Github user squito commented on a diff in the pull request:
    --- Diff: core/src/main/scala/org/apache/spark/util/AccumulatorV2.scala ---
    @@ -42,18 +60,43 @@ private[spark] case class AccumulatorMetadata(
      * `OUT` should be a type that can be read atomically (e.g., Int, Long), 
or thread-safely
      * (e.g., synchronized collections) because it will be read from other 
    -abstract class AccumulatorV2[IN, OUT] extends Serializable {
    +abstract class AccumulatorV2[@specialized(Int, Long, Double) IN, OUT] 
extends Serializable {
    --- End diff --
    unrelated to this change, right?  if you think its important open another 
jira / pr.

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