Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/22240#discussion_r212863571
--- Diff: core/src/main/scala/org/apache/spark/rdd/RDDBarrier.scala ---
@@ -22,15 +22,22 @@ import scala.reflect.ClassTag
import org.apache.spark.TaskContext
import org.apache.spark.annotation.{Experimental, Since}
-/** Represents an RDD barrier, which forces Spark to launch tasks of this
stage together. */
-class RDDBarrier[T: ClassTag](rdd: RDD[T]) {
+/**
+ * :: Experimental ::
+ * Wraps an RDD in a barrier stage, which forces Spark to launch tasks of
this stage together.
+ * [[RDDBarrier]] instances are created by [[RDD.barrier]].
+ */
+@Experimental
+@Since("2.4.0")
+class RDDBarrier[T: ClassTag] private[spark] (rdd: RDD[T]) {
--- End diff --
also hide the constructor here
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