Github user gengliangwang commented on a diff in the pull request: https://github.com/apache/spark/pull/22883#discussion_r229535706 --- Diff: core/src/main/scala/org/apache/spark/status/AppStatusListener.scala --- @@ -1105,6 +1095,15 @@ private[spark] class AppStatusListener( cleanupCachedQuantiles(key) } + + // Delete tasks for all stages in one pass, as deleting them for each stage individually is slow --- End diff -- Hi @patrickbrownsync , can you explain more about why deleting them in the loop above is slower? I don't quite understand it.
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