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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