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.
文件列表只是一个文本文件，其中列出文件或目录。
The file list is simply a text file with the list of files or directories. Here's an example.
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