uwsgi 如何安全停止？

1.看官网文档 http://uwsgi-docs.readthedocs.org/en/latest/Management.html#reloading-the-server ，使用-HUP可以优雅重启，不过我在测试的时候，却是直接杀死了，并没有等待请求处理结束（难道是因为我使用time.sleep(5)来模拟长作业的缘故？），日志如下，虽然显示200，不过浏览器那边却“连接已中断”

...gracefully killing workers...
Gracefully killing worker 2 (pid: 9610)...
Gracefully killing worker 1 (pid: 9609)...
Gracefully killing worker 3 (pid: 9611)...
Gracefully killing worker 4 (pid: 9639)...
worker 1 buried after 1 seconds
worker 2 buried after 1 seconds
worker 3 buried after 1 seconds
[pid: 9639|app: 0|req: 11/14] 111.206.83.99 () {42 vars in 1782 bytes} [Tue Jul 8 17:59:16 2014] GET /config/long => generated 2 bytes in 5005 msecs (HTTP/1.1 200) 1 headers in 51 bytes (1 switches on core 14)
worker 4 buried after 4 seconds
2.如何安全停止服务器？文档中似乎只有-INT是停止，不过似乎是直接干掉了uwsgi，并不等所有请求处理完成

3.Python Webservice在数据一致性，服务可靠性要求高的情况下，如何选择服务器？要求可以优雅停止、重启。