zarr-python

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[Description of PR] TODO: * [ ] Add unit tests and/or doctests in docstrings * [ ] Add docstrings and API docs for any new/modified user-facing classes and functions *...

dcherian

Modifying an array in a `MemoryStore` with multiprocessing does not work

9

### Zarr version 3.0.8 ### Numcodecs version 0.16.1 ### Python Version 3.13.0 ### Operating System macOS ### Installation uv ### Description I'm trying to modify data concurrently, making sure I'm...

dstansby

Chunked compression indices

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I'm working on a compressor where chunked encoding / decoding is possible, but during encoding we need to 1. know the data indices as part of the entire dataset (essentially...

juntyr

Make zarr.core private

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We seem to be converging on using a leading underscore to indicate private modules. Should we do this for `zarr.core` or can we simply document the intent of the module?

jhamman

consider removing default compressor / filters / serializer from config

1

Our config right now contains this logic for defining a default encoding scheme for a given data type: https://github.com/zarr-developers/zarr-python/blob/af55fcfaefa42b5ef556b1b5be33dcdd06a7fd0b/src/zarr/core/config.py#L85-L107 This approach is problematic because it requires dividing our data types...

d-v-b

Performance regression in V3

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### Zarr version 3.0.0 ### Numcodecs version 0.14.1 ### Python Version 3.13 ### Operating System Linux ### Installation Using uv ### Description This simple workload, which writes out the numbers...

y4n9squared

Coalesce and parallelize partial shard reads

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This PR optimizes reading more than one, but not all, chunks from a shard. Towards #1758. - Combines requests for chunks which are nearby within a shard into a single...

aldenks

there are some exceptions raised in #2874 that should direct people to specific sections of our docs. this issue tracks the creation of those documentation pages.

d-v-b

use our fork of s3fs for upstream testing

4

`s3fs` depends on an exact version of [`fsspec` (`2025.5.1`)](https://github.com/fsspec/s3fs/blob/2f3c76d9c36025c7daefa766a8f81c79fc4010e7/requirements.txt#L2). The unreleased version of `fsspec`, i.e. what you get when you install fsspec from a git dependency declaration like `fsspec @...

d-v-b

[Unexpected Behaviour] `open_group` raises `AssertionError` if array w/o group exists

1

### Zarr version 3.0.8 ### Numcodecs version 0.15.1 ### Python Version 3.11.11 ### Operating System Linux, Dockerfile based on python:3.11-slim ### Installation poetry ### Description I think there is some...

FabricioArendTorres