apache/hadoop · error · IllegalArgumentException

Invalid AuthFlavor value

Error message

Invalid AuthFlavor value 

What it means

Error "Invalid AuthFlavor value " thrown in apache/hadoop.

Source

Thrown at hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/oncrpc/security/RpcAuthInfo.java:50

    RPCSEC_GSS(6);

    private int value;

    AuthFlavor(int value) {
      this.value = value;
    }

    public int getValue() {
      return value;
    }

    static AuthFlavor fromValue(int value) {
      for (AuthFlavor v : values()) {
        if (v.value == value) {
          return v;
        }
      }
      throw new IllegalArgumentException("Invalid AuthFlavor value " + value);
    }
  }

  private final AuthFlavor flavor;

  protected RpcAuthInfo(AuthFlavor flavor) {
    this.flavor = flavor;
  }

  /**
   * Load auth info.
   * @param xdr XDR message
   */
  public abstract void read(XDR xdr);

  /** Write auth info.
   * @param xdr XDR message
   */

View on GitHub (pinned to 2add963021)

Solutions

1. Verify the AuthFlavor value in the RPC header is one of the supported constants; invalid values indicate corrupted traffic or a non-Hadoop client.
2. Check for port conflicts causing foreign protocol data to reach the RPC endpoint.
3. Align client and server Hadoop versions so both understand the same auth flavors.

When it happens

Trigger: Thrown at hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/oncrpc/security/RpcAuthInfo.java:50 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/f94032cba8bdd282. Report an issue: GitHub.