private void validate(String appId, String secretKey, boolean encrypt) throws IOException {

    ExternalShuffleClient client =

      new ExternalShuffleClient(conf, new TestSecretKeyHolder(appId, secretKey), true, encrypt);

    client.init(appId);

    client.registerWithShuffleServer(TestUtils.getLocalHost(), server.getPort(), "exec0",

      new ExecutorShuffleInfo(new String[0], 0, ""));

    client.close();

  }