Is it possible to specify an io_root_manager at the graph level in the new API? This would be very useful instead of having to specify it at the op level

@Kobi Warning: I am very new to Dagster, but I think I know this one. You can configure a default IO manager at the graph level. I did that via my repo file where I set the config for the graph: https://github.com/xmarcosx/dagster-etl/blob/master/alcozer/repository.py

@marcos is correct here -- to expand on that, the resource with the key

io_manager

will be used as the default io_manager for all ops within your job.