Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/2347#issuecomment-55374976
@davies It is hard to tell whether we already have fast access to the input
RDD. Force caching may cause problems, e.g.,
1. kicking out some cached RDDs,
2. using too much memory if the input data is large but it could be
generated from a small RDD.
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