Github user mateiz commented on a diff in the pull request:
https://github.com/apache/spark/pull/2508#discussion_r18012607
--- Diff: docs/programming-guide.md ---
@@ -882,7 +882,11 @@ for details.
</tr>
<tr>
<td> <b>groupByKey</b>([<i>numTasks</i>]) </td>
- <td> When called on a dataset of (K, V) pairs, returns a dataset of (K,
Iterable<V>) pairs. <br />
+ <td> When called on a dataset of (K, V) pairs, returns a dataset of (K,
Iterable<V>) pairs.
+ <br />
+ <b>Note:</b> The ordering of elements within each group is not
guaranteed, and may even differ
+ each time the resulting RDD is evaluated.
--- End diff --
I don't think this is a good place to put this in the programming guide. If
you can't find another place, maybe just leave it out. The other note here is a
much more important and more common pitfall.
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