html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,performed_via_github_app,issue
https://github.com/pydata/xarray/issues/2007#issuecomment-375431424,https://api.github.com/repos/pydata/xarray/issues/2007,375431424,MDEyOklzc3VlQ29tbWVudDM3NTQzMTQyNA==,1197350,2018-03-22T19:35:50Z,2018-03-22T19:35:50Z,MEMBER,"Very useful suggestion.

> Also I cannot really think of an easy way to append the first elements to the end of the dataset and then calculate rolling.

We already support a different type of ""rolling"" with periodicity
http://xarray.pydata.org/en/latest/generated/xarray.DataArray.roll.html?highlight=roll
and it is straightforward to apply roll operations at the variable level:
https://github.com/pydata/xarray/blob/master/xarray/core/variable.py#L1007-L1026

I suspect this would not be too hard to implement.
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