After Kerberos has been enabled, I was not able to open Hive View from Ambari.
I would get the following error message:
Service 'userhome' check failed: Usernames not matched: name=root != expected=ambari-server-<clusterName>
Service 'userhome' check failed:
java.io.IOException: Usernames not matched: name=root != expected=ambari-server-<clusterName>
at sun.reflect.GeneratedConstructorAccessor248.newInstance(Unknown Source)
Ambari server is running as root so it tries to authenticate with a proxy user as 'root' where as the ambari.service.keytab expects a principal as ambari-server-<clusterName>@REALM. Hence the mismatch.