apache_beam.io.localfilesystem module

Local File system implementation for accessing files on disk.

class apache_beam.io.localfilesystem.LocalFileSystem(pipeline_options)

Bases: apache_beam.io.filesystem.FileSystem

A Local FileSystem implementation for accessing files on disk.

Parameters:pipeline_options – Instance of PipelineOptions or dict of options and values (like RuntimeValueProvider.runtime_options).

classmethod scheme()

URI scheme for the FileSystem

join(basepath, *paths)

Join two or more pathname components for the filesystem

Parameters:

• basepath – string path of the first component of the path
• paths – path components to be added

Returns: full path after combining all the passed components

split(path)

Splits the given path into two parts.

Splits the path into a pair (head, tail) such that tail contains the last component of the path and head contains everything up to that.

Parameters:path – path as a string Returns:a pair of path components as strings.

mkdirs(path)

Recursively create directories for the provided path.

Parameters:path – string path of the directory structure that should be created Raises:IOError if leaf directory already exists.

has_dirs()

Whether this FileSystem supports directories.

create(path, mime_type='application/octet-stream', compression_type='auto')

Returns a write channel for the given file path.

Parameters:

• path – string path of the file object to be written to the system
• mime_type – MIME type to specify the type of content in the file object
• compression_type – Type of compression to be used for this object

Returns: file handle with a close function for the user to use

open(path, mime_type='application/octet-stream', compression_type='auto')

Returns a read channel for the given file path.

Parameters:

• path – string path of the file object to be written to the system
• mime_type – MIME type to specify the type of content in the file object
• compression_type – Type of compression to be used for this object

Returns: file handle with a close function for the user to use

copy(source_file_names, destination_file_names)

Recursively copy the file tree from the source to the destination

Parameters:

• source_file_names – list of source file objects that needs to be copied
• destination_file_names – list of destination of the new object

Raises:

BeamIOError if any of the copy operations fail

rename(source_file_names, destination_file_names)

Rename the files at the source list to the destination list. Source and destination lists should be of the same size.

Parameters:

• source_file_names – List of file paths that need to be moved
• destination_file_names – List of destination_file_names for the files

Raises:

BeamIOError if any of the rename operations fail

exists(path)

Check if the provided path exists on the FileSystem.

Parameters:path – string path that needs to be checked.

Returns: boolean flag indicating if path exists

size(path)

Get size of path on the FileSystem.

Parameters:path – string path in question.

Returns: int size of path according to the FileSystem.

Raises:BeamIOError if path doesn’t exist.

checksum(path)

Fetch checksum metadata of a file on the FileSystem.

Parameters:path – string path of a file.

Returns: string containing file size.

Raises:BeamIOError if path isn’t a file or doesn’t exist.

delete(paths)

Deletes files or directories at the provided paths. Directories will be deleted recursively.

Parameters:paths – list of paths that give the file objects to be deleted Raises:BeamIOError if any of the delete operations fail