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/4449#issuecomment-697081834,https://api.github.com/repos/pydata/xarray/issues/4449,697081834,MDEyOklzc3VlQ29tbWVudDY5NzA4MTgzNA==,6249613,2020-09-23T02:19:16Z,2020-09-23T02:19:16Z,NONE,"Thanks for the quick reply and for that pointer to use `ds.load()` instead. That method is new to me--it's always good to learn a new trick. 
That solves it for my use case.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,706507153
https://github.com/pydata/xarray/issues/4449#issuecomment-696997402,https://api.github.com/repos/pydata/xarray/issues/4449,696997402,MDEyOklzc3VlQ29tbWVudDY5Njk5NzQwMg==,1217238,2020-09-22T21:41:01Z,2020-09-22T21:41:01Z,MEMBER,"The work around is to call `ds1.load()` or use `ds2 = ds1.compute()` instead of calling `.copy(deep=True)`

The direct source of the issue here is: https://github.com/pydata/xarray/pull/4379

We probably should have been more careful with that change, because it is technically a regression. Previously we would always load data into NumPy arrays when doing a deep copy, but after that change the underlying data structures are deep-copied rather than being loaded into NumPy. That's probably more consistent with what users would expect _in general_ from a ""deep copy"" but is definitely a change from the previous behavior.","{""total_count"": 2, ""+1"": 2, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,706507153
https://github.com/pydata/xarray/issues/4449#issuecomment-696991642,https://api.github.com/repos/pydata/xarray/issues/4449,696991642,MDEyOklzc3VlQ29tbWVudDY5Njk5MTY0Mg==,2448579,2020-09-22T21:27:13Z,2020-09-22T21:27:13Z,MEMBER,Would `ds1.load()` work for this case?,"{""total_count"": 2, ""+1"": 2, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,706507153
https://github.com/pydata/xarray/issues/4449#issuecomment-696980120,https://api.github.com/repos/pydata/xarray/issues/4449,696980120,MDEyOklzc3VlQ29tbWVudDY5Njk4MDEyMA==,5635139,2020-09-22T21:04:04Z,2020-09-22T21:04:04Z,MEMBER,"Thanks for the issue @blaylockbk 

I think this is caused by https://github.com/pydata/xarray/pull/4426, which defers to copy-on-write rather than make an extra copy.

Do you need this behavior per se?","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,706507153