Major Description
When using Vintela to integrate Linux with AD, principals are lowercased. If the accounts in AD have uppercase characters (ie FooBar) the Kerberos principals have also uppercase characters (ie FooBar/<HOST>). Because of this, when a service (Yarn/HDFS) extracts the service name from the Kerberos principal (FooBar) and uses it for obtain groups the user is not found because via Linux the user FooBar is unknown, it has been converted to foobar.