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What is the relationship between HDFS and the local file system:

HDFS is built on the local file system, and HDFS stores data by manipulating the local file system.

Hadoop is a layer of abstraction on the existing file system, but not all local file system.

In order to provide consistent interfaces to different data access, hadoop draws lessons from the concept of virtual file system of Linux, introduces Hadoop abstract file system, and provides a large number of concrete implementations. HDFS is one of the implementations.

Amazon S3 system, FTP (network), webhdfs (network), ramfs (memory), har, and so on, are all implementations of this abstract file system.

Hdfs is an abstraction of a higher-level file system, which regards a file system composed of multiple machines as a logical whole.

You can see fdisk-l, but it is its own file system, which is hdfs. You can't see it locally from linux. If you want to see the files in it, you can use the following command hadoop fs-ls.

Fdisk-l view hard disk and partition information

Hadoop fs-ls / View the directory information under the current hdfs

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