This feature work is to be able to support in Hive Metastore to be able to configure data connectors for remote datasources and map databases. We currently have support for remote tables via StorageHandlers like JDBCStorageHandler and HBaseStorageHandler.
Data connectors are a natural extension to this where we can map an entire database or catalogs instead of individual tables. The tables within are automagically mapped at runtime. The metadata for these tables are not persisted in Hive. They are always mapped and built at runtime.
With this feature, we introduce a concept of type for Databases in Hive. NATIVE vs REMOTE. All current databases are NATIVE. To create a REMOTE database, the following syntax is to be used
CREATE REMOTE DATABASE remote_db USING <dataconnector> WITH DCPROPERTIES (....);
Will attach a design doc to this jira.