code: public AlluxioURI joinUnsafe(String suffix) {
      String path = getPath();
      StringBuilder sb = new StringBuilder(path.length() + 1 + suffix.length());
  
      return new AlluxioURI(this,
          sb.append(path).append(AlluxioURI.SEPARATOR).append(suffix).toString(), false);
    }
docs: Append additional path elements to the end of an {@link AlluxioURI}. This does not check if
  the new path needs normalization, and is less CPU intensive than {@link #join(String)}.
  
  @param suffix the suffix to add
  @return the new {@link AlluxioURI}