Github user nongli commented on a diff in the pull request:
https://github.com/apache/spark/pull/11534#discussion_r55280347
--- Diff: core/src/main/scala/org/apache/spark/storage/BlockManager.scala
---
@@ -744,7 +732,7 @@ private[spark] class BlockManager(
level: StorageLevel,
tellMaster: Boolean = true,
effectiveStorageLevel: Option[StorageLevel] = None,
- keepReadLock: Boolean = false): Option[PutResult] = {
+ keepReadLock: Boolean = false): Option[Option[Iterator[Any]]] = {
--- End diff --
Why do levels of options? What does it mean if the outer is set but the
inner is not
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