Hello
Just wanted to share a problem & a solution:
After installing HDP and logging in to Ambari the HDFS summary page didn’t display any data (all metrics were with status “n/a” and upgrade status was in a state of “Upgrade not finalized”.
Also, when clicking on “Service Actions” button there were only “Start” & “Stop” and it took a few seconds for the rest of the options to appear (such as “Move namenode”, “Enable HA” etc.)
Anyways the problem was that a proxy was used in /var/lib/ambari-server/ambari-env.sh during the installation.
After removing the proxy server from the env file – problem solved.
The Ambari uses http in order to get it metrics from the nn thus tried to pass through the proxy server.
This is also imperative if one tries to go through the NameNode HA wizard. The “Next” button won’t turn green unless the http communication between Ambari Server to the Namenode is operational.