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Libre threads (#5303)
# Description of Changes <!-- Please provide a summary of the changes, including: - What was changed - Why the change was made - Any challenges encountered Closes #(issue_number) --> --- ## Checklist ### General - [ ] I have read the [Contribution Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md) - [ ] I have read the [Stirling-PDF Developer Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md) (if applicable) - [ ] I have read the [How to add new languages to Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md) (if applicable) - [ ] I have performed a self-review of my own code - [ ] My changes generate no new warnings ### Documentation - [ ] I have updated relevant docs on [Stirling-PDF's doc repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/) (if functionality has heavily changed) - [ ] I have read the section [Add New Translation Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md#add-new-translation-tags) (for new translation tags only) ### Translations (if applicable) - [ ] I ran [`scripts/counter_translation.py`](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/docs/counter_translation.md) ### UI Changes (if applicable) - [ ] Screenshots or videos demonstrating the UI changes are attached (e.g., as comments or direct attachments in the PR) ### Testing (if applicable) - [ ] I have tested my changes locally. Refer to the [Testing Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md#6-testing) for more details.
This commit is contained in:
Anthony Stirling
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# Stirling-PDF with Remote UNO Servers
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This docker-compose configuration demonstrates running Stirling-PDF with **separate UNO server containers** for LibreOffice document conversion, enabling horizontal scaling and better resource isolation.
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## Architecture
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```
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┌─────────────────────┐
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│ Stirling-PDF │
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│ (Main App) │
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│ │
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│ Uses BlockingQueue │
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│ pool to distribute │
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│ load across servers │
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└──────┬──────┬───────┘
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│ │
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│ │ Remote endpoints
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│ │ (hostLocation: remote)
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│ │
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┌───▼──┐ ┌─▼────┐
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│ UNO │ │ UNO │
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│ #1 │ │ #2 │
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│:2002 │ │:2002 │
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└──────┘ └──────┘
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```
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## Key Features Demonstrated
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### 1. Remote UNO Server Configuration
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- **hostLocation: "remote"** - Required for cross-container communication
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- **BlockingQueue pool** - Optimal endpoint selection under load
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- **Health checks** - Each UNO server has `unoping` health check
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### 2. Environment Variable Configuration
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```yaml
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PROCESS_EXECUTOR_AUTO_UNO_SERVER: "false" # Disable local servers
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# Define remote endpoints (Spring Boot list syntax)
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PROCESS_EXECUTOR_UNO_SERVER_ENDPOINTS_0_HOST: "unoserver1"
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PROCESS_EXECUTOR_UNO_SERVER_ENDPOINTS_0_PORT: "2002"
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PROCESS_EXECUTOR_UNO_SERVER_ENDPOINTS_0_HOST_LOCATION: "remote" # Critical!
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PROCESS_EXECUTOR_UNO_SERVER_ENDPOINTS_0_PROTOCOL: "http"
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PROCESS_EXECUTOR_UNO_SERVER_ENDPOINTS_1_HOST: "unoserver2"
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PROCESS_EXECUTOR_UNO_SERVER_ENDPOINTS_1_PORT: "2002"
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PROCESS_EXECUTOR_UNO_SERVER_ENDPOINTS_1_HOST_LOCATION: "remote"
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PROCESS_EXECUTOR_UNO_SERVER_ENDPOINTS_1_PROTOCOL: "http"
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```
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### 3. Session Limit
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```yaml
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PROCESS_EXECUTOR_SESSION_LIMIT_LIBRE_OFFICE_SESSION_LIMIT: "2"
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```
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Should match endpoint count for optimal concurrency.
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## Usage
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### Start the Stack
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```bash
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docker compose -f docker-compose-latest-security-remote-uno.yml up -d
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```
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### Monitor Logs
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```bash
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# Watch all services
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docker compose -f docker-compose-latest-security-remote-uno.yml logs -f
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# Watch just UNO servers
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docker compose -f docker-compose-latest-security-remote-uno.yml logs -f unoserver1 unoserver2
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# Watch main app
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docker compose -f docker-compose-latest-security-remote-uno.yml logs -f stirling-pdf
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```
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### Health Check Status
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```bash
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docker compose -f docker-compose-latest-security-remote-uno.yml ps
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```
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Should show all services healthy:
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```
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NAME STATUS
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Stirling-PDF-Security-Remote-UNO Up (healthy)
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UNO-Server-1 Up (healthy)
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UNO-Server-2 Up (healthy)
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```
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### Test Conversion Load Distribution
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Upload multiple documents for conversion and watch the logs - you'll see requests distributed across both UNO servers via the BlockingQueue pool.
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## Scaling UNO Servers
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### Add More Servers
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To add a 3rd UNO server:
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1. Add service to compose file:
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```yaml
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unoserver3:
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container_name: UNO-Server-3
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image: ghcr.io/unoconv/unoserver-docker:0.4.4
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# ... same config as unoserver1/2
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```
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2. Add environment variables to stirling-pdf service:
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```yaml
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PROCESS_EXECUTOR_UNO_SERVER_ENDPOINTS_2_HOST: "unoserver3"
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PROCESS_EXECUTOR_UNO_SERVER_ENDPOINTS_2_PORT: "2002"
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PROCESS_EXECUTOR_UNO_SERVER_ENDPOINTS_2_HOST_LOCATION: "remote"
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PROCESS_EXECUTOR_UNO_SERVER_ENDPOINTS_2_PROTOCOL: "http"
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PROCESS_EXECUTOR_SESSION_LIMIT_LIBRE_OFFICE_SESSION_LIMIT: "3" # Update!
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```
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3. Add to `depends_on`:
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```yaml
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depends_on:
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unoserver1:
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condition: service_healthy
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unoserver2:
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condition: service_healthy
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unoserver3:
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condition: service_healthy
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```
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### Scale with Docker Compose (Alternative)
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```bash
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docker compose -f docker-compose-latest-security-remote-uno.yml up -d --scale unoserver1=3
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```
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Note: This requires removing `container_name` and hardcoded ports.
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## Troubleshooting
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### "Connection refused" errors
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- **Cause**: `hostLocation: "auto"` or missing
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- **Fix**: Set `HOSTLOCATION: "remote"` for all endpoints
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### Conversions using only one server
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- **Cause**: Session limit too low or not matching endpoint count
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- **Fix**: Set `PROCESS_EXECUTOR_SESSION_LIMIT_LIBRE_OFFICE_SESSION_LIMIT` to match endpoint count
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### UNO server not starting
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- **Check**: `docker compose logs unoserver1`
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- **Common**: LibreOffice profile corruption
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- **Fix**: `docker compose down -v` (removes volumes)
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## Comparison: Local vs Remote UNO Servers
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### Local (Auto) Mode
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```yaml
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PROCESS_EXECUTOR_AUTO_UNO_SERVER: "true"
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PROCESS_EXECUTOR_SESSION_LIMIT_LIBRE_OFFICE_SESSION_LIMIT: "2"
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# Creates 2 servers on 127.0.0.1:2003, 127.0.0.1:2005 inside container (Stirling-PDF's own servers)
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```
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- ✅ Simpler configuration
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- ✅ Lower latency
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- ❌ All in one container (resource competition)
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- ❌ Can't scale independently
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### Remote Mode (This File)
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```yaml
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PROCESS_EXECUTOR_AUTO_UNO_SERVER: "false"
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# Define external endpoints with hostLocation: "remote"
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```
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- ✅ Resource isolation (separate containers)
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- ✅ Independent scaling
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- ✅ Better resilience (restart one without affecting others)
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- ❌ Slightly higher network overhead
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- ❌ More complex configuration
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## Advanced Configuration
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### HTTPS UNO Servers
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If your UNO servers use HTTPS (e.g., behind a reverse proxy):
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```yaml
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PROCESS_EXECUTOR_UNOSERVERENDPOINTS_0_PROTOCOL: "https"
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```
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### Custom Health Check Interval
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```yaml
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unoserver1:
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healthcheck:
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interval: 5s # Check more frequently
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timeout: 3s
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retries: 10
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start_period: 60s # Give more startup time
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```
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### Debug Mode
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To see detailed endpoint selection logs:
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```yaml
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environment:
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LOGGING_LEVEL_STIRLING_SOFTWARE_COMMON_UTIL_PROCESSEXECUTOR: DEBUG
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```
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## What This Demonstrates
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This configuration showcases all the improvements from the PR reviews:
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1. ✅ **Remote endpoint support** (`hostLocation: "remote"`)
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2. ✅ **BlockingQueue pool** (optimal endpoint distribution)
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3. ✅ **Idempotent lease close** (thread-safe)
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4. ✅ **Robust health checks** (unoping → TCP → PID fallbacks)
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5. ✅ **Proper validation** (hostLocation/protocol normalized)
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6. ✅ **Session limit warnings** (logs mismatch if misconfigured)
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## Performance Expectations
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With 2 UNO servers, you can expect:
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- **2x concurrent conversions** vs single server
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- **~50% reduction in queue wait time** under load
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- **Better resilience**: One server failure = 50% capacity, not 0%
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Tested with 100GB+ PDFs - BlockingQueue ensures no endpoint starvation.
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