Github user yufan-liu commented on the pull request:
https://github.com/apache/spark/pull/6778#issuecomment-111381881
I just cannot figure out why we should keep the reference of
mapOutputTracker field in the TaskSchedulerImpl. The mapOutputTracker can be
referenced from a global entry point, which is SparkEnv. So obviously, the
TaskSetManager should reference it directly from SparkEnv.
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