前一个复制缓存器使每个节点在本地都有元数据信息，像列出文件列表之类的任务就不必使用RPC远程过程调用了。
The former is replicated so that each node has metadata information locally and would not need to make RPC calls for tasks like listing the files.
这样的编码是被称为远程过程调用（RPC）系统的主要部分，它们有一个共同的目标，就是使对远程计算机发出的请求看起来象是本地过程调用一样。
Such encodings are the staple of what is known as remote procedure call (RPC) systems, which have the common aim of making requests to remote computers look just like local procedure invokations.
因此，本地过程中位于无效远程过程调用之前的语句可能全部运行正常，而之后的语句则根本不会运行。
Therefore, all statements in a local procedure that precede an invalid procedure call might run successfully. Statements subsequent to an invalid procedure call do not run at all.
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