Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/9382#discussion_r43568010
--- Diff: core/src/main/scala/org/apache/spark/util/NextIterator.scala ---
@@ -60,8 +60,10 @@ private[spark] abstract class NextIterator[U] extends
Iterator[U] {
*/
def closeIfNeeded() {
if (!closed) {
--- End diff --
By the way, this use of `nextIterator()` explains why this bug was able to
occur on 1.4.x: the first close() call, which throws an exception, comes from
`NextIterator`, and the second comes from the task completion listener.
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