Load Balancing &
Task Delegation Logic
Intelligent distribution of work across nodes — keeping systems healthy, fast, and fault-tolerant at every scale.
Balancing Algorithms
Click any algorithm to activate it in the simulator above.
What Is Load Balancing?
Load balancing distributes incoming network traffic or computational tasks across multiple backend resources — servers, containers, or worker processes — to prevent any single node from becoming a bottleneck. The result is higher availability, lower latency, and elastic scalability.
- Prevents single points of failure
- Enables horizontal scaling on demand
- Improves throughput and response times
- Supports rolling updates with zero downtime
Task Delegation Logic
Task delegation governs how work is handed off from an orchestrator to workers. Good delegation logic considers worker capability, current load, task priority, and expected completion time before assignment.
- Priority queues — high-priority tasks preempt lower ones
- Affinity rules — pin tasks to capable workers
- Deadline scheduling — meet SLA time constraints
- Work stealing — idle workers pull from busy queues
Task Delegation Decision Matrix
| Scenario | Strategy | Rationale | Status |
|---|---|---|---|
| Uniform stateless requests | Round Robin | Even distribution, zero state required | Optimal |
| Long-running jobs | Least Connections | Avoids overloading slow finishers | Optimal |
| Mixed-capacity nodes | Weighted RR | Respects hardware asymmetry | Optimal |
| Session-dependent users | IP Hash / Sticky | Preserves session data locality | Context-dep. |
| CPU-intensive batch | Capacity-aware | Match task weight to worker capacity | Optimal |
| Node failure detected | Health-check bypass | Route around unhealthy nodes instantly | Failover |
| Traffic spike / burst | Auto-scale + RR | Provision new nodes & rebalance | Scaling |
Transport-Level Balancing
Operates at TCP/UDP level. Routes based on IP address and port without inspecting packet contents. Extremely fast with minimal overhead — ideal for raw throughput.
Application-Level Balancing
Reads HTTP headers, cookies, and URLs to make smarter routing decisions. Enables A/B testing, canary releases, and path-based routing. More powerful, slightly heavier.
Geo-DNS Balancing
Routes users to the nearest data center using DNS resolution at the geographic level. Reduces round-trip time globally and improves disaster recovery across regions.
Health Check & Circuit Breaker Patterns
Healthy load balancing requires continuous observation of every node. When a server degrades, traffic must be rerouted before users notice.
🩺 Health Check Types
- TCP probe — can we open a connection?
- HTTP probe — does /health return 200?
- Custom script — domain-specific sanity checks
- gRPC probe — checks service readiness state
⚡ Circuit Breaker States
- Closed — normal operation, requests flow through
- Open — failure threshold hit, requests blocked
- Half-open — test probe sent, recovery evaluated
- Reset — back to closed after successful probe
