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id node_id number title user state locked assignee milestone comments created_at updated_at ▲ closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
488243328 MDExOlB1bGxSZXF1ZXN0MzEzMzA4NzE4 3276 map_blocks dcherian 2448579 closed 0     19 2019-09-02T15:32:42Z 2019-10-17T01:30:30Z 2019-10-10T23:44:19Z MEMBER   0 pydata/xarray/pulls/3276
  • [x] xref #3147, closes #3323
  • [x] Tests added
  • [x] Passes black . && mypy . && flake8
  • [x] Fully documented, including whats-new.rst for all changes and api.rst for new API

This is a second attempt. It works with Datasets also in that it can pass Dataset chunks to the user's function. I haven't figured out how to reconstruct a Dataset from things returned from the user's function. For DataArrays, I currently assume that the user function returns chunks of the same shape as the provided chunk.

A few questions: 1. I wonder if we should introduce a meta xarray object that describes the final result that user expects back i.e. a template DataArray or Dataset with chunks, dtype etc. specified. We could have a utility function that makes it easy to create these templates from existing objects.

  1. If the user function doesn't return anything, (e.g. it writes to a file), how do I "compute" the graph? In this case, we could rename this function to apply_blocks and release that till we figure out point 1?

  2. Should we also add Dataset.to_delayed and DataArray.to_delayed? This would make use-cases like the one in point 2 easier.

ping @mrocklin 

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     xarray 13221727 pull

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