Apache Kafka / Intermediate: contracts, failures and observability

Apache Kafka β€” Intermediate: contracts, failures and observability

Connect schema changes, retries, replication and external effects to diagnostic evidence.

6 lessons Β· No account required

What you will learn

  • Design duplicate-safe retries and versioned payloads.
  • Diagnose ISR, outbox handoffs and consumer lag.

  1. Serialization and schema evolution

    Keep byte-level encoding, event meaning and reader compatibility in one reviewed contract.

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  2. Idempotence, retries and event identity

    Separate producer retry protection from application duplicate handling and uncertain business outcomes.

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  3. Replication, ISR and write availability

    Evaluate acknowledged writes against replica health and make durability-availability tradeoffs explicit.

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  4. Poison records and retry topics

    Classify record failures, preserve diagnostic evidence and review how retry routing changes ordering.

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  5. External effects and the outbox pattern

    Analyze dual writes and place durable handoff evidence inside the authoritative transaction.

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  6. Lag, throughput and operational evidence

    Interpret consumer lag alongside rates, partition skew and business freshness.

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