@Override
  public void close() throws KerberosOperationException {
    createAttributes = null;
    executableKadmin = null;

    super.close();
  }
Prepares and creates resources to be used by this KerberosOperationHandler
<p/>
It is expected that this KerberosOperationHandler will not be used before this call.
<p/>
The kerberosConfiguration Map is not being used.

@param administratorCredentials a PrincipalKeyCredential containing the administrative credential
                                for the relevant KDC
@param realm                    a String declaring the default Kerberos realm (or domain)
@param kerberosConfiguration    a Map of key/value pairs containing data from the kerberos-env configuration set
@throws KerberosKDCConnectionException       if a connection to the KDC cannot be made
@throws KerberosAdminAuthenticationException if the administrator credentials fail to authenticate
@throws KerberosRealmException               if the realm does not map to a KDC
@throws KerberosOperationException           if an unexpected error occurred
ambari-server/src/main/java/org/apache/ambari/server/serveraction/kerberos/MITKerberosOperationHandler.java