Optional: Spark Manual Downgrade Procedure

When upgrading to HDP 2.2.9 using Ambari, Spark 1.2.1 is automatically upgraded to 1.3.1.

	Note
	Spark downgrade is only available manually, and not from Ambari. Downgraded Spark is not managed from Ambari.

However, if you wish to return to using 1.2.1:

Stop all services related to Spark.
Remove Spark 1.3.1 from your HDP cluster using Ambari:
curl -u admin:admin -H "X-Requested-By: ambari" -X DELETE
http://<AMBARI_HOST>:8080/api/v1/clusters/<CLUSTER_NAME>/services/SPARK
Manually install Spark 1.2.1 with HDP 2.2.6 Installing HDP Manually: Installing and Configuring Apache Spark.