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Lessons (7)

• Kafka Producers

  … fetch + replicate L-- P: ✅ ack (in-sync replicas have it) acks Producer waits for Speed Can lose data …

• Message Queues & RabbitMQ

  … ack ✅ (message deleted) else worker crashes 💥 before ack Q- Q: no ack received → re-queue 7 Q- W …

• Brokers, Replication & Durability

  … replicas Topic / broker 2 acks Producer all With these, a write is acknowledged only when at least 2 …

• How a Web Request Works

  … TCP handshake (SYN, SYN-ACK, ACK) B- LB: TLS handshake (certificate, keys) B- LB: GET /products/42 LB …

• Delivery Guarantees: At-Most, At-Least & Exactly Once

  … when the producer writes it, and when the consumer processes it. mermaid flowchart LR P[Producer] -- "① ack …

• Design a Chat Application

  … design-l6/chat.svg) Persist a message before acknowledging it, then publish a durable event for recipients. A …

• Kafka vs RabbitMQ & the Kafka Ecosystem

  … Per-message features Priorities, TTL, delays, per-message ack/nack Batches, offsets, compaction Multiple independent readers One queue …