apache/hadoop · error · RuntimeException

value class has to be TypedBytesWritable

Error message

value class has to be TypedBytesWritable

What it means

Error "value class has to be TypedBytesWritable" thrown in apache/hadoop.

Source

Thrown at hadoop-tools/hadoop-streaming/src/main/java/org/apache/hadoop/typedbytes/TypedBytesWritableInput.java:301

  }

  public Text readText(Text t) throws IOException {
    if (t == null) {
      t = new Text();
    }
    t.set(in.readString());
    return t;
  }

  public Text readText() throws IOException {
    return readText(null);
  }

  public ArrayWritable readArray(ArrayWritable aw) throws IOException {
    if (aw == null) {
      aw = new ArrayWritable(TypedBytesWritable.class);
    } else if (!aw.getValueClass().equals(TypedBytesWritable.class)) {
      throw new RuntimeException("value class has to be TypedBytesWritable");
    }
    int length = in.readVectorHeader();
    Writable[] writables = new Writable[length];
    for (int i = 0; i < length; i++) {
      writables[i] = new TypedBytesWritable(in.readRaw());
    }
    aw.set(writables);
    return aw;
  }

  public ArrayWritable readArray() throws IOException {
    return readArray(null);
  }

  public MapWritable readMap(MapWritable mw) throws IOException {
    if (mw == null) {
      mw = new MapWritable();
    }

View on GitHub (pinned to 2add963021)

Solutions

1. Set the map output value class to TypedBytesWritable for this input format.

When it happens

Trigger: TypedBytesWritableInput.setValueClass is called with a class that does not extend TypedBytesWritable.

Common situations: See trigger scenarios.

AI-assisted analysis of apache/hadoop@2add963021 (2026-08-22). Data as JSON: /api/errors/11d8e0999f6be2b1. Report an issue: GitHub.