Github user mridulm commented on a diff in the pull request:
https://github.com/apache/spark/pull/16380#discussion_r93566371
--- Diff:
core/src/main/scala/org/apache/spark/storage/ShuffleBlockFetcherIterator.scala
---
@@ -315,6 +315,10 @@ final class ShuffleBlockFetcherIterator(
* Throws a FetchFailedException if the next block could not be fetched.
*/
override def next(): (BlockId, InputStream) = {
+ if (!hasNext) {
+ throw new NoSuchElementException
+ }
+
--- End diff --
A lot of our iterators dont seem to enforce this invariant
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