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## Summary This chunk details the planning and implementation of a horizontally scalable S3-compatible storage architecture for the Filecoin Gateway. The user requested a plan where stateless S3 frontend proxy nodes would handle request routing and load balancing, while backend Kuri storage nodes maintain independent RIBS blockstore data, all coordinated through a shared YCQL database tracking object placement. The assistant responded by first creating a comprehensive architecture roadmap document (`scalable-roadmap.md`), then immediately proceeding to implement the planned changes. ## Key Implementations The assistant completed two major phases of implementation. **Phase 1** modified the existing Kuri node codebase to include node identification, updating the `S3Object` interface with `NodeID` and `ExpiresAt` fields, the CQL object index to read/write these fields, and the bucket and region implementations to pass node IDs from environment configuration (`FGW_NODE_ID`). **Phase 2** created an entirely new S3 frontend proxy package (`server/s3frontend/`) with a stateless HTTP server implementing round-robin request distribution, a backend pool with health checking, and dependency injection via `fx.go`. **Phase 3** began implementing YCQL-based read routing, where the frontend queries the shared database to determine which specific Kuri node holds a requested object before directing GET requests accordingly. ## Architecture & Future Work The architecture follows a clean separation of concerns: frontend proxies remain completely stateless for horizontal scalability, while backend Kuri nodes operate independently without data replication, achieving performance through parallelism rather than redundancy. Multipart uploads are designed to be assembled from parts distributed across multiple nodes, with the coordinator node only needing links (not full data) for assembly. Remaining phases will implement multipart coordination (Phase 4), comprehensive testing including read-after-write guarantees (Phase 5), and further polish of the distributed architecture.

From Blueprint to Cluster: Building a Horizontally Scalable S3 Architecture for the Filecoin Gateway 5751 words

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