Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/1689#discussion_r15919599
--- Diff: core/src/main/scala/org/apache/spark/Partitioner.scala ---
@@ -113,8 +113,12 @@ class RangePartitioner[K : Ordering : ClassTag, V](
private var ordering = implicitly[Ordering[K]]
// An array of upper bounds for the first (partitions - 1) partitions
- private var rangeBounds: Array[K] = {
- if (partitions <= 1) {
+ @volatile private var valRB: Array[K] = null
--- End diff --
Any idea on volatile's impact on read performance? rangeBounds is read
multiple times in getPartition.
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