Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/4777#discussion_r25485191
--- 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 --
should this return some page with an error message?
```
val content = // some HTML
UIUtils.basicSparkPage(content, "Application not found")
```
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