Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/5075#discussion_r26616795
--- Diff: core/src/main/scala/org/apache/spark/rdd/PairRDDFunctions.scala
---
@@ -163,6 +163,38 @@ class PairRDDFunctions[K, V](self: RDD[(K, V)])
}
/**
+ * Returns the top k (largest) elements for each key from this RDD as
defined by the specified
+ * implicit Ordering[T]. This does the opposite of [[takeOrderedByKey]].
--- End diff --
Please document the behavior when there are less than k elements in a group.
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