Github user davies commented on the pull request:
https://github.com/apache/spark/pull/8511#issuecomment-136432664
@andrewor14 I think getNarrowAncestors will not traverse the entire
lineage, it only visit the RDDs within the current stage. It still not cheap if
the RDD is an union of thousands RDDs.
We could rollback to use `children` to address you concern, it also work
for SMJ and SMOJ, but could fail on others (like FULL OUTER JOIN(AGG(A),
AGG(B)). Does this work for you?
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