1. Deployed Ambari from
http://public-repo-1.hortonworks.com/ambari/centos6/1.x/updates/188.8.131.52/ambari.repo with Oracle as ambari-DB.
2. Deployed hadoop with existing oracle db as db for Hive and Oozie on 1.3.2 stack from private repo (http://private-repo-1.hortonworks.com/HDP/centos6/1.x/updates/184.108.40.206).
4. Upgraded to 1.5.0. Stopped, started all services.
5. Successful, besides hitting BUG-15405 and BUG-15675.
6. Attempted to add host. After 'Review page' some 'Server error' popped up.