Fix concurrent script loading with force_redownload (#6718)

* fix concurrent script loading with force_redownload

* support various dynamic modules paths

* fix test

* fix tests

* disable on windows

* Update tests/test_load.py

Co-authored-by: Mario Šaško <[email protected]>

---------

Co-authored-by: Mario Šaško <[email protected]>

src/datasets/load.py

@@ -27,6 +27,7 @@
 import time
 import warnings
 from collections import Counter
+from contextlib import nullcontext
 from dataclasses import dataclass, field
 from pathlib import Path
 from typing import Any, Dict, List, Mapping, Optional, Sequence, Tuple, Type, Union
@@ -70,7 +71,6 @@
 )
 from .splits import Split
 from .utils import _datasets_server
-from .utils._filelock import FileLock
 from .utils.deprecation_utils import deprecated
 from .utils.file_utils import (
     OfflineModeIsEnabled,
@@ -87,7 +87,7 @@
 from .utils.info_utils import VerificationMode, is_small_dataset
 from .utils.logging import get_logger
 from .utils.metadata import MetadataConfigs
-from .utils.py_utils import get_imports
+from .utils.py_utils import get_imports, lock_importable_file
 from .utils.version import Version
 
 
@@ -244,7 +244,10 @@ def __reduce__(self):  # to make dynamically created class pickable, see _Initia
 def get_dataset_builder_class(
     dataset_module: "DatasetModule", dataset_name: Optional[str] = None
 ) -> Type[DatasetBuilder]:
-    builder_cls = import_main_class(dataset_module.module_path)
+    with lock_importable_file(
+        dataset_module.importable_file_path
+    ) if dataset_module.importable_file_path else nullcontext():
+        builder_cls = import_main_class(dataset_module.module_path)
     if dataset_module.builder_configs_parameters.builder_configs:
         dataset_name = dataset_name or dataset_module.builder_kwargs.get("dataset_name")
         if dataset_name is None:
@@ -375,17 +378,15 @@ def _copy_script_and_other_resources_in_importable_dir(
         download_mode (Optional[Union[DownloadMode, str]]): download mode
 
     Return:
-        importable_local_file: path to an importable module with importlib.import_module
+        importable_file: path to an importable module with importlib.import_module
     """
-
     # Define a directory with a unique name in our dataset or metric folder
     # path is: ./datasets|metrics/dataset|metric_name/hash_from_code/script.py
     # we use a hash as subdirectory_name to be able to have multiple versions of a dataset/metric processing file together
     importable_subdirectory = os.path.join(importable_directory_path, subdirectory_name)
-    importable_local_file = os.path.join(importable_subdirectory, name + ".py")
+    importable_file = os.path.join(importable_subdirectory, name + ".py")
     # Prevent parallel disk operations
-    lock_path = importable_directory_path + ".lock"
-    with FileLock(lock_path):
+    with lock_importable_file(importable_file):
         # Create main dataset/metrics folder if needed
         if download_mode == DownloadMode.FORCE_REDOWNLOAD and os.path.exists(importable_directory_path):
             shutil.rmtree(importable_directory_path)
@@ -406,13 +407,13 @@ def _copy_script_and_other_resources_in_importable_dir(
                 pass
 
         # Copy dataset.py file in hash folder if needed
-        if not os.path.exists(importable_local_file):
-            shutil.copyfile(original_local_path, importable_local_file)
+        if not os.path.exists(importable_file):
+            shutil.copyfile(original_local_path, importable_file)
         # Record metadata associating original dataset path with local unique folder
         # Use os.path.splitext to split extension from importable_local_file
-        meta_path = os.path.splitext(importable_local_file)[0] + ".json"
+        meta_path = os.path.splitext(importable_file)[0] + ".json"
         if not os.path.exists(meta_path):
-            meta = {"original file path": original_local_path, "local file path": importable_local_file}
+            meta = {"original file path": original_local_path, "local file path": importable_file}
             # the filename is *.py in our case, so better rename to filename.json instead of filename.py.json
             with open(meta_path, "w", encoding="utf-8") as meta_file:
                 json.dump(meta, meta_file)
@@ -437,7 +438,7 @@ def _copy_script_and_other_resources_in_importable_dir(
                 original_path, destination_additional_path
             ):
                 shutil.copyfile(original_path, destination_additional_path)
-        return importable_local_file
+        return importable_file
 
 
 def _get_importable_file_path(
@@ -447,7 +448,7 @@ def _get_importable_file_path(
     name: str,
 ) -> str:
     importable_directory_path = os.path.join(dynamic_modules_path, module_namespace, name.replace("/", "--"))
-    return os.path.join(importable_directory_path, subdirectory_name, name + ".py")
+    return os.path.join(importable_directory_path, subdirectory_name, name.split("/")[-1] + ".py")
 
 
 def _create_importable_file(
@@ -692,6 +693,7 @@ class DatasetModule:
     builder_kwargs: dict
     builder_configs_parameters: BuilderConfigsParameters = field(default_factory=BuilderConfigsParameters)
     dataset_infos: Optional[DatasetInfosDict] = None
+    importable_file_path: Optional[str] = None
 
 
 @dataclass
@@ -983,7 +985,7 @@ def get_module(self) -> DatasetModule:
         # make the new module to be noticed by the import system
         importlib.invalidate_caches()
         builder_kwargs = {"base_path": str(Path(self.path).parent)}
-        return DatasetModule(module_path, hash, builder_kwargs)
+        return DatasetModule(module_path, hash, builder_kwargs, importable_file_path=importable_file_path)
 
 
 class LocalDatasetModuleFactoryWithoutScript(_DatasetModuleFactory):
@@ -1536,7 +1538,7 @@ def get_module(self) -> DatasetModule:
             "base_path": hf_hub_url(self.name, "", revision=self.revision).rstrip("/"),
             "repo_id": self.name,
         }
-        return DatasetModule(module_path, hash, builder_kwargs)
+        return DatasetModule(module_path, hash, builder_kwargs, importable_file_path=importable_file_path)
 
 
 class CachedDatasetModuleFactory(_DatasetModuleFactory):
@@ -1582,21 +1584,24 @@ def _get_modification_time(module_hash):
             if not config.HF_DATASETS_OFFLINE:
                 warning_msg += ", or remotely on the Hugging Face Hub."
             logger.warning(warning_msg)
-            # make the new module to be noticed by the import system
-            module_path = ".".join(
-                [
-                    os.path.basename(dynamic_modules_path),
-                    "datasets",
-                    self.name.replace("/", "--"),
-                    hash,
-                    self.name.split("/")[-1],
-                ]
+            importable_file_path = _get_importable_file_path(
+                dynamic_modules_path=dynamic_modules_path,
+                module_namespace="datasets",
+                subdirectory_name=hash,
+                name=self.name,
+            )
+            module_path, hash = _load_importable_file(
+                dynamic_modules_path=dynamic_modules_path,
+                module_namespace="datasets",
+                subdirectory_name=hash,
+                name=self.name,
             )
+            # make the new module to be noticed by the import system
             importlib.invalidate_caches()
             builder_kwargs = {
                 "repo_id": self.name,
             }
-            return DatasetModule(module_path, hash, builder_kwargs)
+            return DatasetModule(module_path, hash, builder_kwargs, importable_file_path=importable_file_path)
         cache_dir = os.path.expanduser(str(self.cache_dir or config.HF_DATASETS_CACHE))
         cached_datasets_directory_path_root = os.path.join(cache_dir, self.name.replace("/", "___"))
         cached_directory_paths = [

src/datasets/streaming.py

@@ -31,7 +31,7 @@
 )
 from .utils.logging import get_logger
 from .utils.patching import patch_submodule
-from .utils.py_utils import get_imports
+from .utils.py_utils import get_imports, lock_importable_file
 
 
 logger = get_logger(__name__)
@@ -120,11 +120,13 @@ def extend_dataset_builder_for_streaming(builder: "DatasetBuilder"):
     extend_module_for_streaming(builder.__module__, download_config=download_config)
     # if needed, we also have to extend additional internal imports (like wmt14 -> wmt_utils)
     if not builder.__module__.startswith("datasets."):  # check that it's not a packaged builder like csv
-        for imports in get_imports(inspect.getfile(builder.__class__)):
-            if imports[0] == "internal":
-                internal_import_name = imports[1]
-                internal_module_name = ".".join(builder.__module__.split(".")[:-1] + [internal_import_name])
-                extend_module_for_streaming(internal_module_name, download_config=download_config)
+        importable_file = inspect.getfile(builder.__class__)
+        with lock_importable_file(importable_file):
+            for imports in get_imports(importable_file):
+                if imports[0] == "internal":
+                    internal_import_name = imports[1]
+                    internal_module_name = ".".join(builder.__module__.split(".")[:-1] + [internal_import_name])
+                    extend_module_for_streaming(internal_module_name, download_config=download_config)
 
     # builders can inherit from other builders that might use streaming functionality
     # (for example, ImageFolder and AudioFolder inherit from FolderBuilder which implements examples generation)

src/datasets/utils/py_utils.py

@@ -27,6 +27,7 @@
 from contextlib import contextmanager
 from dataclasses import fields, is_dataclass
 from multiprocessing import Manager
+from pathlib import Path
 from queue import Empty
 from shutil import disk_usage
 from typing import Any, Callable, Dict, Iterable, List, Optional, Set, Tuple, TypeVar, Union
@@ -47,6 +48,7 @@
     dumps,
     pklregister,
 )
+from ._filelock import FileLock
 
 
 try:  # pragma: no branch
@@ -537,6 +539,15 @@ def _convert_github_url(url_path: str) -> Tuple[str, Optional[str]]:
     return url_path, sub_directory
 
 
+def lock_importable_file(importable_local_file: str) -> FileLock:
+    # Check the directory with a unique name in our dataset folder
+    # path is: ./datasets/dataset_name/hash_from_code/script.py
+    # we use a hash as subdirectory_name to be able to have multiple versions of a dataset/metric processing file together
+    importable_directory_path = str(Path(importable_local_file).resolve().parent.parent)
+    lock_path = importable_directory_path + ".lock"
+    return FileLock(lock_path)
+
+
 def get_imports(file_path: str) -> Tuple[str, str, str, str]:
     """Find whether we should import or clone additional files for a given processing script.
         And list the import.

tests/test_load.py

@@ -54,6 +54,7 @@
     assert_arrow_memory_doesnt_increase,
     assert_arrow_memory_increases,
     offline,
+    require_not_windows,
     require_pil,
     require_sndfile,
     set_current_working_directory_to_temp_dir,
@@ -1674,6 +1675,28 @@ def test_load_dataset_distributed(tmp_path, csv_path):
         assert all(dataset.cache_files == datasets[0].cache_files for dataset in datasets)
 
 
+def distributed_load_dataset_with_script(args):
+    data_name, tmp_dir, download_mode = args
+    dataset = load_dataset(data_name, cache_dir=tmp_dir, download_mode=download_mode)
+    return dataset
+
+
+@require_not_windows  # windows doesn't support overwriting Arrow files from other processes
+@pytest.mark.parametrize("download_mode", [None, "force_redownload"])
+def test_load_dataset_distributed_with_script(tmp_path, download_mode):
+    # we need to check in the "force_redownload" case
+    # since in `_copy_script_and_other_resources_in_importable_dir()` we might delete the directory
+    # containing the .py file while the other processes use it
+    num_workers = 5
+    args = (SAMPLE_DATASET_IDENTIFIER, str(tmp_path), download_mode)
+    with Pool(processes=num_workers) as pool:  # start num_workers processes
+        datasets = pool.map(distributed_load_dataset_with_script, [args] * num_workers)
+        assert len(datasets) == num_workers
+        assert all(len(dataset) == len(datasets[0]) > 0 for dataset in datasets)
+        assert len(datasets[0].cache_files) > 0
+        assert all(dataset.cache_files == datasets[0].cache_files for dataset in datasets)
+
+
 def test_load_dataset_with_storage_options(mockfs):
     with mockfs.open("data.txt", "w") as f:
         f.write("Hello there\n")