apache/hadoop · error · SaslException

Client generated spurious response

Error message

Client generated spurious response

What it means

Error "Client generated spurious response" thrown in apache/hadoop.

Source

Thrown at hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/SaslRpcClient.java:501

   */
  private byte[] saslEvaluateToken(RpcSaslProto saslResponse,
      boolean serverIsDone) throws SaslException {
    byte[] saslToken = null;
    if (saslResponse.hasToken()) {
      saslToken = saslResponse.getToken().toByteArray();
      saslToken = saslClient.evaluateChallenge(saslToken);
    } else if (!serverIsDone) {
      // the server may only omit a token when it's done
      throw new SaslException("Server challenge contains no token");
    }
    if (serverIsDone) {
      // server tried to report success before our client completed
      if (!saslClient.isComplete()) {
        throw new SaslException("Client is out of sync with server");
      }
      // a client cannot generate a response to a success message
      if (saslToken != null) {
        throw new SaslException("Client generated spurious response");        
      }
    }
    return saslToken;
  }

  private RpcSaslProto.Builder createSaslReply(SaslState state,
                                               byte[] responseToken) {
    RpcSaslProto.Builder response = RpcSaslProto.newBuilder();
    response.setState(state);
    if (responseToken != null) {
      response.setToken(ByteString.copyFrom(responseToken));
    }
    return response;
  }

  private boolean useWrap() {
    // getNegotiatedProperty throws if client isn't complete
    String qop = (String) saslClient.getNegotiatedProperty(Sasl.QOP);

View on GitHub (pinned to 2add963021)

Solutions

1. This indicates a client-side SASL state error; upgrade the client to a fixed Hadoop version if running an old release.
2. Retry the operation after resetting the connection.
3. Check for concurrent use of the same connection from multiple threads.

When it happens

Trigger: Thrown at hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/SaslRpcClient.java:501 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of apache/hadoop@2add963021 (2026-08-22). Data as JSON: /api/errors/f6f1fc41f9f36d4f. Report an issue: GitHub.