Github user vanzin commented on a diff in the pull request: https://github.com/apache/spark/pull/18253#discussion_r130759258 --- Diff: core/src/main/scala/org/apache/spark/SparkContext.scala --- @@ -2379,8 +2382,13 @@ class SparkContext(config: SparkConf) extends Logging { " parameter from breaking Spark's ability to find a valid constructor.") } } - listenerBus.addListener(listener) - logInfo(s"Registered listener $className") + logInfo(s"listener $className created") + listener + } + if (extraListeners.nonEmpty) { + val group = new FixGroupOfListener(extraListeners, "extraListeners") --- End diff -- > First, I think that modifying the existing addListener method is a bad idea. It will impact a lot the code. That's why overloaded methods exist. > But I have 2 kind of group of listeners I don't think there's really a distinction between the two types of groups you mention. The "UI group" is just a modifiable group that you don't modify after it's been created.
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