srowen commented on a change in pull request #31540:
URL: https://github.com/apache/spark/pull/31540#discussion_r578541850
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File path: core/src/main/scala/org/apache/spark/util/AccumulatorV2.scala
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@@ -449,39 +449,46 @@ class DoubleAccumulator extends AccumulatorV2[jl.Double,
jl.Double] {
* @since 2.0.0
*/
class CollectionAccumulator[T] extends AccumulatorV2[T, java.util.List[T]] {
- private val _list: java.util.List[T] = Collections.synchronizedList(new
ArrayList[T]())
+ private var _list: java.util.List[T] = _
Review comment:
Does a `lazy val` work here? not sure what it generates under the hood
or whether it would also fix the issue. It would be simpler than handling init
lazily, but this is no big deal.
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