Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/13594#discussion_r66644139
--- Diff: core/src/main/scala/org/apache/spark/util/AccumulatorV2.scala ---
@@ -415,15 +415,20 @@ class DoubleAccumulator extends
AccumulatorV2[jl.Double, jl.Double] {
}
-class ListAccumulator[T] extends AccumulatorV2[T, java.util.List[T]] {
+/**
+ * An [[AccumulatorV2 accumulator]] for collecting a list of elements.
+ *
+ * @since 2.0.0
+ */
+class CollectionAccumulator[T] extends AccumulatorV2[T, java.util.List[T]]
{
--- End diff --
the order is preserved for the inputs from same partitions, but not among
partitions.
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