Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/15041#discussion_r79410775 --- 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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