Github user mridulm commented on a diff in the pull request:
https://github.com/apache/spark/pull/15371#discussion_r82683704
--- Diff: core/src/main/scala/org/apache/spark/util/AccumulatorV2.scala ---
@@ -444,7 +444,9 @@ class CollectionAccumulator[T] extends AccumulatorV2[T,
java.util.List[T]] {
override def copy(): CollectionAccumulator[T] = {
val newAcc = new CollectionAccumulator[T]
- newAcc._list.addAll(_list)
+ _list.synchronized {
--- End diff --
You are right, in this codepath, it is indeed protected by mutex = this.
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