apache/spark — pull request #2508 by srowen (2014-09-23 12:59:05+00:00)
Title: [SPARK-3356] [DOCS] Document when RDD elements' ordering within partitions is nondeterministic

As suggested by @mateiz , and because it came up on the mailing list again last week, this attempts to document that ordering of elements is not guaranteed across RDD evaluations in groupBy, zip, and partition-wise RDD methods. Suggestions welcome about the wording, or other methods that need a note.