issue_comments: 721590240

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https://github.com/pydata/xarray/issues/4496#issuecomment-721590240 https://api.github.com/repos/pydata/xarray/issues/4496 721590240 MDEyOklzc3VlQ29tbWVudDcyMTU5MDI0MA== 35919497 2020-11-04T08:35:08Z 2020-11-04T09:22:01Z COLLABORATOR

@weiji14 Thank you very much for your feedback. I think we should align also xr.open_mfdataset. In the case of engine == zarr and chunk == -1 there is a UserWarning also in xr.open_dataset, but I think it should be removed.

Maybe we should evaluate for the future to integrate/use dask function dask.array.core.normalize_chunks (https://docs.dask.org/en/latest/array-api.html#dask.array.core.normalize_chunks) with the key previous_chunks (see comment https://github.com/pydata/xarray/pull/2530#discussion_r247352940) It could be particularly useful for (re-)chunking taking into account the previous chunks or the on-disk chunks, especially if the on-disk chunks are small.

 
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