Github user jerryshao commented on a diff in the pull request:
https://github.com/apache/spark/pull/19132#discussion_r138240053
--- Diff: core/src/main/scala/org/apache/spark/ui/SparkUI.scala ---
@@ -50,6 +50,7 @@ private[spark] class SparkUI private (
val operationGraphListener: RDDOperationGraphListener,
var appName: String,
val basePath: String,
+ val lastUpdateTime: Long = -1L,
--- End diff --
I would like to user `Option[Long] = None` as default value to reflect
there's no update time.
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