PermissionError when writing to larger zarr array #597

Code to reproduce

points = zarr.open('data/points.zarr', mode='w', shape=(10000, 20000, 3), dtype=np.uint8, chunks=(10000, 1, 3))

for col in range(0, 20000):
    for row in range(0, 10000):
        points[row, col] = 50, 100, 150

Problem description

When I run the above code snippet I get a PermissionError, even when running as administrator. This doesn't happen for smaller zarr arrays e.g. shape=(100, 200, 3)

Traceback (most recent call last): File "<stdin>", line 3, in <module> File "C:\UserPath\AppData\Roaming\Python\Python38\site-packages\zarr\core.py", line 1115, in __setitem__ self.set_basic_selection(selection, value, fields=fields) File "C:\UserPath\AppData\Roaming\Python\Python38\site-packages\zarr\core.py", line 1210, in set_basic_selection return self._set_basic_selection_nd(selection, value, fields=fields) File "C:\UserPath\AppData\Roaming\Python\Python38\site-packages\zarr\core.py", line 1501, in _set_basic_selection_nd self._set_selection(indexer, value, fields=fields) File "C:\UserPath\AppData\Roaming\Python\Python38\site-packages\zarr\core.py", line 1550, in _set_selection self._chunk_setitem(chunk_coords, chunk_selection, chunk_value, fields=fields) File "C:\UserPath\AppData\Roaming\Python\Python38\site-packages\zarr\core.py", line 1664, in _chunk_setitem self._chunk_setitem_nosync(chunk_coords, chunk_selection, value, File "C:\UserPath\AppData\Roaming\Python\Python38\site-packages\zarr\core.py", line 1729, in _chunk_setitem_nosync self.chunk_store[ckey] = cdata File "C:\UserPath\AppData\Roaming\Python\Python38\site-packages\zarr\storage.py", line 825, in __setitem__ replace(temp_path, file_path) PermissionError: [WinError 5] Access is denied: 'C:\\UserPath\\DataPath\\data\\points.zarr\\0.0.0.fca098bcac1b4eb6a62733dc4f2d6966.partial' -> 'C:\\UserPath\\DataPath\\data\\points.zarr\\0.0.0'

Version and installation information

• Value of zarr.__version__ == 2.4.0
• Value of numcodecs.__version__ == 0.6.4
• Version of Python interpreter == Python 3.8.3
• Operating system (Linux/Windows/Mac) == Windows
• Zarr was installed using pip