dengzhhu653 commented on code in PR #5629:
URL: https://github.com/apache/hive/pull/5629#discussion_r1948440325
##########
packaging/src/docker/README.md:
##########
@@ -210,3 +210,54 @@ docker compose down
select count(distinct a) from hive_example;
select sum(b) from hive_example;
```
+
+#### Hive Schema Tool
+
+`Hive Schema Tool` is located in the Docker Image at
`/opt/hive/bin/schematool`.
+
+By default, system libraries such as `information_schema` for HiveServer2 are
not created.
+To create system libraries for a HiveServer2 instance,
+users need to configure HiveServer2 to use a remote Hive Metastore Server and
use a database other than embedded Derby for the Hive Metastore Server.
+
+Assuming `SDKMAN!` and `Docker CE` are installed, a possible use case is as
follows.
+Create a `compose.yaml` file in the current directory,
+
+```yaml
+services:
+ some-postgres:
+ image: postgres:17.2-bookworm
+ environment:
+ POSTGRES_PASSWORD: "example"
+ metastore-standalone:
+ image: apache/hive:4.0.1
+ depends_on:
+ - some-postgres
+ environment:
+ SERVICE_NAME: metastore
+ DB_DRIVER: postgres
+ SERVICE_OPTS: >-
+ -Djavax.jdo.option.ConnectionDriverName=org.postgresql.Driver
+
-Djavax.jdo.option.ConnectionURL=jdbc:postgresql://some-postgres:5432/postgres
+ -Djavax.jdo.option.ConnectionUserName=postgres
+ -Djavax.jdo.option.ConnectionPassword=example
+ volumes:
+ -
~/.m2/repository/org/postgresql/postgresql/42.7.5/postgresql-42.7.5.jar:/opt/hive/lib/postgres.jar
+ hiveserver2-standalone:
+ image: apache/hive:4.0.1
+ depends_on:
+ - metastore-standalone
+ environment:
+ SERVICE_NAME: hiveserver2
+ SERVICE_OPTS: >-
+ -Dhive.metastore.uris=thrift://metastore-standalone:9083
Review Comment:
do you post the command the HS2 trying to initialize the schema, it could
find at the container's log.
this is the sys table, the actual data is stored at the postgres, HMS
doesn't provide APIs to scan through postgres tables, like `select * from
postgres."TBLS"` , the job is carried out by HS2, which connects to postgres
and pushes the query down to the postgres.
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