Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/3884#discussion_r23397684
--- Diff: core/src/main/scala/org/apache/spark/rdd/RDD.scala ---
@@ -76,10 +76,25 @@ import org.apache.spark.util.random.{BernoulliSampler,
PoissonSampler, Bernoulli
* on RDD internals.
*/
abstract class RDD[T: ClassTag](
- @transient private var sc: SparkContext,
+ @transient private var _sc: SparkContext,
@transient private var deps: Seq[Dependency[_]]
) extends Serializable with Logging {
+ if (classOf[RDD[_]].isAssignableFrom(elementClassTag.runtimeClass)) {
--- End diff --
Similarly, this should perhaps be a warning instead of an exception in
order to avoid any possibility of breaking odd corner-case 1.2.1 apps. I'll
change this to a warning and leave the `sc` getter as an exception.
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