paul-rogers commented on a change in pull request #2060: DRILL-7706: Implement
Drill RDBMS Metastore for Tables component
URL: https://github.com/apache/drill/pull/2060#discussion_r410822496
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File path: metastore/rdbms-metastore/README.md
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+# RDBMS Metastore
+
+RDBMS Metastore implementation allows to store Drill Metastore metadata in
configured RDBMS.
+
+## Configuration
+
+Currently, RDBMS Metastore is not default Drill Metastore implementation.
+To enable RDBMS Metastore create `drill-metastore-override.conf` and indicate
RDBMS Metastore class:
+
+```
+drill.metastore: {
+ implementation.class: "org.apache.drill.metastore.rdbms.RdbmsMetastore"
+}
+```
+
+### Connection properties
+
+Data source connection properties allows to indicate how to connect to Drill
Metastore database.
+
+`drill.metastore.rdbms.data_source.driver` - driver class name. Required.
+Note, driver must be included into Drill classpath prior to start up for all
databases except of SQLite.
+
+`drill.metastore.rdbms.data_source.url` - connection url. Required.
+
+`drill.metastore.rdbms.data_source.username` - database user on whose behalf
the connection is
+being made. Optional, if database does not require user to connect.
+
+`drill.metastore.rdbms.data_source.password` - database user's password.
+Optional, if database does not require user's password to connect.
+
+`drill.metastore.rdbms.data_source.properties` - specifies properties which
will be used
+during data source creation. See list of available [Hikari
properties](https://github.com/brettwooldridge/HikariCP)
+for more details.
+
+### Default configuration
+
+Out of the box, Drill RDBMS Metastore is configured to use embedded file
system based SQLite database.
Review comment:
Out of the box, **the** Drill RDBMS Metastore is configured to use **the**
embedded file system based SQLite database.
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