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.

Subscribe to the dev mailing list to join discussions via email or browse the archives. Check out the CONTRIBUTING guide for contribution guidelines.

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.
  • Optional build options:
    • docker build -t localhost:5001/polaris:latest --build-arg ECLIPSELINK=true . - Enables the EclipseLink extension.
    • docker build -t localhost:5001/polaris:latest --build-arg ECLIPSELINK=true --build-arg ECLIPSELINK_DEPS=[groupId]:[artifactId]:[version],... . – Enables the EclipseLink extension with one or more additional dependencies for EclipseLink (e.g. JDBC drivers) separated by commas.
• 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.
  • Optional run options:
    • ./run.sh -b "ECLIPSELINK=true" - Enables the EclipseLink extension.
    • ./run.sh -b "ECLIPSELINK=true;ECLIPSELINK_DEPS=[groupId]:[artifactId]:[version],..." – Enables the EclipseLink extension with one or more additional dependencies for EclipseLink (e.g. JDBC drivers) separated by commas.
• 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 Hugo using the Docsy theme.
• To view the site locally, run

  site/bin/run-hugo-in-docker.sh

• See README in site/ for more information.

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.}