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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