def METHOD_NAME(pool, root_dir):
    """ Read raw node data from root dir. """
    _, nodes = lib.read_root_csv(root_dir)
    raw_node_data = []
    with progressbar.ProgressBar(max_value=len(nodes)) as bar:
        for idx, node in enumerate(pool.imap_unordered(
                read_json5,
                nodes,
                chunksize=20,
        )):
            bar.update(idx)
            raw_node_data.append(node)
            bar.update(idx + 1)
    return raw_node_data