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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