If you have a secured Hadoop cluster, your security options depend on your driver. All drivers have the Kerberos option. If you are using a Hortonworks driver, you can also select Knox as your security type. If you are connected to a Pentaho Repository, you can specify additional Kerberos options for secure impersonation. See the Administer Pentaho Data Integration and Analytics document for further information on secure impersonation.
If you are not sure what security type is set up for your Hadoop cluster, contact your cluster administrator for the correct credentials.
Note: For Kerberos, you need the authentication user name and either a password or a keytab file. For Knox, you need the Gateway URL, user name, and password.