中央服务区拥有用于决策自动伸缩需要的所有信息——它了解工作者的数目，它们的地点，它们的状态，以及工作序列的大小等。
The central server has all the information needed to decide to autoscale -- it knows the number of workers, their locations, their status, and the size of the work queue.
数据需求的例子有账号、人、文档、邮件、歌曲、图片，以及它们的属性比如状态、日期、大小、创建者、主题等。
Common examples include accounts, people, documents, messages, songs, images, as well as attributes of those such as status, dates, size, creator, subject, and so on. Functional requirements.
对医学图像而言，常需通过边缘的提取来确定病灶的大小、脏器的运动情况、血球流动状态等。
For the medical images, the edges are always necessary to determine the focus size, the viscera situation and blood corpuscle fluxion state etc.
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