This burst scaling system enables Ruvector to handle massive traffic spikes (e.g., World Cup events with 25 billion concurrent streams) while maintaining strict latency SLAs and cost controls.

Key Features

Predictive Scaling: ML-based forecasting pre-warms capacity before known events
Reactive Scaling: Real-time auto-scaling based on CPU, memory, connections, and latency
Global Orchestration: Cross-region capacity allocation with budget controls
Cost Management: Sophisticated budget tracking with graceful degradation
Infrastructure as Code: Complete Terraform configuration for GCP Cloud Run
Comprehensive Monitoring: Cloud Monitoring dashboard with 15+ key metrics

Capabilities

Metric	Baseline	Burst Capacity	Target
Concurrent Streams	500M	25B (50x)	<50ms p99
Scale-Out Time	N/A	<60 seconds	Full capacity
Regions	3	8+	Global coverage
Cost Control	$240k/day	$5M/month	Budget-aware
Instances per Region	10-50	1000+	Auto-scaling

Architecture

┌─────────────────────────────────────────────────────────────────┐
│                      Global Load Balancer                        │
│                    (CDN + SSL + Health Checks)                   │
└───────────────────┬──────────────┬──────────────┬───────────────┘
                    │              │              │
        ┌───────────▼──────┐  ┌────▼─────────┐  ┌▼──────────────┐
        │  us-central1     │  │ europe-west1 │  │  asia-east1   │
        │  Cloud Run       │  │  Cloud Run   │  │  Cloud Run    │
        │  10-1000 inst    │  │  10-1000 inst│  │  10-1000 inst │
        └───────────┬──────┘  └────┬─────────┘  └┬──────────────┘
                    │              │              │
        ┌───────────▼──────────────▼──────────────▼──────────────┐
        │            Capacity Manager (Orchestration)             │
        │  ┌────────────────┐  ┌──────────────────────────────┐ │
        │  │ Burst Predictor│  │    Reactive Scaler           │ │
        │  │ - Event cal    │  │    - Real-time metrics       │ │
        │  │ - ML forecast  │  │    - Dynamic thresholds      │ │
        │  │ - Pre-warming  │  │    - Rapid scale-out         │ │
        │  └────────────────┘  └──────────────────────────────┘ │
        └─────────────────────────────────────────────────────────┘
                    │              │              │
        ┌───────────▼──────┐  ┌────▼─────────┐  ┌▼──────────────┐
        │  Cloud SQL       │  │  Redis       │  │  Monitoring   │
        │  + Read Replicas │  │  64GB HA     │  │  Dashboards   │
        └──────────────────┘  └──────────────┘  └───────────────┘

Quick Start

Prerequisites

Node.js 18+
Terraform 1.0+
GCP Project with billing enabled
GCP CLI (gcloud) authenticated

Installation

cd /home/user/ruvector/src/burst-scaling

# Install dependencies
npm install

# Configure GCP
gcloud config set project YOUR_PROJECT_ID

# Initialize Terraform
cd terraform
terraform init

# Create terraform.tfvars (see variables.tf for all options)
cat > terraform.tfvars <<EOF
project_id      = "ruvector-prod"
billing_account = "0123AB-CDEF45-67890"
domain          = "api.ruvector.io"
alert_email     = "ops@ruvector.io"

regions = [
  "us-central1",
  "europe-west1",
  "asia-east1"
]

# Scaling configuration
min_instances        = 10
max_instances        = 1000
burst_multiplier_max = 50

# Budget
hourly_budget  = 10000
daily_budget   = 200000
monthly_budget = 5000000

# Thresholds
cpu_scale_out_threshold = 0.70
latency_threshold_ms    = 50
EOF

Deploy Infrastructure

# Plan deployment
terraform plan -var-file="terraform.tfvars"

# Deploy (creates all infrastructure)
terraform apply -var-file="terraform.tfvars"

# Outputs will show:
# - Load balancer IP address
# - Cloud Run service URLs
# - Database connection strings
# - Redis instance hosts

Configure Monitoring

# Import dashboard to Cloud Monitoring
gcloud monitoring dashboards create \
  --config-from-file=../monitoring-dashboard.json

# Set up alerting (already configured via Terraform)
# Alerts will be sent to: ops@ruvector.io

Run Scaling Components

# Start Burst Predictor (loads event calendar)
npm run predictor

# Start Reactive Scaler (monitors real-time metrics)
npm run scaler

# Start Capacity Manager (orchestrates everything)
npm run manager

# For production, run as systemd services or Cloud Run jobs

Usage

Predictive Scaling

import { BurstPredictor, EventCalendar } from './burst-predictor';

const predictor = new BurstPredictor();

// Load event calendar
const calendar: EventCalendar = {
  events: [
    {
      id: 'world-cup-final',
      name: 'World Cup Final 2026',
      type: 'sports',
      startTime: new Date('2026-07-19T15:00:00Z'),
      region: ['us-central1', 'europe-west1', 'south-america-east1'],
      expectedViewers: 2_000_000_000
    }
  ]
};

await predictor.loadEventCalendar(calendar);

// Get predictions for next 24 hours
const bursts = await predictor.predictUpcomingBursts(24);
console.log(`Predicted ${bursts.length} burst events`);

// Get pre-warming schedule
const schedule = await predictor.getPreWarmingSchedule();

Reactive Scaling

import { ReactiveScaler, ScalingMetrics } from './reactive-scaler';

const scaler = new ReactiveScaler();

// Update thresholds
scaler.updateThresholds({
  cpuScaleOut: 0.70,
  cpuScaleIn: 0.30,
  maxP99Latency: 50
});

// Process metrics (called continuously)
const metrics: ScalingMetrics = {
  region: 'us-central1',
  timestamp: new Date(),
  cpuUtilization: 0.75,
  memoryUtilization: 0.68,
  activeConnections: 45_000_000,
  requestRate: 150_000,
  errorRate: 0.005,
  p99Latency: 42,
  currentInstances: 50
};

const action = await scaler.processMetrics(metrics);
if (action.action !== 'none') {
  console.log(`Scaling ${action.region}: ${action.fromInstances} -> ${action.toInstances}`);
}

Capacity Management

import { CapacityManager } from './capacity-manager';

const manager = new CapacityManager();

// Update budget
manager.updateBudget({
  hourlyBudget: 12000,
  warningThreshold: 0.85
});

// Run orchestration (call every 60 seconds)
const plan = await manager.orchestrate();
console.log(`Total instances: ${plan.totalInstances}`);
console.log(`Total cost: $${plan.totalCost}/hour`);
console.log(`Degradation level: ${plan.degradationLevel}`);

Configuration

Scaling Thresholds

Edit terraform/variables.tf:

# CPU thresholds
cpu_scale_out_threshold = 0.70  # Scale out at 70% CPU
cpu_scale_in_threshold  = 0.30  # Scale in at 30% CPU

# Memory thresholds
memory_scale_out_threshold = 0.75
memory_scale_in_threshold  = 0.35

# Latency
latency_threshold_ms = 50  # p99 latency SLA

# Connections
max_connections_per_instance = 500000

Budget Controls

# Budget limits
hourly_budget   = 10000   # $10k/hour
daily_budget    = 200000  # $200k/day
monthly_budget  = 5000000 # $5M/month

# Enforcement
hard_budget_limit = false  # Allow temporary overages during bursts
budget_warning_threshold = 0.80  # Warn at 80%

Region Configuration

regions = [
  "us-central1",      # Primary
  "europe-west1",     # Europe
  "asia-east1",       # Asia
  "us-east1",         # Additional US
  "asia-southeast1"   # SEA
]

# Region priorities (1-10, higher = more important)
region_priorities = {
  "us-central1"  = 10
  "europe-west1" = 9
  "asia-east1"   = 8
}

# Region costs ($/hour per instance)
region_costs = {
  "us-central1"  = 0.50
  "europe-west1" = 0.55
  "asia-east1"   = 0.60
}

Monitoring

Cloud Monitoring Dashboard

Access at: https://console.cloud.google.com/monitoring/dashboards/custom/ruvector-burst

Key Metrics:

Total connections across all regions
Connections by region (stacked area)
P50/P95/P99 latency percentiles
Instance count by region
CPU & memory utilization
Error rates
Hourly & daily cost estimates
Burst event timeline

Alerts

Configured alerts (sent to alert_email):

Alert	Threshold	Action
High Latency	p99 > 50ms for 2min	Investigate
Critical Latency	p99 > 100ms for 1min	Page on-call
High Error Rate	>1% for 5min	Investigate
Budget Warning	>80% hourly	Review costs
Budget Critical	>100% hourly	Enable degradation
Region Down	0 healthy backends	Page on-call

Log Queries

# View scaling events
gcloud logging read 'jsonPayload.message =~ "SCALING"' --limit=50

# View high latency requests
gcloud logging read 'jsonPayload.latency > 0.1' --limit=50

# View budget alerts
gcloud logging read 'jsonPayload.message =~ "BUDGET"' --limit=50

Operations

Daily Operations

See RUNBOOK.md for complete operational procedures.

Quick checks:

# Check system status
npm run manager

# View predictions
npm run predictor

# Check current metrics
gcloud run services list --platform=managed

# Review costs
gcloud billing accounts list

Emergency Procedures

Latency spike (p99 > 100ms):

# Force scale-out all regions
for region in us-central1 europe-west1 asia-east1; do
  gcloud run services update ruvector-$region \
    --region=$region \
    --max-instances=1500
done

Budget exceeded:

# Enable minor degradation (shed free tier)
npm run manager -- --degrade=minor

# Enable major degradation (free tier only, limited features)
npm run manager -- --degrade=major

Region failure:

# Scale up remaining regions
gcloud run services update ruvector-europe-west1 \
  --region=europe-west1 \
  --max-instances=2000

# Activate backup region
terraform apply -var='regions=["us-central1","europe-west1","asia-east1","us-east1"]'

Cost Analysis

Expected Costs

Scenario	Instances	Hourly	Daily	Monthly
Baseline	30 (10/region)	$45	$1,080	$32,400
Normal Load	150 (50/region)	$225	$5,400	$162,000
Medium Burst (10x)	600 (200/region)	$900	$21,600	$648,000
Major Burst (25x)	1,500 (500/region)	$2,250	$54,000	$1,620,000
World Cup (50x)	3,000 (1000/region)	$4,500	$108,000	$3,240,000

Cost Breakdown:

Cloud Run instances: $0.50/hour per instance (varies by region)
Cloud SQL: $500/month per region
Redis: $300/month per region
Load Balancer: $18/month + $0.008/GB
Networking: ~$0.12/GB egress

Cost Optimization

Auto-scale down: Gradual scale-in after bursts (5-10 minutes)
Regional pricing: Prioritize cheaper regions (us-central1 < europe-west1 < asia-east1)
CDN caching: Reduce backend load by 40-60%
Connection pooling: Reduce database costs
Budget controls: Automatic degradation at thresholds

Testing

Load Testing

# Install dependencies
npm install -g artillery

# Run load test
artillery run load-test.yaml

# Expected results:
# - Handle 10x burst: 5B connections
# - Maintain p99 < 50ms
# - Auto-scale to required capacity

Burst Simulation

# Simulate World Cup event
npm run predictor -- --simulate --event-type=world-cup-final

# Monitor dashboard during simulation
# Verify pre-warming occurs 15 minutes before
# Verify scaling to 1000 instances per region
# Verify p99 latency stays < 50ms

Cost Testing

# Simulate costs for different scenarios
npm run manager -- --simulate --multiplier=10  # 10x burst
npm run manager -- --simulate --multiplier=25  # 25x burst
npm run manager -- --simulate --multiplier=50  # 50x burst

# Review estimated costs
# Verify budget controls trigger at thresholds

Troubleshooting

Issue: Auto-scaling not working

Check:

# Verify Cloud Run auto-scaling config
gcloud run services describe ruvector-us-central1 --region=us-central1

# Check quotas
gcloud compute project-info describe --project=ruvector-prod

# Check IAM permissions
gcloud projects get-iam-policy ruvector-prod

Issue: High latency during burst

Check:

Database connection pool exhaustion
Redis cache hit rate
Network bandwidth limits
CPU/memory saturation

Fix:

# Scale up database
gcloud sql instances patch ruvector-db-us-central1 --cpu=32 --memory=128GB

# Scale up Redis
gcloud redis instances update ruvector-redis-us-central1 --size=128

# Force scale-out
gcloud run services update ruvector-us-central1 --max-instances=2000

Issue: Budget exceeded unexpectedly

Check:

# Review cost breakdown
gcloud billing accounts list

# Check instance counts
gcloud run services list

# Review recent scaling events
gcloud logging read 'jsonPayload.message =~ "SCALING"' --limit=100

Fix:

Enable hard budget limit
Adjust scale-in cooldown (faster scale-down)
Review regional priorities
Enable aggressive degradation

Development

Build

npm run build

Test

npm test

Lint

npm run lint

Watch Mode

npm run watch

Files

burst-scaling/
├── burst-predictor.ts          # Predictive scaling engine
├── reactive-scaler.ts          # Reactive auto-scaling
├── capacity-manager.ts         # Global orchestration
├── monitoring-dashboard.json   # Cloud Monitoring dashboard
├── package.json                # Dependencies
├── tsconfig.json              # TypeScript config
├── README.md                   # This file
├── RUNBOOK.md                  # Operations runbook
└── terraform/
    ├── main.tf                 # Infrastructure as Code
    └── variables.tf            # Configuration parameters

Support

Documentation: This README and RUNBOOK.md
Issues: https://github.com/ruvnet/ruvector/issues
Slack: #burst-scaling
On-call: Check PagerDuty rotation

License

MIT License - See LICENSE file in repository root

Author: Ruvector DevOps Team Last Updated: 2025-01-20 Version: 1.0.0