Github user squito commented on a diff in the pull request:
https://github.com/apache/spark/pull/11105#discussion_r86486722
--- Diff: core/src/main/scala/org/apache/spark/util/AccumulatorV2.scala ---
@@ -136,15 +181,92 @@ abstract class AccumulatorV2[IN, OUT] extends
Serializable {
def reset(): Unit
/**
+ * Takes the inputs and accumulates. e.g. it can be a simple `+=` for
counter accumulator.
+ * Developers should extend addImpl to customize the adding
functionality.
+ */
+ final def add(v: IN): Unit = {
--- End diff --
ok maybe another subclass of `AccumulatorV2`? sucks that we woudn't get
data property goodness in all accumulators automatically, though
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