Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/4777#discussion_r25500809
--- Diff:
core/src/main/scala/org/apache/spark/deploy/master/ui/ApplicationPage.scala ---
@@ -55,6 +60,9 @@ private[spark] class ApplicationPage(parent: MasterWebUI)
extends WebUIPage("app
val app = state.activeApps.find(_.id == appId).getOrElse({
state.completedApps.find(_.id == appId).getOrElse(null)
})
+ if (app == null) {
+ return Seq[Node]()
--- End diff --
Yeah that makes sense. I emulated the message in `HistoryServer`. Really
this should result in an HTTP 404, but this simplified API doesn't give access
to the `HttpServletResponse`. It wouldn't be a lot of work to pass this around
all through the API. Worth it here, you guys think?
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