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Optimize writes to existing Zarr stores. #8875

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Merged
merged 4 commits into from
Mar 29, 2024
Merged

Optimize writes to existing Zarr stores. #8875

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eb37aed
Optimize writes to existing Zarr stores.
dcherian Mar 22, 2024
e0a3e10
Add test
dcherian Mar 28, 2024
0dc71d4
Merge branch 'main' into optimize-zarr-appends
dcherian Mar 28, 2024
6d89099
fix test
dcherian Mar 28, 2024
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7 changes: 6 additions & 1 deletion xarray/backends/zarr.py
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Original file line number Diff line number Diff line change
Expand Up @@ -623,7 +623,12 @@ def store(
# avoid needing to load index variables into memory.
# TODO: consider making loading indexes lazy again?
existing_vars, _, _ = conventions.decode_cf_variables(
self.get_variables(), self.get_attrs()
{
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feels like we should also be skipping this for mode="w" to allow overwriting the existing encoding?

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Can you expand on what you mean? Is that because we would have just written these vars so already know their values/schema?

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mode="w" means overwrite so we shoudn't care about encoding on disk, no?

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I added a test, the encoding does get update as expected with mode="w", so presumably zarr is nuking the store with mode="w".

k: v
for k, v in self.get_variables().items()
if k in existing_variable_names
},
self.get_attrs(),
)
# Modified variables must use the same encoding as the store.
vars_with_encoding = {}
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