Github user ericvandenbergfb commented on a diff in the pull request: https://github.com/apache/spark/pull/18427#discussion_r126228623 --- Diff: core/src/test/scala/org/apache/spark/scheduler/TaskSetManagerSuite.scala --- @@ -1172,6 +1172,50 @@ class TaskSetManagerSuite extends SparkFunSuite with LocalSparkContext with Logg assert(blacklistTracker.isNodeBlacklisted("host1")) } + test("update blacklist before adding pending task to avoid race condition") { + // When a task fails, it should apply the blacklist policy prior to + // retrying the task otherwise there's a race condition where run on + // the same executor that it was intended to be black listed from. + val conf = new SparkConf(). + set(config.BLACKLIST_ENABLED, true). + set(config.MAX_TASK_ATTEMPTS_PER_EXECUTOR, 1) + + // Create a task with two executors. + sc = new SparkContext("local", "test", conf) + val exec = "executor1" + val host = "host1" + val exec2 = "executor2" + val host2 = "host2" + sched = new FakeTaskScheduler(sc, (exec, host), (exec2, host2)) + val taskSet = FakeTask.createTaskSet(1) + + val clock = new ManualClock + val mockListenerBus = mock(classOf[LiveListenerBus]) + val blacklistTracker = new BlacklistTracker(mockListenerBus, conf, None, clock) + val taskSetManager = new TaskSetManager(sched, taskSet, 1, Some(blacklistTracker)) --- End diff -- It seems all the tests in this file are using ManualClock so was following convention here. This test doesn't validate anything specifically dependent on the clock/time.
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