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

    https://github.com/apache/spark/pull/16346#discussion_r93683196
  
    --- Diff: 
core/src/test/scala/org/apache/spark/scheduler/BlacklistTrackerSuite.scala ---
    @@ -40,7 +41,7 @@ class BlacklistTrackerSuite extends SparkFunSuite with 
BeforeAndAfterEach with M
         scheduler = mockTaskSchedWithConf(conf)
     
         clock.setTime(0)
    -    blacklist = new BlacklistTracker(conf, clock)
    +    blacklist = new BlacklistTracker(null, conf, clock)
    --- End diff --
    
    If this tracker is ever used, won't you get NPEs because the listener bus 
is null?
    
    This basically means you're forcing every test to call 
`configureBlacklistAndScheduler()` manually. So either remove this 
initialization, or do this properly, and just call 
`configureBlacklistAndScheduler()` for tests that need to override the default 
config.
    
    Since I don't see any test actually passing any custom config parameters, 
might as well do the initialization properly here and get rid of 
`configureBlacklistAndScheduler()` altogether.


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