2.9.0 still has some issues. You have stumbled on one of them https://issues.igniterealtime.org/browse/SPARK-2065
Here is the list of all issues Issues blocking 2.9.0 release
2.9.0 still has some issues. You have stumbled on one of them https://issues.igniterealtime.org/browse/SPARK-2065
Here is the list of all issues Issues blocking 2.9.0 release