Github user squito commented on a diff in the pull request: https://github.com/apache/spark/pull/3079#discussion_r20062337 --- Diff: core/src/main/scala/org/apache/spark/Partitioner.scala --- @@ -113,8 +117,12 @@ 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 -- `valRD` is a kinda confusing name. I think the convention would be to name it `_rangeBounds`. Eg. https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/FutureAction.scala#L111
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