"TypeError: Unsupported type for store_like: 'FSMap'" with new version libraries

[fralc]

I'm getting "TypeError: Unsupported type for store_like: 'FSMap'" when opening a zarr archive with the following new package versions:

s3fs = "2024.12.0"
zarr = "3.0.0"
dask = "2024.12.1"
xarray = "2025.1.1"

A sample of the code I am using is this:

import s3fs
import xarray

s3 = s3fs.S3FileSystem(anon=True, client_kwargs=dict(region_name='us-east-1'))
store = s3fs.S3Map(root='s3://noaa-nwm-retro-v2-zarr-pds', s3=s3, check=False)

nwm_ds = xarray.open_zarr(store)

Where I am wrong?
Thank you

[TomNicholas]

This seems like a bug with one of the new package versions following the zarr v3 release, so I've created an issue to track it (see #9957).

[negin513]

I see a similar error with the following:

era5_path = 'gs://gcp-public-data-arco-era5/ar/full_37-1h-0p25deg-chunk-1.zarr-v3'
era5_data = xarray.open_zarr(gcs.get_mapper(era5_path), chunks=None)

Following versions:

xarray 2025.1.2
zarr 3.0.2

Installing zarr<3.0.0 resolves the issue, but potentially a bug to be explored with zarr >3.0.0 ( #9957 ).

[jhamman]

In most cases, you don't need a mapper at all:

era5_path = 'gs://gcp-public-data-arco-era5/ar/full_37-1h-0p25deg-chunk-1.zarr-v3'
era5_data = xarray.open_zarr(era5_path, chunks=None)

[negin513]

Thanks Joe! Just tested this and removing gcs.get_mapper() worked with zarr 3>0.