[GitHub] spark pull request #17697: [SPARK-20414][MLLIB] avoid creating only 16 reduc...

[srowen <gi...@git.apache.org>]

Github user srowen commented on a diff in the pull request:

    https://github.com/apache/spark/pull/17697#discussion_r114182801
  
    --- Diff: mllib/src/main/scala/org/apache/spark/mllib/rdd/MLPairRDDFunctions.scala ---
    @@ -49,6 +49,18 @@ class MLPairRDDFunctions[K: ClassTag, V: ClassTag](self: RDD[(K, V)]) extends Se
           }
         ).mapValues(_.toArray.sorted(ord.reverse))  // This is a min-heap, so we reverse the order.
       }
    +
    +  def topByKey(num: Int, bucketsCount: Int = 200)(implicit ord: Ordering[V]): RDD[(K, Array[V])] = {
    --- End diff --
    
    Doesn't this make a call to `topByKey(n)` ambiguous? maybe not, but seems like it should. I don't think you want a default value here. The 'default' case is the existing method.


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