服务器在某一时刻启动并运行，但是可能在另一时刻当机。
Servers that are up and running one moment may be down the next.
将同一时刻访问的对象分组到一起的垃圾收集器能够对应用程序性能产生积极影响。
Garbage collectors that group objects that are accessed at the same time together have a positive effect on application performance.
RPC是基于消息的：消息被发送到大的服务器，然后，在某一刻，会收到从大的服务器发出的“好，我做完了”的消息。
RPC is message-based: a message was sent to the big server, and, at some point, a message saying "OK, I'm done" will be received from that big server.
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