zarrita 0.1.0a4

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Zarrita

Zarrita is an experimental implementation of Zarr v3 including sharding. This is only a technical proof of concept meant for generating sample datasets. Not recommended for production use.

Setup

import zarrita
import numpy as np

store = zarrita.LocalStore('testdata') # or zarrita.RemoteStore('s3://bucket/test')

Create an array

a = await zarrita.Array.create_async(
    store,
    'array',
    shape=(6, 10),
    dtype='int32',
    chunk_shape=(2, 5),
    codecs=[zarrita.codecs.blosc_codec()],
    attributes={'question': 'life', 'answer': 42}
)
await a.async_[:, :].set(np.ones((6, 10), dtype='int32'))

Open an array

a = await zarrita.Array.open_async(store, 'array')
assert np.array_equal(await a.async_[:, :].get(), np.ones((6, 10), dtype='int32'))

Create an array with sharding

a = await zarrita.Array.create_async(
    store,
    'sharding',
    shape=(16, 16),
    dtype='int32',
    chunk_shape=(16, 16),
    chunk_key_encoding=('v2', '.'),
    codecs=[
        zarrita.codecs.sharding_codec(
            chunk_shape=(8, 8),
            codecs=[zarrita.codecs.blosc_codec()]
        ),
    ],
)
data = np.arange(0, 16 * 16, dtype='int32').reshape((16, 16))
await a.async_[:, :].set(data)
assert np.array_equal(await a.async_[:, :].get(), data)

Create a group

g = await zarrita.Group.create_async(store, 'group')
g2 = await g.create_group_async('group2')
a = await g2.create_array_async(
    'array',
    shape=(16, 16),
    dtype='int32',
    chunk_shape=(16, 16),
)
await a.async_[:, :].set(np.arange(0, 16 * 16, dtype='int32').reshape((16, 16)))

Open a group

g = await zarrita.Group.open_async(store, 'group')
g2 = g['group2']
a = g['group2/array']
assert np.array_equal(await a.asnyc_[:, :].get(), np.arange(0, 16 * 16, dtype='int32').reshape((16, 16)))

Credits

This is a largely-rewritten fork of zarrita by @alimanfoo. It implements the Zarr v3 draft specification created by @alimanfoo, @jstriebel, @jbms et al.

Licensed under MIT