gengliangwang commented on a change in pull request #32381:
URL: https://github.com/apache/spark/pull/32381#discussion_r627534327



##########
File path: core/src/main/scala/org/apache/spark/ui/jobs/AllJobsPage.scala
##########
@@ -192,6 +201,32 @@ private[ui] class AllJobsPage(parent: JobsTab, store: 
AppStatusStore) extends We
       </a>
     </span> ++
     <div id="application-timeline" class="collapsed">
+      {
+        if (MAX_TIMELINE_JOBS < jobs.size) {
+          <div>
+            <strong>
+              This page has more than the maximum number of jobs that can be 
shown in the
+              visualization! Only the most recent {MAX_TIMELINE_JOBS} 
submitted/completed jobs
+              (of {jobs.size} total) are shown.

Review comment:
       Nit: how about just
   ```
   Only the most recent {MAX_TIMELINE_JOBS} submitted jobs(of {jobs.size} 
total) are shown. 
   ```
   The sentence 
   ```
   This page has more than the maximum number of jobs that can be shown in the 
...
   ```
   seems redundant.
   Not sure whether we should hint the user to tune the configuration.




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