Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/5416#issuecomment-93177863
Yes, the parent of the second shuffle map stage will be the first shuffle
map stage. Logically every `Stage` except the first one have parents, but the
problem is we always re-calculate it when we need parent stages. So I think
maybe we should change `parents` from a value into a method.
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