Github user gatorsmile commented on a diff in the pull request:

    https://github.com/apache/spark/pull/18887#discussion_r137942598
  
    --- Diff: 
core/src/main/scala/org/apache/spark/deploy/history/FsHistoryProvider.scala ---
    @@ -229,10 +254,22 @@ private[history] class FsHistoryProvider(conf: 
SparkConf, clock: Clock)
         }
       }
     
    -  override def getListing(): Iterator[FsApplicationHistoryInfo] = 
applications.values.iterator
    +  override def getListing(): Iterator[ApplicationHistoryInfo] = {
    --- End diff --
    
    The returned order is `descending`, right? This is not straightforward from 
the codes. Please add a comment


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