apache/hadoop · error · RuntimeException

unknown type

Error message

unknown type

What it means

Error "unknown type" thrown in apache/hadoop.

Source

Thrown at hadoop-tools/hadoop-streaming/src/main/java/org/apache/hadoop/typedbytes/TypedBytesWritableInput.java:138

      return readBoolean();
    case INT:
      return readVInt();
    case LONG:
      return readVLong();
    case FLOAT:
      return readFloat();
    case DOUBLE:
      return readDouble();
    case STRING:
      return readText();
    case VECTOR:
      return readArray();
    case MAP:
      return readMap();
    case WRITABLE:
      return readWritable();
    default:
      throw new RuntimeException("unknown type");
    }
  }

  public Class<? extends Writable> readType() throws IOException {
    Type type = in.readType();
    if (type == null) {
      return null;
    }
    switch (type) {
    case BYTES:
      return BytesWritable.class;
    case BYTE:
      return ByteWritable.class;
    case BOOL:
      return BooleanWritable.class;
    case INT:
      return VIntWritable.class;
    case LONG:

View on GitHub (pinned to 2add963021)

Solutions

1. Check the typedbytes stream; an unrecognized type code indicates corrupt or misaligned input.

When it happens

Trigger: TypedBytesWritableInput reads a typedbytes type code it cannot map to a writable value, indicating a corrupted or unexpected stream.

Common situations: See trigger scenarios.

AI-assisted analysis of apache/hadoop@2add963021 (2026-08-22). Data as JSON: /api/errors/1baaf0ed3f344910. Report an issue: GitHub.