Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/3884#discussion_r22448625
--- Diff: core/src/main/scala/org/apache/spark/rdd/RDD.scala ---
@@ -76,10 +76,22 @@ 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)) {
+ throw new SparkException("Spark does not support nested RDDs (see
SPARK-5063)")
+ }
+
+ private def sc: SparkContext = {
+ if (_sc == null) {
+ throw new SparkException(
+ "Can only define RDDs and perform actions on the driver, not in
tasks (see SPARK-5063)")
--- End diff --
Looks good!
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