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Module 11

💬

Messaging & Communication Patterns

How services talk to each other: pub/sub, request-reply, message brokers, fan-out, and patterns for reliable asynchronous communication.

6 lessons~71 min

What you'll learn

  • •Design pub/sub topologies for event distribution
  • •Implement request-reply and async request-reply patterns
  • •Use message brokers as central communication hubs
  • •Apply fan-out/fan-in for parallel processing
  • •Handle message ordering with sequential convoy
1

Publish/Subscribe Pattern (Deep Dive)

Beyond the basics: topic design, subscription filtering, at-least-once vs exactly-once delivery, and scaling pub/sub systems.

12m
High
2

Message Broker Pattern

Central message routing: broker topologies, message persistence, delivery guarantees, and comparing brokers (Kafka, RabbitMQ, SQS, Pulsar).

15m
High
3

Request-Reply Pattern

Synchronous communication over messaging: correlation IDs, reply queues, timeouts, and when to use request-reply vs fire-and-forget.

10m
Medium
4

Async Request-Reply Pattern

Long-running operations over messaging: polling endpoints, webhooks, status callbacks, and the async HTTP pattern with 202 Accepted.

12m
High
5

Sequential Convoy Pattern

Process related messages in order: session-based routing, partition keys, ordered queues, and maintaining sequence without sacrificing throughput.

10m
Medium
6

Fan-Out / Fan-In Pattern

Distribute work to many workers (fan-out) and aggregate results (fan-in): scatter-gather, MapReduce-style processing, and aggregation strategies.

12m
High
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