feat(store): implement pluggable cloud storage for HStore#3081
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…age with S3 support out of the box
…e config and factory - Add AppConfigCloudStorageTest with 6 tests for CloudStorageSpringConfig conversion and defaults - Add CloudStorageProviderFactoryTest with 8 tests for provider discovery and lifecycle management - Add CloudStorageConfigTest with 17 tests for config getters/setters validation - Tests target previously uncovered cloud storage initialization code - Improves commit 9aaad11 coverage from 13.32% to ~45%
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Purpose
This PR introduces a cloud storage architecture for HugeGraph Store (HStore). In cloud-native environments, storage nodes are ephemeral, making reliance on local disk storage a single point of failure. This implementation decouples the storage layer from local disk dependencies, allowing SST files to be offloaded to durable, scalable cloud storage providers.
Key Changes
Pluggable Architecture
CloudStorageProviderSPI interface to enable extensible storage backends.CloudStorageProviderFactoryfor seamless provider discovery and lifecycle management.S3 Provider Implementation
hg-store-cloud-s3module, leveraging AWS SDK v2 for production-ready S3/S3 compatible storage interaction.Lifecycle & Event Integration
CloudStorageEventListenerwithRocksDBFactory. This hooks into critical SST lifecycle events (onTableFileCreated,onTableFileDeleted) to ensure synchronized state between local RocksDB and cloud storage.onDBCreated) to backfill pre-existing files and read-miss on-demand hydration to ensure data availability.Infrastructure & Testing
docker/cloud-storage/using MinIO.test-graph-queries-and-sst.sh) to verify end-to-end data durability and query consistency.Implementation Highlights
META-INF/services.RocksdbEventListenerwithinRocksDBFactoryto intercept file operations without modifying core RocksDB logic.onReadMissto prevent redundant hydration requests during high-concurrency read scenarios.Verifying These Changes
CloudStorageConfigTest), factory registration, and event listener logic.docker-composesetup with MinIO.application.ymlbindings for credentials, bucket management, and sync intervals.Impact
LICENSEandNOTICEaccordingly.cloud.storagenamespace toapplication.yml(disabled by default).Documentation
hugegraph-store/docs/pluggable-cloud-storage-architecture.md.