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

    https://github.com/apache/spark/pull/13264#discussion_r64446719
  
    --- Diff: core/src/main/scala/org/apache/spark/ui/storage/StorageTab.scala 
---
    @@ -59,7 +59,15 @@ class StorageListener(storageStatusListener: 
StorageStatusListener) extends Bloc
     
       override def onStageSubmitted(stageSubmitted: 
SparkListenerStageSubmitted): Unit = synchronized {
         val rddInfos = stageSubmitted.stageInfo.rddInfos
    -    rddInfos.foreach { info => _rddInfoMap.getOrElseUpdate(info.id, info) }
    +    rddInfos.foreach { info =>
    --- End diff --
    
    It's likely to be slower IMO (as it performs a mutation every time, as 
opposed to only mutating when needed - the modified cache page will need to 
sent back to RAM at some point, resulting in extra traffic on the bus).


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