apollo-client/src/main/java/com/ctrip/framework/apollo/util/ConfigUtil.java/ConfigUtil/initQPS
class ConfigUtil:  private void initQPS() {
    String customizedLoadConfigQPS = System.getProperty("apollo.loadConfigQPS");
    if (!Strings.isNullOrEmpty(customizedLoadConfigQPS)) {
      try {
        loadConfigQPS = Integer.parseInt(customizedLoadConfigQPS);
      } catch (Throwable ex) {
        logger.error("Config for apollo.loadConfigQPS is invalid: {}", customizedLoadConfigQPS);
      }
    }

    String customizedLongPollQPS = System.getProperty("apollo.longPollQPS");
    if (!Strings.isNullOrEmpty(customizedLongPollQPS)) {
      try {
        longPollQPS = Integer.parseInt(customizedLongPollQPS);
      } catch (Throwable ex) {
        logger.error("Config for apollo.longPollQPS is invalid: {}", customizedLongPollQPS);
      }
    }
  }