void config_fromzk(lock_service& z,
const string& type, const string& name,
string& config)
{
// server must get read lock for config_lock before call this method.
string path;
build_config_path(path, type, name);
if(!z.exists(path))
throw JUBATUS_EXCEPTION(jubatus::exception::runtime_error("config is not exists: " + path));
if (!z.read(path, config))
throw JUBATUS_EXCEPTION(jubatus::exception::runtime_error("failed to get config from zookeeper: " + path)
<< jubatus::exception::error_api_func("lock_service::read"));
LOG(INFO) << "get config from zookeeper: " << path;
}
