docs: private MysqlConnection buildMysqlConnection(AuthenticationInfo runningInfo) {
          MysqlConnection connection = new MysqlConnection(runningInfo.getAddress(),
              runningInfo.getUsername(),
              runningInfo.getPassword(),
              connectionCharsetNumber,
              runningInfo.getDefaultDatabaseName());
          connection.getConnector().setReceiveBufferSize(receiveBufferSize);
          connection.getConnector().setSendBufferSize(sendBufferSize);
          connection.getConnector().setSoTimeout(defaultConnectionTimeoutInSeconds * 1000);
          connection.setCharset(connectionCharset);
          connection.setReceivedBinlogBytes(receivedBinlogBytes);
          // 随机生成slaveId
          if (this.slaveId <= 0) {
              this.slaveId = generateUniqueServerId();
          }
          connection.setSlaveId(this.slaveId);
          return connection;
      }