struct BatchSpanProcessorOptions
{
  /**
   * The maximum buffer/queue size. After the size is reached, spans are
   * dropped.
   */
  size_t max_queue_size = 2048;

  /* The time interval between two consecutive exports. */
  std::chrono::milliseconds schedule_delay_millis = std::chrono::milliseconds(5000);

  /**
   * The maximum batch size of every export. It must be smaller or
   * equal to max_queue_size.
   */
  size_t max_export_batch_size = 512;
};