Clears adapters before registering to fix dbt-server cacheing behavior (

#4218)

CHANGELOG.md

@@ -17,6 +17,7 @@
 - Bump artifact schema versions for 1.0.0: manifest v4, run results v4, sources v3. Notable changes: schema test + data test nodes are renamed to generic test + singular test nodes; freshness threshold default values ([#4191](https://github.com/dbt-labs/dbt-core/pull/4191))
 - Speed up node selection by skipping `incorporate_indirect_nodes` if not needed ([#4213](https://github.com/dbt-labs/dbt-core/issues/4213), [#4214](https://github.com/dbt-labs/dbt-core/issues/4214))
 - When on_schema_change is set, pass common columns as dest_columns in incremental merge macros ([#4144](https://github.com/dbt-labs/dbt-core/issues/4144), [#4170](https://github.com/dbt-labs/dbt-core/pull/4170))
+- Clear adapters before registering in lib module config generation ([#4218](https://github.com/dbt-labs/dbt-core/pull/4218))
 
 Contributors:
 - [@kadero](https://github.com/kadero) ([#3955](https://github.com/dbt-labs/dbt-core/pull/3955))

core/dbt/lib.py

@@ -21,6 +21,9 @@ def get_dbt_config(project_dir, single_threaded=False):
     config = RuntimeConfig.from_args(RuntimeArgs(
         project_dir, profiles_dir, single_threaded
     ))
+    # Clear previously registered adapters--
+    # this fixes cacheing behavior on the dbt-server
+    dbt.adapters.factory.reset_adapters()
     # Load the relevant adapter
     dbt.adapters.factory.register_adapter(config)