chunks=False --> ZeroDivisionError

[MattKleinsmith]

Minimal, reproducible code sample, a copy-pastable example if possible

z = zarr.open_array('example.zarr', mode='w', shape=100, chunks=False, dtype='i8', fill_value=0)
z

Problem description

Result:

ZeroDivisionError

Expected:

Array((100,), int64, chunks=(100,), order=C)
  nbytes: 800; nbytes_stored: 291; ratio: 2.7; initialized: 0/1
  compressor: Blosc(cname='lz4', clevel=5, shuffle=1)
  store: DirectoryStore

Reason for expectation:

chunks : int or tuple of ints, optional
    Chunk shape. If True, will be guessed from `shape` and `dtype`. If
    False, will be set to `shape`, i.e., single chunk for the whole array.

https://github.com/zarr-developers/zarr/blob/master/zarr/creation.py#L27-L29

Version and installation information

zarr=2.1.4
numcodecs=0.5.3
python=3.6.3
Ubuntu 16.04 on Docker
Pip installation

[MattKleinsmith]

It occurs with 2D arrays, too:

z = zarr.open_array('example.zarr', mode='w', shape=(100, 100), chunks=False, dtype='i8', fill_value=0)
z

[alimanfoo]

Thanks for reporting, will take a look asap.

…

On Thursday, February 8, 2018, Matt Kleinsmith ***@***.***> wrote: It occurs with 2D arrays, too: z = zarr.open_array('example.zarr', mode='w', shape=(100, 100), chunks=False, dtype='i8', fill_value=0) z — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#241 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAq8QlICSwNJOUjTK9ryNdEN_EICJE-Bks5tS2G3gaJpZM4R_BeY> .

-- Alistair Miles Head of Epidemiological Informatics Centre for Genomics and Global Health <http://cggh.org> Big Data Institute Building Old Road Campus Roosevelt Drive Oxford OX3 7LF United Kingdom Phone: +44 (0)1865 743596 Email: alimanfoo@googlemail.com Web: http://a <http://purl.org/net/aliman>limanfoo.github.io/ Twitter: https://twitter.com/alimanfoo

[jakirkham]

Are you able to reproduce with the latest 2.2.0 RC?

[jakirkham]

So just tried this with the latest Zarr RC, 2.2.0rc3, and am unable to reproduce this issue. It's likely this was fixed in PR ( #183 ), which changed how chunks=False is handled and added a test for it. As such going to close this out as resolved. Though feel free to comment if you still have issues with the RC. Thanks for the report.