code: @Override
    public String getVersion(URI uri) throws IOException
    {
      try {
        return StringUtils.format("%d", buildFileObject(uri, config).getLastModified());
      }
      catch (HdfsIOException ex) {
        throw ex.getIOException();
      }
    }
docs: Return the "version" (aka last modified timestamp) of the URI
  
  @param uri The URI of interest
  
  @return The last modified timestamp of the uri in String format
  
  @throws IOException