Github user Ngone51 commented on a diff in the pull request:
https://github.com/apache/spark/pull/20056#discussion_r158751285
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/LiveListenerBus.scala ---
@@ -25,14 +25,13 @@ import scala.collection.JavaConverters._
import scala.collection.mutable
import scala.reflect.ClassTag
import scala.util.DynamicVariable
-
--- End diff --
> Under what scenario would this metrics be useful?
This a supplyment for uncompleted work of "droppedEventsCounter" (in
LiveListenerBus).
This metrics could let us know the running condition of bus at the level
of LiveListenerBus, rather than multiple AsyncEventQueue separately only.
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