Apache Polaris (incubating)

Apache Polaris™ is an open-source, fully-featured catalog for Apache Iceberg™. It implements Iceberg's REST API, enabling seamless multi-engine interoperability across a wide range of platforms, including Apache Doris™, Apache Flink®, Apache Spark™, StarRocks, and Trino.

Documentation is available at https://polaris.apache.org, including Polaris management API doc and Apache Iceberg REST API doc.

Community

Join us on the Apache Polaris public chat (no invite needed).

Development

See CONTRIBUTING for contribution requirements.

Building and Running

Apache Polaris is organized into the following modules:

• polaris-core - The main Polaris entity definitions and core business logic
• polaris-server - The Polaris REST API server
• polaris-eclipselink - The Eclipselink implementation of the MetaStoreManager interface

Apache Polaris is built using Gradle with Java 21+ and Docker 27+.

• ./gradlew build - To build and run tests. Make sure Docker is running, as the integration tests depend on it.
• ./gradlew assemble - To skip tests.
• ./gradlew test - To run unit tests and integration tests.
• ./gradlew runApp - To run the Polaris server locally on localhost:8181.
• ./regtests/run_spark_sql.sh - To connect from Spark SQL. Here are some example commands to run in the Spark SQL shell:

create database db1;
show databases;
create table db1.table1 (id int, name string);
insert into db1.table1 values (1, 'a');
select * from db1.table1;

Apache Polaris supports the following optional build options:

• -PeclipseLink=true – Enables the EclipseLink extension.
• -PeclipseLinkDeps=[groupId]:[artifactId]:[version],... – Specifies one or more additional dependencies for EclipseLink (e.g., JDBC drivers), separated by commas.

More build and run options

Running in Docker

• docker build -t localhost:5001/polaris:latest . - To build the image.
• docker run -p 8181:8181 localhost:5001/polaris:latest - To run the image in standalone mode.

Running in Kubernetes

• ./run.sh - To run Polaris as a mini-deployment locally. This will create one pod that bind itself to ports 8181 and 8182.
• kubectl port-forward svc/polaris-service -n polaris 8181:8181 8182:8182 - To create secure connections between a local machine and a pod within the cluster for both service and metrics endpoints.
  • Currently supported metrics endpoints:
    • localhost:8182/metrics
    • localhost:8182/healthcheck
• kubectl get pods -n polaris - To check the status of the pods.
• kubectl get deployment -n polaris - To check the status of the deployment.
• kubectl describe deployment polaris-deployment -n polaris - To troubleshoot if things aren't working as expected.

Running regression tests

• ./regtests/run.sh - To run regression tests in another terminal.
• docker compose up --build --exit-code-from regtest - To run regression tests in a Docker environment.

Building docs

• Docs are generated using Redocly. To regenerate them, run the following commands from the project root directory.

docs/build

License

Apache Polaris is under the Apache License Version 2.0. See the LICENSE.

ASF Incubator disclaimer

Apache Polaris™ is an effort undergoing incubation at The Apache Software Foundation (ASF), sponsored by the Apache Incubator. Incubation is required of all newly accepted projects until a further review indicates that the infrastructure, communications, and decision making process have stabilized in a manner consistent with other successful ASF projects. While incubation status is not necessarily a reflection of the completeness or stability of the code, it does indicate that the project has yet to be fully endorsed by the ASF.

_{Apache®, Apache Polaris™, Apache Iceberg™, Apache Spark™ are either registered trademarks or trademarks of the Apache Software Foundation in the United States and/or other countries.}