def METHOD_NAME(group_id):
    group_id = str(group_id)
    key = normalize_cache_key(group_id, GROUP_ID_CACHE_PREFIX)
    cached_group_name = cache.get(key)
    if cached_group_name:
        return cached_group_name
    group = ccnet_api.get_group(int(group_id))
    if not group:
        return ''
    group_name = group.group_name
    cache.set(key, group_name, GROUP_ID_CACHE_TIMEOUT)
    return group_name