横向扩展通常用于应用服务器层。
Horizontal scaling is typically employed for the application server tier.
这可能是托管了与应用程序或遗留系统集成的适配器的应用服务器层。
This might be an application server layer hosting adaptors integrated with application or legacy systems.
谁被选举为活动服务器，将把应用服务器层发来的内容群发到其它服务器上。
Whoever is voted active becomes the active in an election process, and then evreything that is sent to him via the appserver tier he sends to the other guys multicast.
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