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Description
Zarr version
main@94983362f06f9bb4be3f04562b179549e36a87c4
Numcodecs version
0.16.2
Python Version
3.12.9
Operating System
Mac
Installation
uv
Description
I was trying to test#3369 for a project using titiler-multidim together with@maxrjones earlier, and ran into this issue.
I wrote out a native zarr v3 dataset (I believe it was using v3.0.8) on the NASA veda hub and downloaded it locally for testing. When I am trying to read that in with the newest version or the main branch I get the following error:
Traceback (most recent call last): File "/Users/juliusbusecke/Code/titiler-multidim/temp_dont_commit/mre_object_has_no_attr_value.py", line 19, in <module> ds = xr.open_dataset( ^^^^^^^^^^^^^^^^ File "/Users/juliusbusecke/.cache/uv/environments-v2/mre-object-has-no-attr-value-cd1317b944d0d9b9/lib/python3.12/site-packages/xarray/backends/api.py", line 679, in open_dataset backend_ds = backend.open_dataset( ^^^^^^^^^^^^^^^^^^^^^ File "/Users/juliusbusecke/.cache/uv/environments-v2/mre-object-has-no-attr-value-cd1317b944d0d9b9/lib/python3.12/site-packages/xarray/backends/zarr.py", line 1581, in open_dataset ds = store_entrypoint.open_dataset( ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/juliusbusecke/.cache/uv/environments-v2/mre-object-has-no-attr-value-cd1317b944d0d9b9/lib/python3.12/site-packages/xarray/backends/store.py", line 44, in open_dataset vars, attrs = filename_or_obj.load() ^^^^^^^^^^^^^^^^^^^^^^ File "/Users/juliusbusecke/.cache/uv/environments-v2/mre-object-has-no-attr-value-cd1317b944d0d9b9/lib/python3.12/site-packages/xarray/backends/common.py", line 312, in load (_decode_variable_name(k), v) for k, v in self.get_variables().items() ^^^^^^^^^^^^^^^^^^^^ File "/Users/juliusbusecke/.cache/uv/environments-v2/mre-object-has-no-attr-value-cd1317b944d0d9b9/lib/python3.12/site-packages/xarray/backends/zarr.py", line 858, in get_variables return FrozenDict((k, self.open_store_variable(k)) for k in self.array_keys()) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/juliusbusecke/.cache/uv/environments-v2/mre-object-has-no-attr-value-cd1317b944d0d9b9/lib/python3.12/site-packages/xarray/core/utils.py", line 415, in FrozenDict return Frozen(dict(*args, **kwargs)) ^^^^^^^^^^^^^^^^^^^^^ File "/Users/juliusbusecke/.cache/uv/environments-v2/mre-object-has-no-attr-value-cd1317b944d0d9b9/lib/python3.12/site-packages/xarray/backends/zarr.py", line 858, in <genexpr> return FrozenDict((k, self.open_store_variable(k)) for k in self.array_keys()) ^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/juliusbusecke/.cache/uv/environments-v2/mre-object-has-no-attr-value-cd1317b944d0d9b9/lib/python3.12/site-packages/xarray/backends/zarr.py", line 852, in open_store_variable attributes["_FillValue"], original_zarr_dtype.value ^^^^^^^^^^^^^^^^^^^^^^^^^AttributeError: 'Float32' object has no attribute 'value'If I downgrade to v3.0.10 the read works fine, so I am wondering if this is a regression. I am a bit confused because Max showed me theregression tests which should cover exactly this case.
I uploaded the dataset to a public bucket, so the script below should be fully repoducible and the dataset inspectable. Thankfull for any pointers.
Steps to reproduce
# /// script# requires-python = ">=3.10"# dependencies = [# "fsspec==2024.12.0",# "s3fs==2024.12.0",# "xarray==2025.1.1",# "zarr @ git+https://github.com/zarr-developers/zarr-python@94983362f06f9bb4be3f04562b179549e36a87c4"# ]# ///# To reproduce failure use dependencies above. To fix, swap "zarr @ git+https://github.com/zarr-developers/zarr-python@94983362f06f9bb4be3f04562b179549e36a87c4" for "zarr==3.0.10"importxarrayasxrimportzarrzarr.print_debug_info()ds=xr.open_dataset("s3://s3://nasa-eodc-public/jbusecke/reproducers/nldas3_subsampled.zarr",engine='zarr',storage_options={"anon":True })print(ds)
Additional output
Required dependencies:
packaging: 25.0
numpy: 2.3.2
numcodecs: 0.16.2
typing_extensions: 4.14.1
donfig: 0.8.1.post1
Optional dependencies:
botocore: 1.39.11
fsspec: 2024.12.0
numcodecs: 0.16.2
s3fs: 2024.12.0