yaooqinn commented on code in PR #43643:
URL: https://github.com/apache/spark/pull/43643#discussion_r1381201021


##########
core/src/main/scala/org/apache/spark/deploy/master/ui/ApplicationPage.scala:
##########
@@ -98,6 +98,11 @@ private[ui] class ApplicationPage(parent: MasterWebUI) 
extends WebUIPage("app")
                     <a href={UIUtils.makeHref(parent.master.reverseProxy,
                       app.id, app.desc.appUiUrl)}>Application Detail UI</a>
                 </strong></li>
+              } else if (parent.master.historyServerUrl.nonEmpty) {
+                <li><strong>
+                    <a 
href={s"${parent.master.historyServerUrl.get}/history/${app.id}"}>

Review Comment:
   If the user sets a different value for `spark.eventLog.dir` from the default 
value 
    which `spark.ui.historyServerUrl` points to, he/she might get confused 
while not able to find their apps



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