[GitHub] spark pull request #18427: [SPARK-21219][Core] Task retry occurs on same exe...

[jiangxb1987 <gi...@git.apache.org>]

Github user jiangxb1987 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/18427#discussion_r125950927
  
    --- 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 --
    
    Why are we using `SystemClock` for `taskSetManager`?


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