DOC: LRUStoreCache removed in Zarr 3.0, not documented

[ljwoods2]

Describe the issue linked to the documentation

I may be missing something, but noticed our CI was failing with Zarr v3 but can't find any deprecation warning or migration information for the zarr.storage.LRUStoreCache.

Is this no longer supported, or is there another way to do this?

Suggested fix for documentation

No response

[d-v-b]

sorry about that! looks like we forgot to add a deprecation to LRUStoreCache.

We have not implemented this for v3. In the longer term, I think we see caching as an important part of basic storage performance, and when we have have caching baked in to all stores, then a specialized LRUStoreCache store wouldn't make much sense.

But our future plans are not much use to you today. To get LRUStoreCache functionality going right now, I would look at the general purpose store wrapper class. If you subclassed WrapperStore and overrode __init__ to add cache setup logic, and overrode get(key) to add "check if key is in the cache, otherwise fetch it" logic then I think everything would work.

Let me know if that turns out to be bad advice, or you want more pointers.