Add disk usage check before downloading files

.github/workflows/ci-tests-data.yml

@@ -95,6 +95,7 @@ jobs:
       - name: Testing Data
         working-directory: tests/tests_data
         # NOTE: do not include coverage report here, see: https://github.com/nedbat/coveragepy/issues/1003
+        timeout-minutes: 10
         run: |
           python -m coverage run --source lightning \
             -m pytest -v --timeout=60 --durations=60

src/lightning/data/streaming/data_processor.py

@@ -1,6 +1,7 @@
 import json
 import logging
 import os
+import shutil
 import signal
 import tempfile
 import traceback
@@ -10,7 +11,6 @@
 from datetime import datetime
 from multiprocessing import Process, Queue
 from queue import Empty
-from shutil import copyfile, rmtree
 from time import sleep, time
 from typing import Any, Dict, List, Optional, Tuple, TypeVar, Union
 from urllib import parse
@@ -101,6 +101,16 @@ def _wait_for_file_to_exist(s3: S3Client, obj: parse.ParseResult, sleep_time: in
                 raise e
 
 
+def _wait_for_disk_usage_higher_than_threshold(input_dir: str, threshold_in_gb: int = 25, sleep_time: int = 3) -> None:
+    usage = shutil.disk_usage(input_dir)
+
+    while (usage.free / 1000 / 1000 / 1000) <= threshold_in_gb:
+        sleep(sleep_time)
+        usage = shutil.disk_usage(input_dir)
+
+    return
+
+
 def _download_data_target(input_dir: Dir, cache_dir: str, queue_in: Queue, queue_out: Queue) -> None:
     """This function is used to download data from a remote directory to a cache directory to optimise reading."""
     s3 = S3Client()
@@ -123,7 +133,11 @@ def _download_data_target(input_dir: Dir, cache_dir: str, queue_in: Queue, queue
             continue
 
         if input_dir.url is not None or input_dir.path is not None:
-            # 6. Download all the required paths to unblock the current index
+            if input_dir.url:
+                # 6. Wait for the removers to catch up when we are downloading data.
+                _wait_for_disk_usage_higher_than_threshold("/", 25)
+
+            # 7. Download all the required paths to unblock the current index
             for path in paths:
                 local_path = path.replace(input_dir.path, cache_dir)
 
@@ -141,7 +155,7 @@ def _download_data_target(input_dir: Dir, cache_dir: str, queue_in: Queue, queue
                         s3.client.download_fileobj(obj.netloc, obj.path.lstrip("/"), f)
 
                 elif os.path.isfile(path):
-                    copyfile(path, local_path)
+                    shutil.copyfile(path, local_path)
                 else:
                     raise ValueError(f"The provided {input_dir.url} isn't supported.")
 
@@ -198,7 +212,7 @@ def _upload_fn(upload_queue: Queue, remove_queue: Queue, cache_dir: str, output_
             except Exception as e:
                 print(e)
         elif os.path.isdir(output_dir.path):
-            copyfile(local_filepath, os.path.join(output_dir.path, os.path.basename(local_filepath)))
+            shutil.copyfile(local_filepath, os.path.join(output_dir.path, os.path.basename(local_filepath)))
         else:
             raise ValueError(f"The provided {output_dir.path} isn't supported.")
 
@@ -686,7 +700,7 @@ def _upload_index(self, output_dir: Dir, cache_dir: str, num_nodes: int, node_ra
                 local_filepath, obj.netloc, os.path.join(obj.path.lstrip("/"), os.path.basename(local_filepath))
             )
         elif os.path.isdir(output_dir.path):
-            copyfile(local_filepath, os.path.join(output_dir.path, os.path.basename(local_filepath)))
+            shutil.copyfile(local_filepath, os.path.join(output_dir.path, os.path.basename(local_filepath)))
 
         if num_nodes == 1 or node_rank is None:
             return
@@ -707,7 +721,7 @@ def _upload_index(self, output_dir: Dir, cache_dir: str, num_nodes: int, node_ra
                     with open(node_index_filepath, "wb") as f:
                         s3.client.download_fileobj(obj.netloc, obj.path.lstrip("/"), f)
                 elif os.path.isdir(output_dir.path):
-                    copyfile(remote_filepath, node_index_filepath)
+                    shutil.copyfile(remote_filepath, node_index_filepath)
 
             merge_cache = Cache(cache_dir, chunk_bytes=1)
             merge_cache._merge_no_wait()
@@ -948,15 +962,15 @@ def _cleanup_cache(self) -> None:
 
         # Cleanup the cache dir folder to avoid corrupted files from previous run to be there.
         if os.path.exists(cache_dir):
-            rmtree(cache_dir, ignore_errors=True)
+            shutil.rmtree(cache_dir, ignore_errors=True)
 
         os.makedirs(cache_dir, exist_ok=True)
 
         cache_data_dir = _get_cache_data_dir()
 
         # Cleanup the cache data folder to avoid corrupted files from previous run to be there.
         if os.path.exists(cache_data_dir):
-            rmtree(cache_data_dir, ignore_errors=True)
+            shutil.rmtree(cache_data_dir, ignore_errors=True)
 
         os.makedirs(cache_data_dir, exist_ok=True)
 

tests/tests_data/streaming/test_data_processor.py

@@ -21,6 +21,7 @@
     _map_items_to_workers_weighted,
     _remove_target,
     _upload_fn,
+    _wait_for_disk_usage_higher_than_threshold,
     _wait_for_file_to_exist,
 )
 from lightning.data.streaming.functions import LambdaDataTransformRecipe, map, optimize
@@ -159,6 +160,7 @@ def fn(*_, **__):
 
 
 @pytest.mark.skipif(condition=sys.platform == "win32", reason="Not supported on windows")
+@mock.patch("lightning.data.streaming.data_processor._wait_for_disk_usage_higher_than_threshold")
 def test_download_data_target(tmpdir):
     input_dir = os.path.join(tmpdir, "input_dir")
     os.makedirs(input_dir, exist_ok=True)
@@ -193,6 +195,13 @@ def fn(*_, **__):
     assert os.listdir(cache_dir) == ["a.txt"]
 
 
+def test_wait_for_disk_usage_higher_than_threshold():
+    disk_usage_mock = mock.Mock(side_effect=[mock.Mock(free=10e9), mock.Mock(free=10e9), mock.Mock(free=10e11)])
+    with mock.patch("lightning.data.streaming.data_processor.shutil.disk_usage", disk_usage_mock):
+        _wait_for_disk_usage_higher_than_threshold("/", 10, sleep_time=0)
+    assert disk_usage_mock.call_count == 3
+
+
 @pytest.mark.skipif(condition=sys.platform == "win32", reason="Not supported on windows")
 def test_wait_for_file_to_exist():
     import botocore