I'm configuring Ambari Views with Kerberos.
After setting the proxyusers described in the Ambari Security Guide, I'm prompted to restart several services (HDFS, Yarn, Mapreduce, HBase, Oozie I believe).
However, Hive View will not launch, saying that the necessary proxyuser configurations are not present. HiveServer2 apparently looks at core-site.xml on process start and then refers back to that for the proxyuser check.
Restarting HiveServer2 resolves the issue.
Clearly HiveServer2 is sensitive to proxyuser configuration, so I suggest adding it to the list of components that are prompted for restart in Ambari.
I've checked this in Ambari 2.2.2 and 2.4.1.
That doc specifically says "4. Save the configuration change and restart the required components as indicated by Ambari."
It should say "and HiveServer2 in order to use Hive View".