#ft just FYI, this is to follow-up on conversation with @alangenfeld
**Goal:** implement a single `spark_solid` that you can _actually_ develop on locally and deploy on EMR without overhauling all your code
This RFC substantially refactors `dagster-spark` and EMR.
The main code to look at is `dagster_aws/emr/solids.py#47`, `create_spark_solid()`, which defines a solid usable in either context. The test in `dagster_aws_tests/emr_tests/test_combined_solid.py` exercises it.