Github user jiangxb1987 commented on a diff in the pull request:
https://github.com/apache/spark/pull/21758#discussion_r205660610
--- Diff: core/src/main/scala/org/apache/spark/rdd/RDD.scala ---
@@ -1647,6 +1647,14 @@ abstract class RDD[T: ClassTag](
}
}
+ /**
+ * :: Experimental ::
+ * Indicates that Spark must launch the tasks together for the current
stage.
+ */
+ @Experimental
+ @Since("2.4.0")
+ def barrier(): RDDBarrier[T] = withScope(new RDDBarrier[T](this))
--- End diff --
I opened https://issues.apache.org/jira/browse/SPARK-24941 for this.
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