Github user holdenk commented on the pull request:
https://github.com/apache/spark/pull/11105#issuecomment-197582718
@squito so I don't really care about a partial partition process - but a
take(1) on a cached RDD for example will fully evaluate one full partition that
won't be re-evaluated by a subsequent action (unless the first partition gets
evicted) and we need to ensure we have the values for all of the partitions.
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