docs: public <T> T executeFdfsTrackerCmd(FdfsCommand<T> command) {
          Connection conn = null;
          InetSocketAddress address = null;
          // 获取连接
          try {
              address = trackerLocator.getTrackerAddress();
              LOGGER.debug("获取到Tracker连接地址{}", address);
              conn = getConnection(address);
              trackerLocator.setActive(address);
          } catch (FdfsConnectException e) {
              trackerLocator.setInActive(address);
              throw e;
          } catch (Exception e) {
              LOGGER.error("Unable to borrow buffer from pool", e);
              throw new RuntimeException("Unable to borrow buffer from pool", e);
          }
          // 执行交易
          return execute(address, conn, command);
      }