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/1014#issuecomment-248633542,https://api.github.com/repos/pydata/xarray/issues/1014,248633542,MDEyOklzc3VlQ29tbWVudDI0ODYzMzU0Mg==,1197350,2016-09-21T14:42:26Z,2016-09-21T14:42:26Z,MEMBER,"Update: the underlying data of the variable that was causing the error was a numpy.memmap. Tokenizing works with standard memmaps; however, this memmap was produced by adding together two other memmaps. The resuling object has a `.filename` attribute, but that attribute's values is `None`. I was able to overcome the issue by converting to a numpy array.

I think this is a problem with the way dask tokenizes memmaps, not with xarray. I will raise an issue on dask and close this issue.
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