Github user pwendell commented on a diff in the pull request:
https://github.com/apache/spark/pull/3310#discussion_r20454389
--- Diff: core/src/main/scala/org/apache/spark/rdd/RDD.scala ---
@@ -1309,7 +1309,7 @@ abstract class RDD[T: ClassTag](
def debugSelf (rdd: RDD[_]): Seq[String] = {
import Utils.bytesToString
- val persistence = storageLevel.description
+ val persistence = if (storageLevel != StorageLevel.NONE)
storageLevel.description else ""
val storageInfo = rdd.context.getRDDStorageInfo.filter(_.id ==
rdd.id).map(info =>
--- End diff --
Because of the `map` statement in this line, the storage info won't be
displayed unless there are actually cached partitions.
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