[Epic] Worker Pool Improvements: Dynamic Scaling & Graceful Drain #17

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opened 2026-02-09 21:35:11 +03:00 by NiXTheDev · 1 comment

NiXTheDev commented

2026-02-09 21:35:11 +03:00

(Migrated from github.com)

Epic Overview

This epic tracks the complete overhaul of the worker pool system with dynamic scaling and improved shutdown handling.

Goals

Dynamic Worker Pool - Scale workers based on demand rather than pre-allocating
Smart Shutdown - Optionally drain queue during shutdown instead of rejecting tasks
Better Observability - Track worker metrics and pool health

Success Criteria

Pool starts with minimal workers
Scales up under load within configured limits
Scales down idle workers after timeout
Graceful shutdown works in Docker
All tests pass
Documentation updated

#14 - Worker Pool V2 (Dynamic Scaling) ✅
#15 - Smart Worker Queue Drain ✅
#16 - Integration Tests ✅
#20 - Docker Graceful Shutdown Testing ✅

Implementation Summary

Worker Pool V2

Lazy initialization (starts with initialWorkers)
Auto-scales up to maxWorkers when queue grows
Scales down idle workers after timeout
Batch worker spawning for efficiency
Shutdown scaling (spawns beyond maxWorkers during drain)

Graceful Shutdown

GRACEFUL_DRAIN configuration option
Processes pending tasks before exiting
Docker-compatible timeout (default 8s, max 9.5s)
Signal handling (SIGTERM/SIGINT)

Testing

9 WorkerPoolV2 unit tests
6 Docker integration tests
All 77 tests passing

Documentation

README updated with new env vars
Docker deployment section added
.env.example updated
Docker test script created

Status: COMPLETE ✅

All epic goals achieved. Ready for production use.

## Epic Overview This epic tracks the complete overhaul of the worker pool system with dynamic scaling and improved shutdown handling. ## Goals 1. **Dynamic Worker Pool** - Scale workers based on demand rather than pre-allocating 2. **Smart Shutdown** - Optionally drain queue during shutdown instead of rejecting tasks 3. **Better Observability** - Track worker metrics and pool health ## Success Criteria - [x] Pool starts with minimal workers - [x] Scales up under load within configured limits - [x] Scales down idle workers after timeout - [x] Graceful shutdown works in Docker - [x] All tests pass - [x] Documentation updated ## Related Issues - #14 - Worker Pool V2 (Dynamic Scaling) ✅ - #15 - Smart Worker Queue Drain ✅ - #16 - Integration Tests ✅ - #20 - Docker Graceful Shutdown Testing ✅ ## Implementation Summary ### Worker Pool V2 - Lazy initialization (starts with `initialWorkers`) - Auto-scales up to `maxWorkers` when queue grows - Scales down idle workers after timeout - Batch worker spawning for efficiency - Shutdown scaling (spawns beyond maxWorkers during drain) ### Graceful Shutdown - `GRACEFUL_DRAIN` configuration option - Processes pending tasks before exiting - Docker-compatible timeout (default 8s, max 9.5s) - Signal handling (SIGTERM/SIGINT) ### Testing - 9 WorkerPoolV2 unit tests - 6 Docker integration tests - All 77 tests passing ### Documentation - README updated with new env vars - Docker deployment section added - .env.example updated - Docker test script created --- **Status: COMPLETE** ✅ All epic goals achieved. Ready for production use.

NiXTheDev commented

2026-02-13 17:40:33 +03:00

(Migrated from github.com)

All epic goals achieved:

✅ Worker Pool V2 implemented with dynamic scaling
✅ Smart shutdown with graceful drain
✅ Docker graceful shutdown tested and verified
✅ All 77 tests passing
✅ Documentation complete

Docker testing confirmed:

docker run: ✓
docker compose stop: ✓
Worker Pool V2: ✓
Immediate shutdown: ✓
SIGINT/SIGTERM: ✓

Ready for production!

All epic goals achieved: ✅ Worker Pool V2 implemented with dynamic scaling ✅ Smart shutdown with graceful drain ✅ Docker graceful shutdown tested and verified ✅ All 77 tests passing ✅ Documentation complete Docker testing confirmed: - docker run: ✓ - docker compose stop: ✓ - Worker Pool V2: ✓ - Immediate shutdown: ✓ - SIGINT/SIGTERM: ✓ Ready for production!