1 HDFS 的命令行使用Hadoop 命令行官方doc hadoop fs: 使用面最广，可以操作任务文件系统，包括本地文件系统、HDFS、FTP、S3等 hdfs dfs: 只能操作HDFS文件系统。 1 2 3 # 下面两种效果是一样的 hdfs dfs -ls /user/hive hadoop fs -ls /user/hive/ 如果操作HDFS文件系统，推荐使用 hdfs dfs,如果需要操作其他系统文件，使用hadoop fs命令 help 1 2 格

HDFS HDFS概述 Hadoop 分布式系统框架中，首要的基础功能就是文件系统，在 Hadoop 中使用 FileSystem 这个抽象类来表示我们的文件系统，这个抽象类下面有很多子实现类，究竟使用哪一种，需要看我们具体的实现类，在我们实际工作中，用到的最多的就是HDFS(分布式文件系统)以及LocalFileSystem(本地文件系统)了。 在现代的企

1 IntroductionThis is bold text, and this is emphasized text. Visit the Hugo website!

1 常用数据库的读写方式A blog (a truncation of “weblog”) is an informational website published on the World Wide Web consisting of discrete, often informal diary-style text entries (posts). Posts are typically displayed in reverse chronological order so that the most recent post appears first, at the top of the web page. Until 2009, blogs were usually the work of a single individual,[citation needed] occasionally of a small group, and often covered a single subject or topic. In the 2010s, “multi-author blogs” (MABs) emerged, featuring the writing of multiple authors and sometimes professionally edited. MABs from newspapers, other media outlets, universities, think tanks, advocacy groups, and similar institutions account for an increasing quantity of blog traffic. The rise of Twitter and other “microblogging” systems helps integrate MABs and single-author blogs into the news media. Blog can also be used as a verb, meaning

1 常用数据库的读写方式A blog (a truncation of “weblog”) is an informational website published on the World Wide Web consisting of discrete, often informal diary-style text entries (posts). Posts are typically displayed in reverse chronological order so that the most recent post appears first, at the top of the web page. Until 2009, blogs were usually the work of a single individual,[citation needed] occasionally of a small group, and often covered a single subject or topic. In the 2010s, “multi-author blogs” (MABs) emerged, featuring the writing of multiple authors and sometimes professionally edited. MABs from newspapers, other media outlets, universities, think tanks, advocacy groups, and similar institutions account for an increasing quantity of blog traffic. The rise of Twitter and other “microblogging” systems helps integrate MABs and single-author blogs into the news media. Blog can also be used as a verb, meaning