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  • shoyer · 5 ✖
id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
696518519 https://github.com/pydata/xarray/pull/4187#issuecomment-696518519 https://api.github.com/repos/pydata/xarray/issues/4187 MDEyOklzc3VlQ29tbWVudDY5NjUxODUxOQ== shoyer 1217238 2020-09-22T05:40:57Z 2020-09-22T05:40:57Z MEMBER

Thanks @weiji14 and @Mikejmnez for your contribution!

 
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   Xarray open_mfdataset with engine Zarr 647804004
690885702 https://github.com/pydata/xarray/pull/4187#issuecomment-690885702 https://api.github.com/repos/pydata/xarray/issues/4187 MDEyOklzc3VlQ29tbWVudDY5MDg4NTcwMg== shoyer 1217238 2020-09-11T05:35:29Z 2020-09-11T05:35:29Z MEMBER

Just to note down a few things:

  1. The deprecated "auto_chunk" kwarg was removed
  2. open_zarr uses chunks="auto" by default, whereas open_dataset uses chunks=None (see my comment inline)

The different default chunk behaviour (point 2) is worth raising, and it might be best to postpone the deprecation of open_zarr until the next release, so that there's time to discuss what we want the default setting to be (None or auto).

These all sound good to me!

I agree that we shouldn't change the default behavior for open_dataset, and should keep open_zarr around for now -- there is no urgent need to deprecate it.

 
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   Xarray open_mfdataset with engine Zarr 647804004
652206442 https://github.com/pydata/xarray/pull/4187#issuecomment-652206442 https://api.github.com/repos/pydata/xarray/issues/4187 MDEyOklzc3VlQ29tbWVudDY1MjIwNjQ0Mg== shoyer 1217238 2020-07-01T05:49:51Z 2020-07-01T05:50:31Z MEMBER

As for the annoyance of needing to write backend_kwargs={"consolidated": True}, I wonder if we could detect this automatically by checking for the existence of a .zmetadata key? This would add a small amount of overhead (one file access) but this probably would not be prohibitively expensive.

 
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   Xarray open_mfdataset with engine Zarr 647804004
652204634 https://github.com/pydata/xarray/pull/4187#issuecomment-652204634 https://api.github.com/repos/pydata/xarray/issues/4187 MDEyOklzc3VlQ29tbWVudDY1MjIwNDYzNA== shoyer 1217238 2020-07-01T05:44:20Z 2020-07-01T05:44:32Z MEMBER

We could also automatically detect zarr stores in open_dataset without requiring engine='zarr' if:

  1. the argument inherits from collections.abc.Mapping, and
  2. it contains a key '.zgroup', corresponding to zarr metadata.
 
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   Xarray open_mfdataset with engine Zarr 647804004
652202093 https://github.com/pydata/xarray/pull/4187#issuecomment-652202093 https://api.github.com/repos/pydata/xarray/issues/4187 MDEyOklzc3VlQ29tbWVudDY1MjIwMjA5Mw== shoyer 1217238 2020-07-01T05:36:00Z 2020-07-01T05:36:00Z MEMBER

I wonder if it's really worth deprecating open_zarr(). open_dataset(..., engine='zarr') is a bit more verbose, especially with backend_kwargs to pass optional arguments. It seems pretty harmless to keep open_zarr() around, especially if it's just an alias for open_datraset(engine='zarr').

 
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   Xarray open_mfdataset with engine Zarr 647804004

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