SkySend

Parallel Chunk Uploads and Performance Improvements

🎨 Improvements

• web: Upload chunks are now sent in parallel (up to 3 concurrent, 10 MB each) instead of sequentially (50 MB each), dramatically improving upload speed in Chrome, Brave, and Edge through reverse proxies like Traefik
• server: Chunk upload endpoint accepts an index query parameter and reassembles chunks in-order on the server, ensuring data integrity with parallel client uploads
• server: In-order chunks are now streamed directly to storage without buffering, eliminating unnecessary memory copies on the hot path
• server: Optimized S3 multipart upload buffering to avoid full-buffer reallocation on every chunk append
• server: S3 part uploads now run as a concurrent pool with smooth backpressure - waits for one upload slot to free up instead of draining everything, giving consistent throughput instead of burst-stop cycles

📚 Documentation

• docs: Updated architecture diagram with chunked upload flow (init, parallel chunks with index, finalize)
• docs: Added chunked upload API documentation (init, chunk, finalize endpoints) to developer guide
• docs: Added chunked upload endpoints to API overview table

🐳 Docker

• Image: skyfay/skysend:v2.2.1
• Also tagged as: latest, v2
• Platforms: linux/amd64, linux/arm64