从上次写操作到出现服务器故障之间对会话的任何更改都可能丢失。
Any changes in the session between the last write and a server failure can be lost.
由于有几个克隆的服务器可以用来处理请求,故障不太可能破坏系统的吞吐量和可靠性。
With several clones available to handle requests, it is more likely that failures will not damage throughput and reliability.
计算这些情况的可能性非常容易;问题在于存在很多不同的方式,比如10台服务器中的5台可能出故障。
It is quite easy to calculate the probabilities of those; the problem is that there are a lot of different ways that, say 5 out of 10 servers can be down.
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