private Token<? extends TokenIdentifier> generateDelegationToken(
final NameNode namenode, final UserGroupInformation ugi, final String renewer)
throws IOException {
final Credentials c =
DelegationTokenSecretManager.createCredentials(
namenode, ugi, renewer != null ? renewer : ugi.getShortUserName());
final Token<? extends TokenIdentifier> t = c.getAllTokens().iterator().next();
t.setKind(WebHdfsFileSystem.TOKEN_KIND);
SecurityUtil.setTokenService(t, namenode.getHttpAddress());
return t;
}
