Github user nchammas commented on the pull request:
https://github.com/apache/spark/pull/2083#issuecomment-54105091
> our shuffle operations shouldn't make guarantees about a specific order
(unless you are explicitly calling sortByKey)
As an aside, this matches the semantics of SQL. The only thing that
_guarantees_ a certain order in SQL is an explicit call to `ORDER BY`; tables
are unordered sets of rows; etc.
I think it makes sense to have these RDD operations follow similar
semantics.
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