这一类别可以粗略地归类为运行在数据库前端的无状态集群中的应用程序。

This class can be broadly categorized as applications that run in a stateless cluster in front of a database. I call this a symmetric cluster.

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现在，应用程序可以以不同的主题来归类。

Apps can now be grouped into different topics or themes.

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候选服务将基于它们在目标应用程序中扮演的角色进行归类。

Candidate services are categorized based on the roles they play in the target application.

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