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### Highlights
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-**HMS Federation Support**: Added support for Hive Metastore (HMS) federation, enabling integration with existing Hive metastores.
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-**Modularized Federation**: Introduced modularized federation architecture to support multiple catalog types and improve extensibility.
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-**External Authentication**: Added comprehensive support for external identity providers including Keycloak integration and Helm chart configuration options.
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-**Python Client Distribution**: The Python client is now packaged and distributed as a proper Python package for easier installation and usage.
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-**Catalog Federation CLI**: Extended the CLI with support for managing federated catalogs, making it easier to configure and operate catalog federation.
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-**MinIO**: Added MinIO integration support with comprehensive getting started documentation.
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### Upgrade notes
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### Breaking changes
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### New Features
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- Added Catalog configuration for S3 and STS endpoints. This also allows using non-AWS S3 implementations.
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The realm-level feature flag `ALLOW_SETTING_S3_ENDPOINTS` (default: true) may be used to disable this
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functionality.
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- The `IMPLICIT` authentication type enables users to create federated catalogs without explicitly
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providing authentication parameters to Polaris. When the authentication type is set to `IMPLICIT`,
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the authentication parameters are picked from the environment or configuration files.
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providing authentication parameters to Polaris. When the authentication type is set to `IMPLICIT`,
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the authentication parameters are picked from the environment or configuration files.
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- The `DEFAULT_LOCATION_OBJECT_STORAGE_PREFIX_ENABLED` feature was added to support placing tables
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at locations that better optimize for object storage.
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- The `LIST_PAGINATION_ENABLED` (default: false) feature flag can be used to enable pagination
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in the Iceberg REST Catalog API.
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- The Helm chart now supports Pod Disruption Budgets (PDBs) for Polaris components. This allows users to define
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the minimum number of pods that must be available during voluntary disruptions, such as node maintenance.
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- Feature configuration `PURGE_VIEW_METADATA_ON_DROP` was added to allow dropping views without purging their metadata files.
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- Introduced S3 path-style access support for improved compatibility with S3-compatible storage systems.
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- Enhanced Python client with integration tests and improved error handling.
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- Introduced extensible pagination token implementation for better API performance.
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- Added support for `s3a` scheme in addition to existing S3 schemes.
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- Enhanced Helm chart with support for external authentication configuration and relational JDBC backend options.
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- Added comprehensive diagnostics and monitoring capabilities throughout the system.
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- Introduced bootstrap command options to specify custom schema files for database initialization.
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- Added refresh credentials endpoint configuration to LoadTableResponse for AWS, Azure, and GCP. Enabling
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automatic storage credential refresh per table on the client side. Java client version >= 1.8.0 is required.
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The endpoint path is always returned when using vended credentials, but clients must enable the
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refresh-credentials flag for the desired storage provider.
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### Changes
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- Polaris Management API clients must be prepared to deal with new attributes in `AwsStorageConfigInfo` objects.
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### Deprecations
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* The property `polaris.active-roles-provider.type` is deprecated in favor of
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`polaris.authentication.active-roles-provider.type`. The old property is still supported, but will be removed in a
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future release.
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- The property `polaris.active-roles-provider.type` is deprecated for removal.
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- The `ActiveRolesProvider` interface is deprecated for removal.
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