issue_comments: 1098574761

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https://github.com/pydata/xarray/issues/6456#issuecomment-1098574761 https://api.github.com/repos/pydata/xarray/issues/6456 1098574761 IC_kwDOAMm_X85Beuup 3698640 2022-04-13T23:34:16Z 2022-04-13T23:34:48Z CONTRIBUTOR

In the example it's saving every iteration, but in my actual code it's much less frequent

when I said "you're overwriting the file every iteration" I meant to put the emphasis on overwiting. by using mode='w' instead of mode='a' you're telling zarr to delete the file if it exists and the re-create it every time to_zarr is executed.

See the docs on xr.Dataset.to_zarr:

mode ({"w", "w-", "a", "r+", None}, optional) – Persistence mode: “w” means create (overwrite if exists); “w-” means create (fail if exists); “a” means override existing variables (create if does not exist); “r+” means modify existing array values only (raise an error if any metadata or shapes would change). The default mode is “a” if append_dim is set. Otherwise, it is “r+” if region is set and w- otherwise.

This interpretation of mode is consistent across all of python - see the docs for python builtins: open

So I think changing your writes to ds3.to_zarr('zarr_bug.zarr', mode='a') as Max suggested will get you a good part of the way there :)

 
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