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perf: full shard write fast path#3793

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slevang wants to merge 3 commits intozarr-developers:mainfrom
slevang:full-shard-writes
Open

perf: full shard write fast path#3793
slevang wants to merge 3 commits intozarr-developers:mainfrom
slevang:full-shard-writes

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@slevang slevang commented Mar 19, 2026

Closes #3421. I got confused why there was so much download traffic when writing to a sharded dataset. This adds a fast path in the case we're writing a full shard.

TODO:

  • Add unit tests and/or doctests in docstrings
  • Add docstrings and API docs for any new/modified user-facing classes and functions
  • New/modified features documented in docs/user-guide/*.md
  • Changes documented as a new file in changes/
  • GitHub Actions have all passed
  • Test coverage is 100% (Codecov passes)

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example that reveals inefficient sharded writes

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