...
Apache Ambari can only be used to add CDAP to an existing Hadoop cluster, one that already has the required services (Hadoop: HDFS, YARN, HBase, ZooKeeper, and—optionally—Hive and Spark) installed.
Ambari is for setting up HDP (Hortonworks Data Platform) on bare clusters; it can't be used for clusters with HDP already installed, where the original installation was not with Ambari.
A number of features are currently planned to be added, including:
select CDAP metrics and
a full smoke test of CDAP functionality after installation.
If you are installing CDAP with the intention of using replication, see these instructions on CDAP Replication before installing or starting CDAP.
Verification
Service Checks in Apache Ambari
Selecting CDAP from the left sidebar, or choosing it from the Services drop-down menu, will take you to the CDAP service screen.
...
CDAP is now running on your cluster, managed by Ambari. You can login to the CDAP UI at the address of the node running the CDAP UI service at port 11011. The drop-down Quick Links menu has a menu item directly to the CDAP UI.
CDAP Smoke Test
The CDAP UI may initially show errors while all of the CDAP YARN containers are starting up. Allow for up to a few minutes for this.
The Administration page of the CDAP UI shows the status of the CDAP services. It can be reached at http://<cdap-host>:11011/cdap/administration, substituting for <cdap-host> the host name or IP address of the CDAP server:
...
CDAP UI: Showing started-up, Administration page.
Advanced Topics
...