ValueError: codec not available: 'blosc2'

[bakamotokatas]

Zarr version

v2.16.1

Numcodecs version

v0.12.1

Python Version

3.11.6

Operating System

Manjaro Linux

Installation

using system package manager aur

Description

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3.11/site-packages/xarray/backends/zarr.py", line 824, in open_zarr
    ds = open_dataset(
         ^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/xarray/backends/api.py", line 541, in open_dataset
    backend_ds = backend.open_dataset(
                 ^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/xarray/backends/zarr.py", line 902, in open_dataset
    ds = store_entrypoint.open_dataset(
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/xarray/backends/store.py", line 32, in open_dataset
    vars, attrs = store.load()
                  ^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/xarray/backends/common.py", line 128, in load
    (_decode_variable_name(k), v) for k, v in self.get_variables().items()
                                              ^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/xarray/backends/zarr.py", line 485, in get_variables
    return FrozenDict(
           ^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/xarray/core/utils.py", line 469, in FrozenDict
    return Frozen(dict(*args, **kwargs))
                  ^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/xarray/backends/zarr.py", line 485, in <genexpr>
    return FrozenDict(
                     ^
  File "/usr/lib/python3.11/site-packages/zarr/hierarchy.py", line 673, in _array_iter
    yield _key if keys_only else (_key, self[key])
                                        ~~~~^^^^^
  File "/usr/lib/python3.11/site-packages/zarr/hierarchy.py", line 462, in __getitem__
    return Array(
           ^^^^^^
  File "/usr/lib/python3.11/site-packages/zarr/core.py", line 224, in __init__
    self._load_metadata()
  File "/usr/lib/python3.11/site-packages/zarr/core.py", line 243, in _load_metadata
    self._load_metadata_nosync()
  File "/usr/lib/python3.11/site-packages/zarr/core.py", line 291, in _load_metadata_nosync
    self._compressor = get_codec(compressor)
                       ^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/numcodecs/registry.py", line 56, in get_codec
    raise ValueError('codec not available: %r' % codec_id)
ValueError: codec not available: 'blosc2'

it gives blosc2 error

Steps to reproduce

import xarray as xr
xr.open_zarr("/home/bakamotokatas/Downloads/icon-eu/20200101_00.zarr.zip")

Additional output

No response

[jhamman]

@bakamotokatas - the blosc codec in numcodecs has an id of blosc, not blosc2. Can you share your array metadata (.zarray)? Do you know how this dataset was created? Is it possible someone used a custom codec to create this dataset?

[jhamman]

closing as stale, feel free to reopen if you are still running into this issue.