Rename chunk_dim to stream_dim, following ezmsg core - #16
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Tracks the upstream rename of `AxisArray.chunk_dim`. `chunk` collided three ways: xarray's `DataArray.chunk`, dask, zarr and HDF5 all use it for memory/IO layout, and ezmsg's own `array_chunker` / `chunk_len` mean "how much data per message". `stream_dim` names the role instead -- the dimension the stream extends along. `util/chunkdim.py` becomes `util/streamdim.py`, `resolve_chunk_dim` and `resolve_configured_chunk_dim` become `resolve_stream_dim` and `resolve_configured_stream_dim`. `STREAMING_DIMS`, `resolve_feature_dim` and `resolve_transform_dim` keep their names. Prose describing "chunk size" -- how much data a message carries, in clockdriven and counter -- is left alone; that is the other meaning of the word and it is the correct one there. Pure rename. 239 passed, 1 skipped.
This was referenced Sep 9, 2026
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Tracks the rename of
AxisArray.chunk_dimtostream_dimin ezmsg core (ezmsg-org/ezmsg#265).Why the name changed
chunkwas already spoken for in three directions:chunkfor multi-dimensional memory/IO layout. SinceAxisArraydeliberately echoesxarray.DataArray— which has a.chunk()method — borrowing the word invites exactly the wrong reading.array_chunker/chunk_lenmean "how much data per message".stream_dimnames that role directly and reuses ezmsg's own vocabulary (InputStream/OutputStream).append_dim(zarr) andconcat_dim(xarray) were the closest semantic matches but were rejected: in ezmsg-sigproc those words already name the target argument of an append or concat operation. netCDF'sunlimited_dimsdescribes a static property of the dimension rather than what is happening to it.What's in here
Pure rename — no behaviour change.
util/chunkdim.pybecomesutil/streamdim.py, and the two exported helpers are renamed with it:resolve_chunk_dimresolve_stream_dimresolve_configured_chunk_dimresolve_configured_stream_dimSTREAMING_DIMS,resolve_feature_dimandresolve_transform_dimkeep their names. Neither renamed helper has ever been published — the latest tag is v1.12.0, which predates the module — so no released API breaks.Uses of
chunkthat mean how much data a message carries are deliberately left alone; only the dimension sense is renamed, including the prose that describes it.The
ezmsgfloor moves>=3.10.0b2→>=3.10.0b3. 3.10.0b1 and b2 are on PyPI carryingchunk_dim, so the floor has to move for the rename to be meaningful; 3.10.0b3 is the first release withstream_dim.Testing
239 passed, 1 skipped, run against the renamed ezmsg core and ezmsg-baseproc installed editable.
Merge order: ezmsg 3.10.0b3 must be on PyPI before this merges, or CI here resolves an
ezmsgthat has nostream_dim.