Search

Lessons (10)

• Message Delivery: Queues, Kafka, Ordering and DLQs

  … Measure consumer lag, oldest failed event and duplicate side effects; a DLQ is pending repair, not successful processing …

• Message Queues & RabbitMQ

  … The DLQ stops it from blocking the queue forever. Delivery guarantees Guarantee Meaning How --- --- --- At most once May …

• Event-Driven Patterns, Step Functions and Reliable Lambdas

  … publish once, and each team has its own queue and DLQ. mermaid flowchart LR O[Order service] -- T …

• AWS Messaging: Queues, Topics and Events

  … Configure a dead-letter queue (DLQ) and a redrive policy with a reasonable maximum receive count. For example …

• Concurrency, Resilience & Distributed Workflows

  … B[Backoff + jitter] B -- C[Circuit breaker] C -- DLQ[Dead-letter queue / operator review] Race conditions and deadlocks …

• Batch vs Stream and Data Modeling

  … Streams need an ordering key, idempotency, retention and DLQ. Batch jobs need isolation so reporting cannot starve checkout …

• Design a Reliable Notification System

  … Retry transient errors with backoff; move poison work to a DLQ for investigation. Watch oldest-job age, provider …

• Real-Time, Pub/Sub, Webhooks and CDC

  … consumers deduplicate and send exhausted failures to a DLQ. A reliable order event In the same transaction that …

• Timeouts, Retries & Backpressure

  … before checkout. - Route poison jobs to a visible DLQ. Watch: queue age, saturation, rejected work, dependency latency, retries …

• Backend Design Scenarios

  … Provider adapters] G -- R[Retry queues] R -- D[DLQ + operator replay] Store the campaign and recipient snapshot once …