Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/13594#discussion_r66583343
--- 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 --
Question: so this method still accumulates a list, despite its name (which
does sound better). Can an accumulator guarantee an order to the items add to
the list meaningfully? if not, then maybe it should be advertised as an
accumulator of a Collection.
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