Github user ScrapCodes commented on a diff in the pull request:
https://github.com/apache/spark/pull/140#discussion_r10632880
--- Diff: core/src/main/scala/org/apache/spark/rdd/DoubleRDDFunctions.scala
---
@@ -86,14 +92,9 @@ class DoubleRDDFunctions(self: RDD[Double]) extends
Logging with Serializable {
* If the elements in RDD do not vary (max == min) always returns a
single bucket.
*/
def histogram(bucketCount: Int): Pair[Array[Double], Array[Long]] = {
- // Compute the minimum and the maxium
- val (max: Double, min: Double) = self.mapPartitions { items =>
- Iterator(items.foldRight(Double.NegativeInfinity,
- Double.PositiveInfinity)((e: Double, x: Pair[Double, Double]) =>
- (x._1.max(e), x._2.min(e))))
- }.reduce { (maxmin1, maxmin2) =>
- (maxmin1._1.max(maxmin2._1), maxmin1._2.min(maxmin2._2))
- }
+ // Compute the minimum and the maximum from stats once
+ val _stats = stats()
+ val (max: Double, min: Double) = (_stats.max, _stats.min)
--- End diff --
Okay, will change that.
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