Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/3936#discussion_r22644880
--- Diff: core/src/main/scala/org/apache/spark/rdd/PairRDDFunctions.scala
---
@@ -437,6 +437,9 @@ class PairRDDFunctions[K, V](self: RDD[(K, V)])
* Note: This operation may be very expensive. If you are grouping in
order to perform an
* aggregation (such as a sum or average) over each key, using
[[PairRDDFunctions.aggregateByKey]]
* or [[PairRDDFunctions.reduceByKey]] will provide much better
performance.
+ *
+ * Note: As currently implemented, GroupByKey must be able to hold all
the key-value pairs for any
--- End diff --
Nit: the method is `groupByKey`
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