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Support zarr v3 #4260

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@alejoe91 alejoe91 commented Dec 11, 2025 •
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Fixes #4014

Implement bulk changes from zarr v2 to zarr v3

  • create_dataset -> create_array
  • Serialization of non JSON serializable objects (recording/sorting/extensions) not supported anymore
  • Compressors use zarr.codecs, which wrap numcodecs compressor (e.g., Blosc -> BloscCodec)
  • Clean up of tests

TODO:

  • Add sharding parameter to save function
  • Stor spikes as structured dtype
  • Backcompatibility
  • Test v2 reading in v3: make an action that generates v2 zarr for Recording/Sorting/Template/SortingAnalyzer using an old SI version and reads it in the new version

Depends on SpikeInterface/probeinterface#387

@alejoe91 alejoe91 added dependencies Issue/PR that is related to dependencies core Changes to core module labels Dec 11, 2025
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Migrating to zarr v3

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