Github user holdenk commented on a diff in the pull request: https://github.com/apache/spark/pull/11105#discussion_r86493902 --- 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 -- Or maybe just DataAccumulator since V1 - V2 was a big change and this really isn't all that big of a change.
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