Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/4029#discussion_r22963362
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/SparkListener.scala ---
@@ -58,6 +58,7 @@ case class SparkListenerTaskEnd(
@DeveloperApi
case class SparkListenerJobStart(
jobId: Int,
+ time: Option[Long],
--- End diff --
I guess this is an option for backwards-compatibility reasons? We
definitely know the time when posting this event to the listener bus, so I
think the right approach is to have time just be a regular `Long` and pass a
dummy value (`-1`) when replaying JSON that's missing that field.
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