# Parallel Deployment Comparison

## Deployment Modes

### 1. Sequential (Baseline)
- **Time**: 5-9 hours
- **Method**: One region at a time
- **Speedup**: 1x
- **Risk**: Low
- **Use Case**: Testing, debugging

### 2. Standard Parallel
- **Time**: 45-85 minutes
- **Method**: Terraform parallelism=50, phases sequential
- **Speedup**: 6-12x
- **Risk**: Low
- **Use Case**: Production deployment (balanced)

### 3. Maximum Parallel ⭐ RECOMMENDED
- **Time**: 30-60 minutes
- **Method**: Terraform parallelism=128, phases sequential but maximally parallel
- **Speedup**: 10-18x
- **Risk**: Medium
- **Use Case**: Fast production deployment
- **Script**: `./scripts/deployment/deploy-max-parallel.sh`

### 4. Ultra Parallel 🚀 FASTEST
- **Time**: 20-40 minutes
- **Method**: All phases simultaneously, Terraform parallelism=128
- **Speedup**: 15-27x
- **Risk**: High
- **Use Case**: Fastest possible deployment (monitor closely)
- **Script**: `./scripts/deployment/deploy-ultra-parallel.sh`

## Performance Breakdown

| Phase | Sequential | Standard | Maximum | Ultra |
|-------|-----------|----------|---------|-------|
| Infrastructure | 2-4 hours | 30-60 min | 20-30 min | 20-30 min |
| Kubernetes | 1-2 hours | 5-10 min | 3-5 min | 3-5 min |
| Besu Network | 2-3 hours | 10-15 min | 5-10 min | 5-10 min |
| Contracts | 1-2 hours | 1-2 hours | 1-2 hours | 1-2 hours |
| Monitoring | 30-60 min | 5-10 min | 3-5 min | 3-5 min |
| **Total** | **5-9 hours** | **45-85 min** | **30-60 min** | **20-40 min** |

## Parallelism Details

### Terraform
- **Default**: 10 operations
- **Standard**: 50 operations (5x)
- **Maximum**: 128 operations (12.8x)
- **Impact**: Infrastructure deployment speed

### Kubernetes
- **Standard**: xargs -P 24 (24 regions)
- **Maximum**: xargs -P 24 (24 regions)
- **Impact**: Configuration speed

### Besu
- **Standard**: xargs -P 24 (24 regions)
- **Maximum**: xargs -P 48 (48 validators)
- **Impact**: Network deployment speed

## Recommended Approach

### First Deployment
1. Use **Maximum Parallel** mode
2. Monitor for API rate limits
3. Verify successful deployment

### Subsequent Deployments
1. If Maximum Parallel works, try **Ultra Parallel**
2. Monitor closely for issues
3. Adjust parallelism if hitting limits

## Risk Mitigation

### API Rate Limits
- **Symptom**: "Too Many Requests" errors
- **Solution**: Reduce parallelism to 64 or 32
- **Command**: `terraform apply -parallelism=64`

### Partial Failures
- **Symptom**: Some regions succeed, others fail
- **Solution**: Retry failed regions independently
- **Command**: `terraform apply -target=module.region_deployment["region"]`

### Monitoring
- Watch Terraform output
- Monitor Azure Portal
- Check deployment logs
- Verify resource creation

## Quick Reference

```bash
# Maximum Parallel (Recommended)
./scripts/deployment/deploy-max-parallel.sh

# Ultra Parallel (Fastest)
./scripts/deployment/deploy-ultra-parallel.sh

# Standard Parallel (Safest)
./scripts/deployment/deploy-parallel.sh
```
