feat: add lazy cache blob types (arrow, npy)#9035
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dmadisetti merged 8 commits intomainfrom Apr 15, 2026
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dmadisetti
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Pull request overview
This PR fixes lazy-cache restore behavior so missing blob references don’t stall execution, and extends lazy-cache blob serialization to support format-aware storage (NumPy and Arrow) in addition to pickle.
Changes:
- Update lazy loader restore path to parallelize blob reads with explicit “missing blob” signaling.
- Introduce format registries for blob serialization/deserialization (pickle / “npz” / Arrow) plus per-item
type_hintmetadata. - Add round-trip tests for NumPy, polars, and pandas cached values.
Reviewed changes
Copilot reviewed 5 out of 5 changed files in this pull request and generated 7 comments.
Show a summary per file
| File | Description |
|---|---|
marimo/_save/loaders/lazy.py |
Adds loader-strategy resolution, format-aware blob (de)serialization, and updated parallel restore behavior. |
marimo/_save/stubs/lazy_stub.py |
Defines loader-strategy registry and blob serializer/deserializer registries; adds type_hint to manifest schema. |
marimo/_save/stubs/stubs.py |
Extracts shared mro_lookup() helper for MRO-based registry lookups. |
marimo/_save/stubs/__init__.py |
Rewires stub registration to use mro_lookup() and re-exports relevant symbols. |
tests/_save/loaders/test_loader.py |
Adds format round-trip tests for numpy/polars/pandas lazy-cache storage. |
mscolnick
previously approved these changes
Apr 13, 2026
mscolnick
approved these changes
Apr 15, 2026
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📝 Summary
Fixes a bug where a lazy cache blob miss blocked execution. Additionally adds
arrowandnpzformats overpicklefor type relevant storage.