群集需要尽可能地用最高可用性时间来实现高可用性。
The clusters cover the need to implement high availability with the highest possible availability time.
图15：很明显，顾客关注度最高的是可用性。
Figure 15: Clearly, usability is the highest priority for the customer.
消息被发送到级别最高的一个或多个队列，因此这个细粒度允许对队列排序，以表明应用程序可用性的等级。
Messages are sent to the highest ranked queue or queues, and so this granularity allows queues to be ordered to indicate grades of application availability.
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