Github user JoshRosen commented on the issue:

    https://github.com/apache/spark/pull/18083
  
    Context for review: a large portion of the diff in this patch was undoing 
changes to the LiveListenerBus constructor and `start()` method which were 
introduced in #14269. That patch introduced a bunch of weird implicit 
initialization order constraints in the form of `lazy val`s which was 
complicating using those values in metrics gauges. See my comments over on that 
other PR for more details.


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