Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/14140#discussion_r70453024
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/regression/IsotonicRegression.scala
---
@@ -408,8 +409,12 @@ class IsotonicRegression private (private var
isotonic: Boolean) extends Seriali
*/
private def parallelPoolAdjacentViolators(
input: RDD[(Double, Double, Double)]): Array[(Double, Double,
Double)] = {
- val parallelStepResult = input
- .sortBy(x => (x._2, x._1))
+ val keyedInput = input
--- End diff --
oh good point. Well, if you're following your current approach, I think you
could get rid of the glom at least and just hand back an `Iterator(...toArray)`
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