pyarrow.cuda.BufferWriter

class pyarrow.cuda.BufferWriter

Bases: pyarrow.lib.NativeFile

File interface for writing to CUDA buffers.

By default writes are unbuffered. Use set_buffer_size to enable buffering.

__init__()

Initialize self. See help(type(self)) for accurate signature.

Methods

__init__()	Initialize self.
close(self)
download(self, stream_or_path[, buffer_size])	Read file completely to local path (rather than reading completely into memory).
fileno(self)	NOT IMPLEMENTED
flush(self)	Flush the buffer stream
isatty(self)
metadata(self)	Return file metadata
read(self[, nbytes])	Read indicated number of bytes from file, or read all remaining bytes if no argument passed
read1(self[, nbytes])	Read and return up to n bytes.
read_at(self, nbytes, offset)	Read indicated number of bytes at offset from the file
read_buffer(self[, nbytes])
readable(self)
readall(self)
readinto(self, b)	Read into the supplied buffer
readline(self[, size])	NOT IMPLEMENTED.
readlines(self[, hint])	NOT IMPLEMENTED.
seek(self, int64_t position, int whence=0)
seekable(self)
size(self)	Return file size
tell(self)	Return current stream position
truncate(self)	NOT IMPLEMENTED
upload(self, stream[, buffer_size])	Pipe file-like object to file
writable(self)
write(self, data)	Write byte from any object implementing buffer protocol (bytes, bytearray, ndarray, pyarrow.Buffer)
writeat(self, int64_t position, data)	Write data to buffer starting from position.
writelines(self, lines)

Attributes

buffer_size	Returns size of host (CPU) buffer, 0 for unbuffered
closed
mode	The file mode.
num_bytes_buffered	Returns number of bytes buffered on host

buffer_size

Returns size of host (CPU) buffer, 0 for unbuffered

close(self)

closed

download(self, stream_or_path, buffer_size=None)

Read file completely to local path (rather than reading completely into memory). First seeks to the beginning of the file.

fileno(self)

NOT IMPLEMENTED

flush(self)

Flush the buffer stream

isatty(self)

metadata(self)

Return file metadata

mode

The file mode. Currently instances of NativeFile may support:

• rb: binary read

• wb: binary write

• rb+: binary read and write

num_bytes_buffered

Returns number of bytes buffered on host

read(self, nbytes=None)

Read indicated number of bytes from file, or read all remaining bytes if no argument passed

Parameters

nbytes (int, default None) –

Returns

data (bytes)

read1(self, nbytes=None)

Read and return up to n bytes.

Alias for read, needed to match the IOBase interface.

read_at(self, nbytes, offset)

Read indicated number of bytes at offset from the file

Parameters

• nbytes (int) –

• offset (int) –

Returns

data (bytes)

read_buffer(self, nbytes=None)

readable(self)

readall(self)

readinto(self, b)

Read into the supplied buffer

Parameters

b (any python object supporting buffer interface) –

Returns

number of bytes written

readline(self, size=None)

NOT IMPLEMENTED. Read and return a line of bytes from the file.

If size is specified, read at most size bytes.

Line terminator is always b”n”.

readlines(self, hint=None)

NOT IMPLEMENTED. Read lines of the file

Parameters

hint (int maximum number of bytes read until we stop) –

seek(self, int64_t position, int whence=0)

seekable(self)

size(self)

Return file size

tell(self)

Return current stream position

truncate(self)

NOT IMPLEMENTED

upload(self, stream, buffer_size=None)

Pipe file-like object to file

writable(self)

write(self, data)

Write byte from any object implementing buffer protocol (bytes, bytearray, ndarray, pyarrow.Buffer)

Parameters

data (bytes-like object or exporter of buffer protocol) –

Returns

nbytes (number of bytes written)

writeat(self, int64_t position, data)

Write data to buffer starting from position.

Parameters

• position (int) – Specify device buffer position where the data will be written.

• data (array-like) – Specify data, the data instance must implement buffer protocol.

writelines(self, lines)

pyarrow.cuda.BufferReader pyarrow.cuda.serialize_record_batch