Github user ankurdave commented on the pull request:
https://github.com/apache/spark/pull/4234#issuecomment-71953568
@srowen Caching here is necessary since we do reuse some uncached datasets,
so I don't think there's a good solution for uncaching in this kind of
situation.
Ideally Spark would handle this by refcounting RDDs, but the best we can do
for now is probably to force materialization as PageRank and Pregel do.
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