byte [] qualifier, long value, long amount) {
    long newValue = value + amount;
    KeyValue newKv = new KeyValue(row, f, qualifier,
        System.currentTimeMillis(),
        Bytes.toBytes(newValue));
    return new ICVResult(newValue, newKv.heapSize(), newKv);
  }
  public static final long FIXED_OVERHEAD = ClassSize.align(
      ClassSize.OBJECT + (17 * ClassSize.REFERENCE) +
      (5 * Bytes.SIZEOF_LONG) + (3 * Bytes.SIZEOF_INT) + Bytes.SIZEOF_BOOLEAN +