Well, at present, I am using v20.03 for production data management. I need to verify the ACL function to adapt to the existing version. If I upgrade, it is not friendly to me 
In that case, I still face the problem of importing a lot of data.For some reasons, I have to use pydgraph to import data into dgraph.What makes me sad is that it takes a long time to import a large amount of data . Every time it import data one by one 
I got this advice in the community, but I haven’t found a way to upload multiple nodes for per mutation.