Github user squito commented on a diff in the pull request:
https://github.com/apache/spark/pull/11105#discussion_r83273608
--- 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
threads.
*/
-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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