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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