Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/8511#issuecomment-136227633
Hm, my only concern with doing the `getNarrowAncestors` thing in
`ZipPartitionsRDD` is that now everyone who uses it will traverse the entire
lineage. E.g. if GraphX uses `ZipPartitionsRDD` then we might introduce a
regression. I think it's safest if we just do it in the specific operators we
care about, i.e. SMJ / SMOJ (are there any others?).
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