issue_comments: 404429223

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https://github.com/pydata/xarray/issues/2278#issuecomment-404429223 https://api.github.com/repos/pydata/xarray/issues/2278 404429223 MDEyOklzc3VlQ29tbWVudDQwNDQyOTIyMw== 1197350 2018-07-12T08:15:43Z 2018-07-12T08:16:02Z MEMBER

Any idea about how serious this is and/or where it's coming from?

The source of the bug is that encoding metadata chunks (which describes the chunk size of the underlying zarr store) is automatically getting populated when you load the zarr store (ds = xr.open_zarr('data.zarr')), and this encoding metadata is being preserved as you transform (sub-select) the dataset. Some possible solutions would be to

  1. Not put chunks into encoding at all.
  2. Figure out a way to strip chunks when performing selection operations or other operations that change shape.

Idea 1 is easier but would mean discarding some relevant metadata about encoding. This would break round-tripping of the un-modified zarr dataset.

 
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