issue_comments: 682337819

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https://github.com/pydata/xarray/issues/4372#issuecomment-682337819 https://api.github.com/repos/pydata/xarray/issues/4372 682337819 MDEyOklzc3VlQ29tbWVudDY4MjMzNzgxOQ== 5821660 2020-08-28T05:45:25Z 2020-08-28T05:45:25Z MEMBER

Another questions are, why does this kwarg exist in dask and why do they not rechunk per default?

Trying to answer this from looking at the dask code.

  • allow_rechunk=False: catch chunking problems in core and non-core-dimensions and raise an error. This helps to prevent users running into loading huge dask arrays into memory without further notice.
  • allow_rechunk=True: blockwise is called with align_arrays=True per default which means automatic rechunking for all arrays (core and non-core dimensions). Users can use this, if they are sure the system can handle possible large amounts of data.
 
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