Kafka

Choose a partition key for an event stream

Explains partition key selection for ordering, load distribution, hot keys, and consumer scalability.

Design a message envelope with correlation metadata

Explains useful message metadata for tracing, idempotency, ownership, versioning, and support diagnostics.

Design for broker outage and backpressure

Explains how systems behave when the broker is down or slow and how backpressure protects callers and dependencies.

Design safe event replay and backfill

Explains how to reprocess event streams safely for new projections, bug fixes, and data repair.

Distinguish commands and events in message-driven systems

Explains command messages versus event messages and how ownership changes their design.

Explain consumer groups and offset commits

Explains how consumer groups share event-stream work and how offset commits affect duplicate or lost processing.

Message Queues & Events

Queues, events, idempotency, retries, dead letters, ordering, and streaming.

A practical messaging track covering queue-backed workers, publish-subscribe events, retry behavior, idempotent consumers, dead-letter recovery, message ordering, event schemas, consumer lag, replay, and production operations.