apache/hadoop · error · IllegalArgumentException

Invalid message type {}

Error message

Invalid message type {}

What it means

Error "Invalid message type {}" thrown in apache/hadoop.

Source

Thrown at hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/oncrpc/RpcMessage.java:47

    public int getValue() {
      return ordinal();
    }

    public static Type fromValue(int value) {
      if (value < 0 || value >= values().length) {
        return null;
      }
      return values()[value];
    }
  }

  protected final int xid;
  protected final Type messageType;

  RpcMessage(int xid, Type messageType) {
    if (messageType != Type.RPC_CALL && messageType != Type.RPC_REPLY) {
      throw new IllegalArgumentException("Invalid message type " + messageType);
    }
    this.xid = xid;
    this.messageType = messageType;
  }

  public abstract XDR write(XDR xdr);

  public int getXid() {
    return xid;
  }

  public Type getMessageType() {
    return messageType;
  }

  protected void validateMessageType(Type expected) {
    if (expected != messageType) {
      throw new IllegalArgumentException("Message type is expected to be "

View on GitHub (pinned to 2add963021)

Solutions

1. Verify the RPC message type field is a valid value (CALL or REPLY) per the ONC RPC specification; corrupted or foreign traffic on the port can produce invalid types.
2. Check that no non-RPC service is sending data to this port.
3. Capture network traffic to identify the sender of the malformed message.

When it happens

Trigger: Thrown at hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/oncrpc/RpcMessage.java:47 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/49726ee12107f083. Report an issue: GitHub.