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/3961#issuecomment-628985289,https://api.github.com/repos/pydata/xarray/issues/3961,628985289,MDEyOklzc3VlQ29tbWVudDYyODk4NTI4OQ==,45645265,2020-05-15T02:14:48Z,2020-05-15T02:14:48Z,NONE,"Using:

- xarray=0.15.1
- dask=2.14.0
- netcdf4=1.5.3

I have experienced this issue as well when writing netcdf using `xr.save_mfdataset` on a dataset opened using `xr.open_mfdataset`. As described by OP it hangs when using `lock=None` (default behavior) on `xr.open_mfdataset()`, but works fine when using `lock=False`.","{""total_count"": 1, ""+1"": 1, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,597657663