Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/13211#discussion_r64142098
--- Diff: core/src/main/scala/org/apache/spark/util/AccumulatorV2.scala ---
@@ -437,7 +438,9 @@ class ListAccumulator[T] extends AccumulatorV2[T,
java.util.List[T]] {
s"Cannot merge ${this.getClass.getName} with
${other.getClass.getName}")
}
- override def value: java.util.List[T] =
java.util.Collections.unmodifiableList(_list)
+ override def value: java.util.List[T] = _list.synchronized {
+ java.util.Collections.unmodifiableList(new ArrayList[T](_list))
--- End diff --
I think so. Allowing users modifying the list seems not a good idea.
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