xarray cacheing NetCDF files #277
Description
When reading data xarray uses a cache. This can cause problems because xarray doesn't check if the file has changed on disk. The result is either reading out-of-date data, or errors about array sizes not matching.
There is some discussion here: pydata/xarray#4240
From that discussion: Closing datasets with the ds.close() method may work. Clear the file cache with: xarray.backends.file_manager.FILE_CACHE.clear()