that will run forever. Once the SparkListener
detects the task has
+ // started, kill and re-schedule it. The second run of the task will
complete immediately.
+ // If this test times out, then the first version of the task wasn't
killed successfully.
+ test("Killing tasks") {
+ sc = new SparkContext(new
SparkConf().setAppName("test").setMaster("local"))
+
+ SparkContextSuite.isTaskStarted = false
+ SparkContextSuite.taskKilled = false
+
+ val listener = new SparkListener {
+ override def onTaskStart(taskStart: SparkListenerTaskStart): Unit = {
+ eventually(timeout(10.seconds)) {
+ assert(SparkContextSuite.isTaskStarted)
+ }
+ if (!SparkContextSuite.taskKilled) {
+ SparkContextSuite.taskKilled = true
+ sc.killTaskAttempt(taskStart.taskInfo.taskId, true, "first
attempt will hang")
+ }
+ }
+ }
+ sc.addSparkListener(listener)
+ eventually(timeout(20.seconds)) {
+ sc.parallelize(1 to 1).foreach { x =>
+ // first attempt will hang
+ if (!SparkContextSuite.isTaskStarted) {
+ SparkContextSuite.isTaskStarted = true
+ Thread.sleep(9999999)
+ }
+ // second attempt succeeds immediately
+ }
--- End diff --
`foreach` is an action so actually it does run, but I added the
verification just in case.
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