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fix(chunk-grids): read mixed regular/rectilinear chunk grids written by zarr 3.2.x - #4375

Merged

d-v-b merged 111 commits into

zarr-developers:mainfrom

d-v-b:fix/mixed-regular-chunk-grid-4374

Oct 2, 2026

Merged

fix(chunk-grids): read mixed regular/rectilinear chunk grids written by zarr 3.2.x#4375
d-v-b merged 111 commits into
zarr-developers:mainfrom
d-v-b:fix/mixed-regular-chunk-grid-4374

Commits on Sep 9, 2026
Commits on Sep 12, 2026
- Merge branch 'main' into fix/zero-length-single-invariant
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Commits on Sep 13, 2026
- docs: qualify zero-chunk compatibility history
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Commits on Sep 16, 2026
- Merge branch 'main' into fix/zero-length-single-invariant
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- Merge branch 'main' into fix/zero-length-single-invariant
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Commits on Sep 18, 2026
Commits on Sep 19, 2026
Commits on Sep 25, 2026
- Merge branch 'fix/zero-length-single-invariant' (#4334) into fix/mixed-regular-chunk-grid-4374
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- refactor(metadata): read both legacy regular chunk grid forms in one place
  
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- Merge branch 'main' into fix/zero-length-single-invariant
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- fix(metadata): read a stored zero chunk size on a grown axis as one spanning chunk
  
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- test: a stateful test of one array's create/append/resize/write life
  
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- Merge branch 'fix/zero-length-single-invariant' (#4334) into fix/mixed-regular-chunk-grid-4374
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- fix(metadata): stop the zero chunk size warning from naming writers
  
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- Merge branch 'fix/zero-length-single-invariant' (#4334) into fix/mixed-regular-chunk-grid-4374
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- fix(metadata): stop the mixed chunk grid messages from naming releases
  
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- chore(metadata): drop an orphaned comment in ArrayV2Metadata.__init__
  
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- fix(chunk-grids): size a full-span shard as a multiple of the inner chunk
  
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- refactor(metadata): read invalid stored chunk sizes in one module of document upgrades
  
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- docs: rewrite the 4334 changelog fragment and trim restating docstrings
  
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- test: model exactly what the store holds in the array lifecycle state machine
  
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- Merge branch 'loop/4334' (#4334) into loop/4375
  
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- refactor(metadata): warn about an upgraded document only once it validates
  
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- fix(metadata): read a regular grid listing chunk edges as a document upgrade
  
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- refactor(metadata): drop numpy and tuple widening from chunk grid metadata
  
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- docs: describe reading mixed regular grids without the rectilinear flag
  
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- refactor(metadata): warn about an upgraded document only once it validates
  
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- Merge loop/4334 into w4375
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Commits on Sep 26, 2026
- refactor(metadata): one per-axis rule for stored chunk sizes, one rule for edges
  
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- refactor(chunk-grids): start chunk guessing from the one full-span rule
  
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- test: run the array lifecycle state machine in the slow Hypothesis job
  
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- Merge loop/4334 into loop/4375
  
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- fix(metadata): read a regular grid mixing sizes and edge lists per axis
  
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- fix(array): check that metadata can be stored before touching the store
  
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- fix(array): store upgraded metadata before writing the first chunk
  
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- refactor(metadata): name an array one way in upgrade warnings
  
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- refactor(metadata): one rule for bare sizes and edge lists; one noun in messages
  
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- Merge loop/4334 into loop/4375
  
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- fix: encode metadata before deleting store content
  
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- test: reject a run-length entry that is not a pair
  
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- fix(array): store the upgrade of the current stored document before writing
  
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- test: prefer zero-length axes for stored chunk size 0 in the lifecycle machine
  
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- Merge loop/4334 into loop/4375
  
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- refactor: the caller that knows the node names it in gate errors
  
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- fix(group): delete a consolidated member in place, after encoding without it
  
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- fix(metadata): keep accepting the chunk sizes zarr 3.4.0 accepted in metadata constructors (patch release)
  
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- fix(array): leave a valid stored document as written on a stale handle's first write
  
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- docs: describe the 4334 changes to metadata constructors for a patch release
  
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- Merge loop/4334 into loop/4375
  
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- test: expect the patch release's wording for non-integral chunk edges (patch release)
  
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- fix(metadata): read float edges only in stored rectilinear documents
  
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- Merge loop/4334 into loop/4375
  
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- test: read float edges in a regular grid that lists chunk edge lengths
  
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- test(codecs): pickle a ShardingCodec with an inner chunk size of 0
  
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- fix(group): build every node before create_hierarchy deletes or stores anything
  
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- fix(metadata): warn only where the user must act; guard and refresh upgraded copies
  
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- test: expect the lifecycle machine's upgrade warning only on non-empty axes
  
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- Merge loop/4334 into loop/4375
  
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- fix(group): encode a group's consolidated metadata before storing member upgrades
  
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- fix(metadata): leave a sharded chunk size of 0 unread when the inner shape is invalid
  
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- perf(metadata): read each upgraded member once, concurrently, and adopt it
  
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- Merge loop/4334 into loop/4375
  
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- fix(group): store the consolidated metadata as it is after a deletion
  
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- refactor: name a node in errors as "Array 'path': what happened"
  
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- fix(group): adopt refreshed consolidated members in place
  
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- fix(metadata): raise the rectilinear flag error when refreshing a consolidated member
  
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- Merge loop/4334 into loop/4375
  
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- fix(group): say nothing was stored when a consolidated member needs the flag
  
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- perf(group): read each upgraded member once when deleting a member
  
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- fix(group): store a group's documents only; keep upgraded members as stored
  
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- Merge loop/4334 into loop/4375
  
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- docs(group): say what consolidated metadata stores for an upgraded array
  
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- Merge loop/4334 into loop/4375
  
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- fix(array): clear the stored document whenever an array stores its metadata
  
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- Merge loop/4334 into loop/4375
  
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- test(metadata): pin that a failed metadata save keeps the stored document mark
  
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- Merge loop/4334 into loop/4375
  
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Commits on Sep 29, 2026
- Merge remote-tracking branch 'up/main' into up/4334
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- Merge branch 'up/4334' into up/4375
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- fix(metadata): read a stored chunk size of 0 as 1, however long the axis
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- Merge branch 'up/4334' into up/4375
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- fix(metadata): re-save only upgrades that move chunks, and read non-JSON input as is
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- Merge branch 'up/4334' into up/4375
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- fix(array): encode new array metadata before deleting an existing node
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- test(metadata): type the rectilinear chunks passed to zarr.create in an overwrite test
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Commits on Sep 30, 2026
- Merge branch 'main' into fix/mixed-regular-chunk-grid-4374
  
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- fix(metadata): recommend recreating an array whose stored chunk size was 0
  
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- Merge branch 'work/4334' (recreate hint for stored chunk size 0)
  
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- test(metadata): widen the abbreviated-message bound for the two hints
  
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- fix(metadata): give the recipe for recreating an array read from a stored chunk size of 0
  
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- Merge branch 'work/4334' into work/4375
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- test(metadata): widen the abbreviated-message bound for the recipe
  
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- Merge branch 'main' into fix/mixed-regular-chunk-grid-4374
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Commits on Oct 1, 2026
- Merge branch 'main' into fix/zero-length-single-invariant
  
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- Merge the updated #4334 (main merged) into fix/mixed-regular-chunk-grid-4374
  
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- refactor(metadata): call the lenient readings of stored documents repairs, not upgrades
  
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- Merge the upgrade-to-repair rename from #4334
  
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- Merge branch 'main' into fix/mixed-regular-chunk-grid-4374
  
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- docs(changes): trim the #4375 fragment to what the PR adds over main
  
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Commits on Oct 2, 2026
- Merge branch 'main' into fix/mixed-regular-chunk-grid-4374
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Commits

Commits on Sep 9, 2026

Commits on Sep 12, 2026

Commits on Sep 13, 2026

Commits on Sep 16, 2026

Commits on Sep 18, 2026

Commits on Sep 19, 2026

Commits on Sep 25, 2026

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Commits on Sep 29, 2026

Commits on Sep 30, 2026

Commits on Oct 1, 2026

Commits on Oct 2, 2026