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

    https://github.com/apache/spark/pull/18427#discussion_r126228249
  
    --- 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)
    --- End diff --
    
    Yes, I added it to make the test code (configuration) inputs more explicit, 
but I can remove if it's a default unlikely to change. 


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