Github user pwendell commented on a diff in the pull request:
https://github.com/apache/spark/pull/4821#discussion_r25574126
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/SparkListener.scala ---
@@ -99,6 +99,12 @@ case class SparkListenerExecutorRemoved(time: Long,
executorId: String, reason:
extends SparkListenerEvent
/**
+ * A special dummy event used to identify the metadata header in event
logs.
+ * This is not actually posted anywhere.
+ */
+private[spark] case object SparkListenerMetadataIdentifier extends
SparkListenerEvent
--- End diff --
Since this is never used, why don't we instead just ignore this event type
when reading from JSON (i.e. allow sparkEventFromJson to return None). It seems
a bit strange to add this event but it contains nothing that's ever used.
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