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

    https://github.com/apache/spark/pull/17697#discussion_r112380031
  
    --- Diff: 
mllib/src/main/scala/org/apache/spark/mllib/rdd/MLPairRDDFunctions.scala ---
    @@ -39,8 +39,8 @@ class MLPairRDDFunctions[K: ClassTag, V: ClassTag](self: 
RDD[(K, V)]) extends Se
        * @param ord the implicit ordering for T
        * @return an RDD that contains the top k values for each key
        */
    -  def topByKey(num: Int)(implicit ord: Ordering[V]): RDD[(K, Array[V])] = {
    -    self.aggregateByKey(new BoundedPriorityQueue[V](num)(ord))(
    +  def topByKey(num: Int, bucketsCount: Int = 200)(implicit ord: 
Ordering[V]): RDD[(K, Array[V])] = {
    --- End diff --
    
    This might be problematic because it changes the binary API. It is a 
developer API though.


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