Github user mwws commented on a diff in the pull request:
https://github.com/apache/spark/pull/11595#discussion_r55616064
--- Diff: core/src/main/scala/org/apache/spark/rdd/RDD.scala ---
@@ -85,10 +85,13 @@ abstract class RDD[T: ClassTag](
private def sc: SparkContext = {
if (_sc == null) {
throw new SparkException(
- "RDD transformations and actions can only be invoked by the
driver, not inside of other " +
- "transformations; for example, rdd1.map(x => rdd2.values.count() *
x) is invalid because " +
- "the values transformation and count action cannot be performed
inside of the rdd1.map " +
- "transformation. For more information, see SPARK-5063.")
+ "This RDD refers to empty SparkContext. It could happen in
following cases: \n(1) RDD " +
--- End diff --
Shame... I will fix it. Thanks for the comment
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