def _has_event_file_been_skipped(self, missing_event_file_name: str) -> bool: """ Checks if an event file will ever be downloaded. if event_file present --> return False if the worker has written the next event file --> return True if none of the above --> return False :param missing_event_file_name: :return: """ self.logger.info(f" Index Reader: Event File {missing_event_file_name} not found.") missing_worker = parse_worker_name_from_file(missing_event_file_name) missing_step = IndexFileLocationUtils.parse_step_from_index_file_name( missing_event_file_name ) event_files = self.list_event_files(missing_event_file_name) for event_file in event_files: if missing_worker == parse_worker_name_from_file(event_file): step = IndexFileLocationUtils.parse_step_from_index_file_name(event_file) if missing_step == step: """ The missing step file may have been written to disk before we perform the list operation. """ return False self.logger.warn( f" Index Reader: Event File {missing_event_file_name} was written but not found " f"\nHowever Event File {event_file} found." ) self.logger.warn(f"IndexReader: Skipping {missing_event_file_name} ") return True return False
def _update_last_index_token(self, new_index_token: str) -> None: """ This function updates the last_index_token in the following scenarios: 1. last_complete_step >= last_index_token_step : this means that the token isn't pointing to the latest completed step 2. number of steps available ( complete or incomplete ) - (last_completed_step+1) > window_size_limit: we maintain a window to stop querying for older steps that have not completed. if the total number of steps, we are querying for completion is greater than our window_size_limit we update the last_index_token and last_complete_step by (window_size_limit // 2) :param new_index_token: :return:None """ if self.last_index_token is None: last_index_token_step = 0 else: last_index_token_step = IndexFileLocationUtils.parse_step_from_index_file_name( self.last_index_token) # Case 1: This case is not satisfied when all workers in a # distributed training job have not written a step if self.last_complete_step >= last_index_token_step: prefix = IndexFileLocationUtils.get_prefix_from_index_file( new_index_token) # sort lexicographically and select the last worker last_worker = sorted(list(self.worker_set))[-1] # below converts worker_name to serialized workerName # if it's a tf device, else no effect last_worker_serialized = serialize_tf_device(last_worker) self.last_index_token = IndexFileLocationUtils.get_index_key_for_step( prefix, self.last_complete_step, last_worker_serialized) self.logger.debug( f"Updated last index token to:{self.last_index_token}") # Case 2: This case is satisfied if the number of incomplete steps # is greater than the INCOMPLETE_STEP_WAIT_WINDOW available_step = self._global_to_mode.keys() if (len(available_step) - (self.last_complete_step + 1) > self._incomplete_wait_for_step_window): prefix = IndexFileLocationUtils.get_prefix_from_index_file( new_index_token) last_worker = sorted(list(self.worker_set))[-1] # below converts worker_name to serialized workerName # if it's a tf device, else no effect last_worker_serialized = serialize_tf_device(last_worker) self.last_index_token = IndexFileLocationUtils.get_index_key_for_step( prefix, self.last_complete_step + (self._incomplete_wait_for_step_window // 2), last_worker_serialized, ) self.last_complete_step = IndexFileLocationUtils.parse_step_from_index_file_name( self.last_index_token) self.logger.info( f"Waiting for: {len(available_step) - (self.last_complete_step + 1)} Steps. \n" f"INCOMPLETE_STEP_WAIT_WINDOW: {self._incomplete_wait_for_step_window}. \n" f"Marking the last {self._incomplete_wait_for_step_window // 2} incomplete steps as complete" f"Updating last_index_token to: {self.last_index_token}. \n" f"Updating last_complete_step to: {self.last_complete_step}. ")
def read_index_files( self, start_after_key: str, range_steps=None ) -> Tuple[List[bytes], list, str, List[str]]: """ Read files like `trial_{datetime}/index/000/{step}_{worker}.json. :param start_after_key: str :param range_steps: str :return: Tuple( responses, steps, start_after_key, workers) """ index_files = self.list_index_files() steps = [] workers = [] responses = [] if start_after_key is not None: start_after_index = bisect_left(index_files, start_after_key) else: start_after_index = 0 index_files = index_files[start_after_index:] # ignore files we have already read for index_file in index_files: if self.index_file_cache.has_not_read(index_file): step = IndexFileLocationUtils.parse_step_from_index_file_name(index_file) if ( range_steps is not None and step_in_range(range_steps, step) ) or range_steps is None: steps.append(step) workers.append(parse_worker_name_from_file(index_file)) self.logger.debug( f"Sagemaker-Debugger: Read {os.path.getsize(index_file)} bytes from file {index_file}" ) with open(index_file) as f: responses.append(f.read().encode()) self.index_file_cache.add(index_file, start_after_key) if len(index_files) > 0: start_after_key = index_files[-1] # Last file that we have read return responses, steps, start_after_key, workers
def read_index_files( self, start_after_key: str, range_steps=None ) -> Tuple[List[bytes], list, str, List[str]]: """ Read files like `trial_{datetime}/index/000/{step}_{worker}.json. :param start_after_key: str :param range_steps: :return: Tuple( responses, steps, start_after_key, workers) """ object_requests = [] steps = [] workers = [] index_files, start_after_key = self.list_index_files(start_after_key) self.logger.debug(f'Loaded Index Files: {",".join(index_files)}') for index_file in index_files: if self.index_file_cache.has_not_read(index_file): step = IndexFileLocationUtils.parse_step_from_index_file_name(index_file) if ( range_steps is not None and step_in_range(range_steps, step) ) or range_steps is None: steps.append(step) workers.append(parse_worker_name_from_file(index_file)) object_requests.append( ReadObjectRequest(format(f"s3://{self.bucket_name}/") + index_file) ) self.index_file_cache.add(index_file, start_after_key) responses = self.s3_handler.get_objects(object_requests) return responses, steps, start_after_key, workers