Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/5074#discussion_r26636796
--- Diff: docs/programming-guide.md ---
@@ -1022,6 +1022,27 @@ 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-organizing data to co-locate data
associated with particular keys.
--- End diff --
maybe something like this?
"shuffle is Spark's mechanism for redistributing data so data of the same
key becomes co-located after shuffle".
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