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Better chunk manager error #7962

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dcherian opened this issue Jul 5, 2023 · 4 comments
Closed

Better chunk manager error #7962

dcherian opened this issue Jul 5, 2023 · 4 comments
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topic-chunked-arrays Managing different chunked backends, e.g. dask topic-error reporting

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@dcherian
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dcherian commented Jul 5, 2023 •
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What happened?

I just ran in to this error in an environment without dask.

TypeError: Could not find a Chunk Manager which recognises type <class 'dask.array.core.Array'>

I think we could easily recommend the user to install a package that provides dask by looking at type(array).__name__. This would make the message a lot friendlier
@TomNicholas TomNicholas mentioned this issue Jul 5, 2023
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@TomNicholas TomNicholas added the topic-chunked-arrays Managing different chunked backends, e.g. dask label Jul 5, 2023
@TomNicholas
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How was an instance of dask.array.core.Array even created if you were in an environment without dask?

I agree that message could be clearer though - opened #7963.

@dcherian
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dcherian commented Jul 5, 2023

How was an instance of dask.array.core.Array even created if you were in an environment without dask?

Yeah i realized that out 2 minutes later. Not sure what happened, may be bad editable install.

@TomNicholas
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Actually wait it's possible this might be a real bug - if xarray.core.pycompat.is_duck_dask_array returns False for an instance of dask.array.core.Array. We shouldn't see that type though, so if you can't reproduce it easily it's probably a bad install instead though.

@dcherian
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Closing as probable bad install

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Suggest installing dask when not discovered by ChunkManager TomNicholas/xarray
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@dcherian @TomNicholas