Github user esjewett commented on the pull request:
https://github.com/apache/spark/pull/668#issuecomment-42345721
@pwendell I like your wording. Switched to use it, and moved it to the end
of the "RDD Persistence" section as requested. I also updated the "RDD
Operations" section with a small change so as not to imply that RDDs that
aren't persist()ed will always be reprocessed.
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