@Override
public GetDelegationTokenResponseProto getDelegationToken(
RpcController controller, GetDelegationTokenRequestProto proto)
throws ServiceException {
GetDelegationTokenRequestPBImpl request =
new GetDelegationTokenRequestPBImpl(proto);
try {
GetDelegationTokenResponse response = real.getDelegationToken(request);
return ((GetDelegationTokenResponsePBImpl) response).getProto();
} catch (YarnException e) {
throw new ServiceException(e);