code: public void internalClose() throws ThriftConnectionPoolException {
  		try {
  			if (this.thriftConnection != null) {
  				this.thriftConnection.close();
  			}
  			logicallyClosed.set(true);
  		} catch (IOException e) {
  			throw new ThriftConnectionPoolException(e);
  		}
  	}
docs: 关闭代理对象中的原始连接的方法
  
  @throws ThriftConnectionPoolException
  当关闭连接出现问题抛出该异常