Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/5416#issuecomment-93061196
@cloud-fan @JoshRosen what happens if I do a back-to-back shuffle like:
```
sc.parallelize(1 to 100).map { i => (i, i)
}.groupByKey(...).reduceByKey(...).count()
```
My understanding is that this will run a shuffle map stage, then another
shuffle map stage, then a reduce stage. It seems to me that the parent of the
second shuffle map stage will be the first shuffle map stage, no?
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