Temporarily import loop_in_thread fixture from distributed

[jrbourbeau]

• Closes distributed 2022.8.0 is breaking xarray tests dask/distributed#6842
• Tests added
• User visible changes (including notable bug fixes) are documented in whats-new.rst
• New functions/methods are listed in api.rst

This is a quickfix similar to dask/dask#9337. Note there's a conversation happening over in dask/distributed#6806 around what testing utilities in distributed should be considered public.

[jrbourbeau]

This is only available in newer versions of distributed -- what's the minimum version of distributed xarray supports?

[andersy005]

i think we are now supporting distributed >= v2021.4: https://github.com/pydata/xarray/blob/main/ci/requirements/min-all-deps.yml

[jrbourbeau]

Thanks @andersy005! Actually looking at it more closely, it looks like loop_in_thread has been around for a long time but the need to actually import it is new. So the changes here should both fix the failures we're seeing and also be backwards compatible. It also looks like there's a CI build which tests against the minimum supported version of packages (including distributed)

xarray/.github/workflows/ci.yaml

Lines 52 to 54 in 787a96c

	- env: "min-all-deps"
	python-version: "3.8"
	os: ubuntu-latest

which is also passing

[jrbourbeau]

It's not immediately clear to me why the docs build is failing. Has that been happening elsewhere?

[andersy005]

It's not immediately clear to me why the docs build is failing. Has that been happening elsewhere?

When building docs on RTD, we turn Sphinx warnings into errors. Sphinx is throwing a warning that is then turned into an error after docs are built, as it appears that the SSL certificate for numba.pydata.org has expired or is misconfigured.

loading intersphinx inventory from https://rasterio.readthedocs.io/en/latest/objects.inv...
loading intersphinx inventory from https://sparse.pydata.org/en/latest/objects.inv...
WARNING: failed to reach any of the inventories with the following issues:
intersphinx inventory 'https://numba.pydata.org/numba-doc/latest/objects.inv' not fetchable due to <class 'requests.exceptions.SSLError'>: HTTPSConnectionPool(host='numba.pydata.org', port=443): Max retries exceeded with url: /numba-doc/latest/objects.inv (Caused by SSLError(CertificateError("hostname 'numba.pydata.org' doesn't match either of '*.github.com', 'www.github.com', 'github.io', 'github.com', '*.github.io', 'githubusercontent.com', '*.githubusercontent.com'")))

[andersy005]

I opened an issue just in case this is something that can be fixed upstream.

• SSL Certificate appears be to misconfigured numba/numba.github.com#10

[andersy005]

Thank you for this fix, @jrbourbeau!

[dcherian]

Thanks @jrbourbeau!