issue_comments: 575736943

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https://github.com/pydata/xarray/issues/3701#issuecomment-575736943 https://api.github.com/repos/pydata/xarray/issues/3701 575736943 MDEyOklzc3VlQ29tbWVudDU3NTczNjk0Mw== 2448579 2020-01-17T18:15:26Z 2020-01-17T18:15:26Z MEMBER

yes. you'll need to have 1 chunk along the dimension being reduced (here 'time').

The reason is that there is no approximate quantile algorithm implemented in dask. So this implementation is just calling np.nanpercentile on each block of the array. If you're reducing along time, each block must have the entire time axis for this to work.

 
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