Github user cloud-fan commented on a diff in the pull request:
    --- Diff: core/src/main/scala/org/apache/spark/rdd/RDD.scala ---
    @@ -1384,14 +1385,15 @@ abstract class RDD[T: ClassTag](
        * @param ord the implicit ordering for T
        * @return an array of top elements
    -  def takeOrdered(num: Int)(implicit ord: Ordering[T]): Array[T] = 
withScope {
    +  def takeOrdered(num: Int, ser: Serializer = SparkEnv.get.serializer)
    --- End diff --
    this will break the java API.
    BTW, this method returns an Array, I don't think we can avoid OOM for large 
`num` anyway.

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