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import os
import time
import shutil
import logging
import subprocess
import os.path as op
from typing import List
from collections import OrderedDict
import torch.distributed as distributed
logger = logging.getLogger(__name__)
DEFAULT_AZCOPY_PATH = 'azcopy/azcopy'
def disk_usage(path: str) -> float:
stat = shutil.disk_usage(path)
return stat.used / stat.total
def is_download_successful(stdout: str) -> bool:
for line in stdout.split('\n'):
if line == "Number of Transfers Failed: 0":
return True
logger.info("Azcopy message:\n %s" % stdout)
return False
def ensure_directory(path):
"""Check existence of the given directory path. If not, create a new directory.
Args:
path (str): path of a given directory.
"""
if path == '' or path == '.':
return
if path is not None and len(path) > 0:
assert not op.isfile(path), '{} is a file'.format(path)
if not op.exists(path) and not op.islink(path):
os.makedirs(path, exist_ok=True)
# we should always check if it succeeds.
assert op.isdir(op.abspath(path)), path
class LRU(OrderedDict):
def __init__(self, maxsize=3):
self.maxsize = maxsize
def __getitem__(self, key):
value = super().__getitem__(key)
self.move_to_end(key)
return value
def __setitem__(self, key, value):
if key in self:
if self[key] is not None:
self[key].close()
self.move_to_end(key)
logger.debug('=> Cache {}'.format(key))
super().__setitem__(key, value)
if len(self) > self.maxsize:
oldest = next(iter(self))
if self[oldest] is not None:
self[oldest].close()
logger.debug('=> Purged {}'.format(oldest))
del self[oldest]
class BlobStorage(OrderedDict):
""" Pseudo Blob Storage manager
The registered blobs are maintained in a LRU cache.
Limit size, evicting the least recently looked-up key when full.
https://docs.python.org/3/library/collections.html#collections.OrderedDict
Input argument:
sas_token (str): path to SAS token.
"""
def __init__(self,
is_train: bool,
sas_token_path: str = None,
azcopy_path: str = None,
*args, **kwds):
super().__init__(*args, **kwds)
self.maxsize = 2 if is_train else 10 # Set maxsize to large number such val data never get purged.
self.is_train = is_train
if sas_token_path:
self.sas_token = BlobStorage.read_sas_token(sas_token_path)
self.base_url = self.sas_token[:self.sas_token.index("?")]
self.query_string = self.sas_token[self.sas_token.index("?"):]
self.container = BlobStorage.extract_container(self.sas_token)
else:
self.sas_token = None
self.base_url = None
self.query_string = None
self.container = None
logger.debug(
f"=> [BlobStorage] Base url: {self.base_url}"
f"=> [BlobStorage] Query string: {self.query_string}"
f"=> [BlobStorage] Container name: {self.container}"
)
self.azcopy_path = azcopy_path if azcopy_path else DEFAULT_AZCOPY_PATH
self._cached_files = LRU(3)
def __getitem__(self, key):
value = super().__getitem__(key)
self.move_to_end(key)
return value
def __setitem__(self, key, value):
if key in self:
self.move_to_end(key)
super().__setitem__(key, value)
# NOTE: purge the least recently used data if the disk usage is high.
# ITP restarts GPU clusters when disk usage reaches 80%.
if len(self) > self.maxsize:
oldest = next(iter(self))
del self[oldest]
@staticmethod
def read_sas_token(path: str) -> str:
with open(path, 'r') as f:
token = f.readline().strip()
return token
@staticmethod
def extract_container(token: str) -> str:
"""
Input argument:
token (str): the full URI of Shared Access Signature (SAS) in the following format.
https://[storage_account].blob.core.windows.net/[container_name][SAS_token]
"""
return os.path.basename(token.split('?')[0])
def _convert_to_blob_url(self, local_path: str):
return self.base_url + local_path.split("azcopy")[1] + self.query_string
def _convert_to_blob_folder_url(self, local_path: str):
return self.base_url + local_path.split("azcopy")[1] + "/*" + self.query_string
def fetch_blob(self, local_path: str) -> None:
if op.exists(local_path):
logger.info('=> Try to open {}'.format(local_path))
fp = open(local_path, 'r')
self._cached_files[local_path] = fp
logger.debug("=> %s downloaded. Skip." % local_path)
return
blob_url = self._convert_to_blob_url(local_path)
rank = '0' if 'RANK' not in os.environ else os.environ['RANK']
cmd = [self.azcopy_path, "copy", blob_url, local_path + rank]
curr_usage = disk_usage('/')
logger.info(
"=> Downloading %s with azcopy ... (disk usage: %.2f%%)"
% (local_path, curr_usage * 100)
)
proc = subprocess.run(cmd, stdout=subprocess.PIPE)
while not is_download_successful(proc.stdout.decode()):
logger.info("=> Azcopy failed to download {}. Retrying ...".format(blob_url))
proc = subprocess.run(cmd, stdout=subprocess.PIPE)
if not op.exists(local_path):
os.rename(local_path + rank, local_path)
else:
os.remove(local_path + rank)
logger.info(
"=> Downloaded %s with azcopy ... (disk usage: %.2f%% => %.2f%%)" %
(local_path, curr_usage * 100, disk_usage('/') * 100)
)
def fetch_blob_folder(self, local_path: str, azcopy_args: list=[]) -> None:
blob_url = self._convert_to_blob_folder_url(local_path)
cmd = [self.azcopy_path, "copy", blob_url, local_path] + azcopy_args
curr_usage = disk_usage('/')
logger.info(
"=> Downloading %s with azcopy args %s ... (disk usage: %.2f%%)"
% (local_path, ' '.join(azcopy_args), curr_usage * 100)
)
proc = subprocess.run(cmd, stdout=subprocess.PIPE)
while not is_download_successful(proc.stdout.decode()):
logger.info("=> Azcopy failed to download {} with args {}. Retrying ...".format(blob_url, ' '.join(azcopy_args)))
proc = subprocess.run(cmd, stdout=subprocess.PIPE)
logger.info(
"=> Downloaded %s with azcopy args %s ... (disk usage: %.2f%% => %.2f%%)" %
(local_path, ' '.join(azcopy_args), curr_usage * 100, disk_usage('/') * 100)
)
def register_local_tsv_paths(self, local_paths: List[str]) -> List[str]:
if self.sas_token:
tsv_paths_new = []
lineidx_paths = set()
linelist_paths = set()
for path in local_paths:
tsv_path_az = path.replace(self.container, 'azcopy')
tsv_paths_new.append(tsv_path_az)
logger.debug("=> Registering {}".format(tsv_path_az))
if not self.is_train:
logger.info('=> Downloading {}...'.format(tsv_path_az))
self.fetch_blob(tsv_path_az)
logger.info('=> Downloaded {}'.format(tsv_path_az))
lineidx = op.splitext(path)[0] + '.lineidx'
lineidx_ = lineidx.replace(self.container, 'azcopy')
if self.is_train:
if not op.isfile(lineidx_) and op.dirname(lineidx_) not in lineidx_paths:
lineidx_paths.add(op.dirname(lineidx_))
else:
if not op.isfile(lineidx_):
ensure_directory(op.dirname(lineidx_))
self.fetch_blob(lineidx_)
linelist = op.splitext(path)[0] + '.linelist'
linelist_ = linelist.replace(self.container, 'azcopy')
# .linelist does not always exist. Check existence before fetch
if self.is_train:
if op.isfile(linelist) and not op.isfile(linelist_) and op.dirname(linelist_) not in linelist_paths:
linelist_paths.add(op.dirname(linelist_))
else:
if op.isfile(linelist) and not op.isfile(linelist_):
ensure_directory(op.dirname(linelist_))
self.fetch_blob(linelist_)
if self.is_train:
for path in lineidx_paths:
self.fetch_blob_folder(path, azcopy_args=['--include-pattern', '*.lineidx'])
for path in linelist_paths:
self.fetch_blob_folder(path, azcopy_args=['--include-pattern', '*.linelist'])
return tsv_paths_new
else:
return local_paths
def open(self, local_path: str):
if self.sas_token and 'azcopy' in local_path:
while not op.exists(local_path):
time.sleep(1)
fid = open(local_path, 'r')
return fid
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