windows lmdb storage open error

[kaonick]

Simple test sample below:

import os
import zarr
store = zarr.LMDBStore('array.mdb')
z = zarr.zeros((10, 10), chunks=(5, 5), store=store, overwrite=True)
z[...] = 42
store.close()  # don't forget to call this when you're done

Problem description

Crash in storage.py when open.lmdb(,x).
I think cause by map_size too big.
original:
map_size = (2**40 if sys.maxsize >= 2**32 else 2**28)
will raise
File "D:\Programs\anaconda3\envs\py36\lib\site-packages\zarr\storage.py", line 1613, in __init__ self.db = lmdb.open(path, **kwargs) lmdb.Error: D:\WS\WS_Python\Homeworks\20190927pytorch_pipeline_zarr\array.mdb: �ϺЪ��Ŷ������C
to change map_size =500000000 then just ok.

Version and installation information

Please provide the following:

• zarr.__version__ :2.3.2
• Version of Python interpreter:3.6.6
• Operating system (Windows 10)
• How Zarr was installed (using pip into virtual environment)