Github user srowen commented on a diff in the pull request: https://github.com/apache/spark/pull/2055#discussion_r25068858 --- Diff: core/src/main/scala/org/apache/spark/util/ActorLogReceive.scala --- @@ -43,7 +43,13 @@ private[spark] trait ActorLogReceive { private val _receiveWithLogging = receiveWithLogging - override def isDefinedAt(o: Any): Boolean = _receiveWithLogging.isDefinedAt(o) + override def isDefinedAt(o: Any): Boolean = { + val handled = _receiveWithLogging.isDefinedAt(o) + if (!handled) { + log.warn(s"Received unexpected actor system event: $o") --- End diff -- Yes, perhaps at least turn this down to `info`?
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