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  • joshmoore · 3 ✖

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  • Should the zarr backend support NCZarr conventions? · 3 ✖

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1076942019 https://github.com/pydata/xarray/issues/6374#issuecomment-1076942019 https://api.github.com/repos/pydata/xarray/issues/6374 IC_kwDOAMm_X85AMNTD joshmoore 88113 2022-03-24T00:18:14Z 2022-03-24T00:18:14Z NONE

rabernat commented 7 hours ago My opinion is that we should not try to support the nczarr conventions directly. Xarray already supports nczarr via netCDF4. If netCDF4 can open the Zarr store, then Xarray can read it. ... I would turn this question around and ask: if netCDF4 supports access to these datasets directly, what's the advantage of xarray bypassing netCDF4 and opening them directly?

@malmans2 can chime in with his experience, but it seems that from the user point-of-view, not needing to know if something is an xarray-zarr or a nczarr would be kinder of us. Plus as said below, I do think it puts us on the path to defining a common spec.

Supporting nczarr directly would require lots of custom logic within xarray.

Mea culpa. I wasn't clear enough about the intent from my side at least, namely to support loading ARRAY_DIMENSIONS (or some other necessary subset) from nczarr rather than its entirety.

DennisHeimbigner commented 4 hours ago this is because xarray cannot handle subgroups.

I'll add as a side that work on the subgroups (i.e. datatree) is progressing in case any consideration needs to be included now rather than later.

 
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   Should the zarr backend support NCZarr conventions? 1172229856
1076601482 https://github.com/pydata/xarray/issues/6374#issuecomment-1076601482 https://api.github.com/repos/pydata/xarray/issues/6374 IC_kwDOAMm_X85AK6KK joshmoore 88113 2022-03-23T17:22:23Z 2022-03-23T17:22:23Z NONE

Thanks, @max-sixty! Guess it just doesn't complete for those outside the org.

 
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   Should the zarr backend support NCZarr conventions? 1172229856
1076544302 https://github.com/pydata/xarray/issues/6374#issuecomment-1076544302 https://api.github.com/repos/pydata/xarray/issues/6374 IC_kwDOAMm_X85AKsMu joshmoore 88113 2022-03-23T16:31:53Z 2022-03-23T16:31:53Z NONE

Thanks for the details, @DennisHeimbigner. But my reading of what you outline is that for some nczarr datasets, xarray will be able to open them. Correct? If so, there were always likely to be follow-on's to this issue when/if we identify critical edge cases. Perhaps for the moment, though, we can focus here on what we want to enable and what can be done straight-forwardly.

That likely makes this more a question for @shoyer, @jhamman, @rabernat et al. (sorry, no way to @-mention all the current devs) @malmans2 is probably in a good place to start updating the existing Zarr backend to also check for the nczarr files, but if there are strong opinions against or alternatives that would be preferred, it would be good to hear about them.

 
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   Should the zarr backend support NCZarr conventions? 1172229856

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