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  • Map_blocks should raise nice error if provided template has no dask arrays · 3 ✖

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id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
1180548098 https://github.com/pydata/xarray/issues/6763#issuecomment-1180548098 https://api.github.com/repos/pydata/xarray/issues/6763 IC_kwDOAMm_X85GXbwC dcherian 2448579 2022-07-11T15:23:03Z 2022-07-11T15:23:03Z MEMBER

It has to look exactly like the output dataset prior to computing (just constructed with dummy values)

 
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   Map_blocks should raise nice error if provided template has no dask arrays 1298145215
1180517639 https://github.com/pydata/xarray/issues/6763#issuecomment-1180517639 https://api.github.com/repos/pydata/xarray/issues/6763 IC_kwDOAMm_X85GXUUH TomNicholas 35968931 2022-07-11T14:57:23Z 2022-07-11T14:57:23Z MEMBER

Just tagging on here to say that I had a go at using map_blocks yesterday and found the requirements for the template argument a bit unclear. The documentation should say

a) what type of data is expected (in-memory vs lazy dask) b) what coordinates and indexes are required c) names d) chunking structure as above

I'm happy to contribute to this but probably only after SciPy :sweat_smile:

 
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   Map_blocks should raise nice error if provided template has no dask arrays 1298145215
1178269100 https://github.com/pydata/xarray/issues/6763#issuecomment-1178269100 https://api.github.com/repos/pydata/xarray/issues/6763 IC_kwDOAMm_X85GOvWs dcherian 2448579 2022-07-07T21:58:25Z 2022-07-07T21:58:25Z MEMBER

template.chunks is None. It needs to have the expected output chunking.

A PR raising a nice error message here when if not template.chunksizes: would be very welcome

We can also delete the if clause here:https://github.com/pydata/xarray/blob/ce40b9391a996b8218e1c7b1e83905b8dd4bc1fd/xarray/core/parallel.py#L383-L388

and use the new chunksizes property: output_chunks = template.chunksizes

 
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   Map_blocks should raise nice error if provided template has no dask arrays 1298145215

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