issue_comments: 729795030

This data as json

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/4591#issuecomment-729795030 https://api.github.com/repos/pydata/xarray/issues/4591 729795030 MDEyOklzc3VlQ29tbWVudDcyOTc5NTAzMA== 6042212 2020-11-18T16:29:18Z 2020-11-18T16:29:18Z CONTRIBUTOR

I don't think it's fsspec, the HTTPFileSystem and file objects are known to serialise.

However ```

distributed.protocol.serialize(dsc.surface.mean().data.dask['open_dataset-27832a1f850736a8d9a11a882ad06230surface-3b6f5b6a90c2cfa65379d3bfae22126f']) ({'serializer': 'error'}, ...) ``` (that's one of the keys I picked from the graph at random, your keys may differ) I can't say why this object is in the graph where perhaps it wasn't before, but it has a reference to a "CopyOnWriteArray", which sounds like a buffer owned by something else and probably the non-serializable part. Digging find a contained "<xarray.backends.h5netcdf_.H5NetCDFArrayWrapper at 0x17e669ad0>" which is not serializable - so maybe xarray can do something about this.

 
{
    "total_count": 0,
    "+1": 0,
    "-1": 0,
    "laugh": 0,
    "hooray": 0,
    "confused": 0,
    "heart": 0,
    "rocket": 0,
    "eyes": 0
}
   745801652