The name of the default file system. A URI whose scheme and authority determine the FileSystem implementation. The uri's scheme determines the config property (fs.SCHEME.impl)
naming the FileSystem implementation class. The uri's authority is used to determine the host, port, etc. for a filesystem.
Determines where on the local filesystem the DFS name node should store the name table(fsimage). If this is a comma-delimited list of directories then the name table is
replicated in all of the directories, for redundancy.
Determines where on the local filesystem an DFS data node should store its blocks. If this is a comma-delimited list of directories, then data will be stored in all named
directories, typically on different devices. Directories that do not exist are ignored.