public function loadData($writerId, array $tables, $incrementalLoad = null, $queue = 'primary')
    {
        $job = $this->loadDataAsync($writerId, $tables, $incrementalLoad, $queue);
        if (!isset($job['url'])) {
            throw new ServerException('Load data job returned unexpected result: ' . json_encode($job, JSON_PRETTY_PRINT));
        }

        return $this->waitForJob($job['url']);
    }