Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/22240#discussion_r212863543
--- Diff: core/src/main/scala/org/apache/spark/BarrierTaskInfo.scala ---
@@ -28,4 +28,4 @@ import org.apache.spark.annotation.{Experimental, Since}
*/
@Experimental
@Since("2.4.0")
-class BarrierTaskInfo(val address: String)
+class BarrierTaskInfo private[spark] (val address: String)
--- End diff --
hide the constructor since this is not to be constructed by user
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