apache/hadoop · error · IOException

No providers configured !

Error message

No providers configured !

What it means

Error "No providers configured !" thrown in apache/hadoop.

Source

Thrown at hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/crypto/key/kms/LoadBalancingKMSClientProvider.java:170

    if (token == null) {
      token = KMSClientProvider.selectDelegationToken(creds, dtService);
    }
    // fallback to querying each sub-provider.
    if (token == null) {
      for (KMSClientProvider provider : getProviders()) {
        token = provider.selectDelegationToken(creds);
        if (token != null) {
          break;
        }
      }
    }
    return token;
  }

  private <T> T doOp(ProviderCallable<T> op, int currPos,
      boolean isIdempotent) throws IOException {
    if (providers.length == 0) {
      throw new IOException("No providers configured !");
    }
    int numFailovers = 0;
    for (int i = 0;; i++, numFailovers++) {
      KMSClientProvider provider = providers[(currPos + i) % providers.length];
      try {
        return op.call(provider);
      } catch (AccessControlException ace) {
        // No need to retry on AccessControlException
        // and AuthorizationException.
        // This assumes all the servers are configured with identical
        // permissions and identical key acls.
        throw ace;
      } catch (IOException ioe) {
        LOG.warn("KMS provider at [{}] threw an IOException: ",
            provider.getKMSUrl(), ioe);
        // SSLException can occur here because of lost connection
        // with the KMS server, creating a ConnectException from it,
        // so that the FailoverOnNetworkExceptionRetry policy will retry

View on GitHub (pinned to 2add963021)

Solutions

1. Configure at least one KMS provider URI in hadoop.security.key.provider.path.

Example fix

Add kms://http@host:9600/kms to the provider path.

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/a1677f48983abcd2. Report an issue: GitHub.