Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/5416#issuecomment-90863451
The only place that use `parents` is
[here](https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala#L756-759).
I agree a stage generally-speaking have parents and `parents` belongs to
`Stage` logically, but when we need parent stages, we always re-calculate it.
The code I mentioned before is the only place we use the "cached" parent
stages. Should we put `getParentStages` and some related methods into `Stage`
class? @JoshRosen
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