Github user sryza commented on a diff in the pull request:
https://github.com/apache/spark/pull/5074#discussion_r26790878
--- Diff: docs/programming-guide.md ---
@@ -1086,6 +1086,29 @@ for details.
</tr>
</table>
+### Shuffle operations
+
+Certain operations within Spark trigger an operation known as the shuffle.
The shuffle is Spark's mechanism for re-distributing data so that is grouped
differently across partitions. This typically involves re-arranging and copying
data across executors and machines, making shuffle a complex and costly
operation.
--- End diff --
I would replace uses of "operation" that don't refer to actions or
transformations to avoid confusion.
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