Github user squito commented on a diff in the pull request: https://github.com/apache/spark/pull/11105#discussion_r86486267 --- 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 -- oh crap. you are going to hate me ... making this `final` is going to break binary compatibility. is there any other alternative? I will keep thinking but I can't come up with anything.
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