apache/hadoop · error · IOException

Could not instantiate KMSProvider.

Error message

Could not instantiate KMSProvider.

What it means

Error "Could not instantiate KMSProvider." thrown in apache/hadoop.

Source

Thrown at hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/crypto/key/kms/KMSClientProvider.java:322

        KMSClientProvider[] providers =
            createProviders(conf, origUrl, port, hostsPart);
        return new LoadBalancingKMSClientProvider(providerUri, providers, conf);
      }
      return null;
    }

    private KMSClientProvider[] createProviders(Configuration conf,
        URL origUrl, int port, String hostsPart) throws IOException {
      String[] hosts = hostsPart.split(";");
      KMSClientProvider[] providers = new KMSClientProvider[hosts.length];
      for (int i = 0; i < hosts.length; i++) {
        try {
          providers[i] =
              new KMSClientProvider(
                  new URI("kms", origUrl.getProtocol(), hosts[i], port,
                      origUrl.getPath(), null, null), conf);
        } catch (URISyntaxException e) {
          throw new IOException("Could not instantiate KMSProvider.", e);
        }
      }
      return providers;
    }
  }

  private URL kmsUrl;
  private SSLFactory sslFactory;
  private ConnectionConfigurator configurator;
  private DelegationTokenAuthenticatedURL.Token authToken;
  private final int authRetry;

  @Override
  public String toString() {
    final StringBuilder sb = new StringBuilder("KMSClientProvider[");
    sb.append(kmsUrl).append("]");
    return sb.toString();
  }

View on GitHub (pinned to 2add963021)

Solutions

1. Check the KMS provider configuration; the wrapped exception shows why instantiation failed.

Example fix

Verify the kms URL and credentials in the configuration.

When it happens

Trigger: Raised at runtime when the documented precondition or configuration requirement for this operation is violated.

Common situations: Misconfigured or missing property, invalid user input, or calling the API before its prerequisites are met.

AI-assisted analysis of apache/hadoop@2add963021 (2026-08-22). Data as JSON: /api/errors/2e45c1b7c3b7c5d0. Report an issue: GitHub.