What if the acknowledgement message gets lost?
如果确认消息丢失怎么办？
Once it has completed, it sends an acknowledgement message back to the client.
一旦处理完毕，它将发送一条确认消息给客户端。
If the server fails, the client gets no acknowledgement message from the server. There are two possible scenarios.
如果服务器发生故障，客户端将从服务器得不到确认信息，将有可能发生两种情形。
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