issue_comments: 560115162

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https://github.com/pydata/xarray/issues/3350#issuecomment-560115162 https://api.github.com/repos/pydata/xarray/issues/3350 560115162 MDEyOklzc3VlQ29tbWVudDU2MDExNTE2Mg== 2448579 2019-12-01T14:33:08Z 2019-12-01T14:33:08Z MEMBER

The size zero dimension is a give-away that the problem has something to do with dask's _meta propagation.

I think the size 0 results from chunk(). With chunk(2) other weird errors come up:

TypeError: tuple indices must be integers or slices, not tuple

We were specifying a name for the chunked array in Dataset.chunk but this name was independent of chunk sizes i.e. ds.chunk() & ds.chunk(2) have the same names which ends up confusing dask (I think). #3584 fixes this by providing chunks as an input to tokenize. I also needed to add __dask_tokenize__ to ReprObject so that names were reproducible after going through a to_temp_dataset transformation

 
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