在将数据备份到一个目录文件系统的过程中，应该指定- d选项，以关闭ontape交互式提示符。

During a backup to a directory file system, you should specify the -d option to turn off ontape interactive prompts.

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当文件关闭时，在临时文件中剩余的没有flush的数据也会传输到指定的Datanode，然后客户端告诉Namenode文件已经关闭。

When a file is closed, the remaining un-flushed data in the temporary local file is transferred to the DataNode. The client then tells the NameNode that the file is closed.

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已知字符串和文件路径，此方法打开指定的文件，将字符串写入文件，然后关闭该文件。

Given a string and a file path, this method opens the specified file, writes the string to the file, and then closes the file.

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