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Requirements & Capacity

functional requirements non-functional requirements traffic estimation storage estimation bandwidth estimation latency budget availability target read/write ratio

Scaling & Distribution

vertical scaling horizontal scaling load balancing consistent hashing stateless services service discovery partitioning/sharding replication

Caching & Data

cache-aside write-through cache write-back cache cache invalidation database indexing read replicas CQRS event sourcing

Messaging & Async

message queue publish-subscribe dead-letter queue retry with backoff idempotent consumer outbox pattern stream processing saga orchestration

Reliability

health checks circuit breaker bulkhead isolation timeouts rate limiting graceful degradation multi-region failover disaster recovery RPO/RTO

Interfaces & Observability

API gateway service-to-service authentication distributed tracing structured logging metrics and SLOs correlation IDs backpressure schema evolution

System Design / Interfaces & Observability

correlation IDs

Learn correlation IDs in System Design with a dedicated explanation, a concept-specific example, practical cautions, and a mastery check.

12 min read • Advanced

system-design-046.yaml

yaml

request_headers:
  X-Request-ID: req-4d9c
propagate_to:
  - downstream_http_headers
  - structured_logs
  - async_message_metadata

What to watch

Content source & attribution

Original Syntaxis Content · Original Syntaxis Content

Lesson quizzes

correlation IDs Mastery Check →

metrics and SLOs