def estimate_size(self, file_name):
try:
logger.info('calling MARS to estimate size for %s' % file_name)
size = None
re_size = re.compile(r'^size=([\d]+);$')
mars_request = create_mars_request(verb='LIST', file_name=file_name)
mars_request.params['OUTPUT'] = 'COST'
logger.debug('mars_request: %s' % mars_request)
log_fn = logger.debug
for rc,fd,l in util.exec_proc([ 'mars' ], logger, stdin=str(mars_request)):
if fd == 2:
log_fn = logger.warn
if l is not None:
log_fn(l.strip())
if size is None and fd == 1 and l is not None:
m = re_size.match(l)
if m:
size = int(m.group(1).replace(",", ""))
assert rc is not None and fd is None and l is None
# don't trust size if mars returns non-zero
if rc != 0 or size is None:
logger.error('failed to compute size, rc = %d' % rc)
logger.error('MARS request was: %s' % mars_request)
raise TaskFailure('failed to compute size, rc = %d' % rc)
elif size == 0:
logger.error('size is %d' % size)
logger.error('MARS request was: %s' % mars_request)
raise HardTaskFailure('size is %d' % size)
est_size = size * config.FILE_SIZE_WEIGHT + config.FILE_SIZE_EXTRA
logger.debug('MARS reported size: %d bytes, after compensating: size * '
'%d + %d = %d' % \
(size, config.FILE_SIZE_WEIGHT, config.FILE_SIZE_EXTRA,
est_size))
logger.info('size is %d' % est_size)
return est_size
except HardTaskFailure:
raise
except Exception, e:
logger.error('estimate_size(file_name=%s) unexpectedly failed (task id '
'%s): %s, retrying in 60 s...' %
(file_name, estimate_size.request.id, str(e)))
raise self.retry(exc=e, countdown=60)
def stage_file(self, file_name, target_dir, path_out):
try:
end_target = os.path.join(target_dir, file_name)
tmp_target = os.path.join(target_dir, uuid.uuid4().get_hex())
logger.info('staging %s' % end_target)
logger.debug('tmp_target: %s' % tmp_target)
mars_request = create_mars_request(verb='RETRIEVE',
file_name=file_name,
target=tmp_target)
logger.debug('mars_request: %s' % mars_request)
with open(path_out, 'w') as f:
for rc,fd,l in util.exec_proc([ 'mars' ], logger, stdin=str(mars_request)):
if fd is not None and l is not None:
if fd == 1:
logger.debug('fd=%s, l=%s' % (fd, l.strip() if l else l))
else:
logger.warning('fd=%s, l=%s' % (fd, l.strip() if l else l))
f.write(l)
f.flush()
f.flush()
os.fdatasync(f.fileno())
f.close()
if rc != 0:
logger.error('failed to stage %s, rc = %d' % (file_name, rc))
logger.error('MARS request was: %s' % mars_request)
logger.debug('removing temp file %s' % tmp_target)
util.unlink(tmp_target) # FIXME: use try...finally
raise TaskFailure('mars returned %d' % rc)
logger.debug('moving temp file %s -> %s' % (tmp_target, end_target))
os.rename(tmp_target, end_target)
logger.info('%s is staged online' % end_target)
logger.debug('=> invoking scheduler')
tasks.scheduler.join_staging_task.delay(stage_file.request.id)
except Exception, e:
logger.error('stage_file(file_name=%s, target_dir=%s, path_out=%s) '
'unexpectedly failed (task id %s): %s, retrying in '
'60 s...' %
(file_name, target_dir, path_out, stage_file.request.id,
str(e)))
raise self.retry(exc=e, countdown=60)
