这些已存储的请求将不再被重新提交给错误的或不可用的服务。
These stored requests will not be submitted to the faulty or unavailable target service anymore.
但是，在某些情况下(例如，服务所请求的后端系统或数据库不可用)，该服务可能会以错误消息作为响应。
However, in certain circumstances, for example, when either a back-end system or a database that a service requires is not available, the service might respond with a fault message.
如果特定服务器在请求到达时不可用或过于繁忙，集群可以透明地将该请求传递给其他可用的服务器。
If any given server is unavailable or too busy at the time the request arrives, the cluster transparently passes the request to a server capable of handling the work.
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