Github user jinxing64 commented on the issue: https://github.com/apache/spark/pull/16620 As @squito mentioned: >Before this, the DAGScheduler didn't really know anything about taskSetManagers. (In its current form, this pr uses a "leaked" handle via rootPool.getSortedTaskSetQueue). Is adding it here a mistake? An alternative would be to add a method to TaskScheduler like markTaskSetsForStageAsZombie(stageId: Int). But that is still basically exposing the idea of "zombie" tasksets to the dagscheduler, I dunno if its actually any cleaner. I think this a cleaner and simpler way for fixing this bug. And we can avoid adding TSM info to the DAGScheduler.
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