Github user tejasapatil commented on a diff in the pull request:
https://github.com/apache/spark/pull/15226#discussion_r80350179
--- Diff:
core/src/main/scala/org/apache/spark/util/AsynchronousListenerBus.scala ---
@@ -117,6 +124,24 @@ private[spark] abstract class
AsynchronousListenerBus[L <: AnyRef, E](name: Stri
eventLock.release()
} else {
onDropEvent(event)
+ droppedEventsCounter.incrementAndGet()
+ }
+
+ val droppedEvents = droppedEventsCounter.get
+ if (droppedEvents > 0) {
+ // Don't log too frequently
+ if (System.currentTimeMillis() - lastReportTimestamp >= 60 * 1000) {
--- End diff --
Won't nanotime be overkill ? Even if there is a single dropped event, this
check will get executed with every post() so having currentTimeMillis (which is
less costly) is preferable.
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