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Add read_shards option to xbeam.open_zarr() and Dataset.from_zarr(). - #207
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Sharded zarr v3 stores can pack many small inner chunks into each shard, so inferring Beam chunks from the inner chunks dispatches too many read operations and can cause race conditions on writing. Introduces `read_shards=True` so the unit of work is the shard size of the source dataset. `read_shards` defaults to `False`, so existing callers remain unchanged. PiperOrigin-RevId: 961070996
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Add read_shards option to xbeam.open_zarr() and Dataset.from_zarr().
Sharded zarr v3 stores can pack many small inner chunks into each shard, so
inferring Beam chunks from the inner chunks dispatches too many read operations
and can cause race conditions on writing.
Introduces
read_shards=Trueso the unit of work is the shard size of thesource dataset.
read_shardsdefaults toFalse, so existing callers remain unchanged.