issues: 756325149

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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
756325149 MDExOlB1bGxSZXF1ZXN0NTMxODg3OTk5 4646 Modify zarr chunking as suggested in #4496 35919497 closed 0     0 2020-12-03T15:56:28Z 2021-02-11T01:51:55Z 2020-12-09T12:26:45Z COLLABORATOR   0 pydata/xarray/pulls/4646

Part of https://github.com/pydata/xarray/pull/4595 The changes involve only open_dataset(..., engine=zarr) (and marginally open_zarr), in particular, _get_chunks has been modified to fit #4496 (comment) option 1 chunking behaviour and align open_dataset chunking with dataset.chunk:

  • with auto it uses dask auto-chunking (if a preferred_chunking is defined, dask will take it into account as done in dataset.chunk)
  • with -1 it uses dask but no chunking.
  • with {} it uses the backend encoded chunks (when available) for on-disk data (xr.open_dataset) and the current chunking for already opened datasets (ds.chunk)

Add some test - [x] Releted to pydata#4496 - [x] Tests added - [x] Passes isort . && black . && mypy . && flake8 - [ ] User visible changes (including notable bug fixes) are documented in whats-new.rst

 
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