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Lessons (9)

• Time, Consistency and Distributed Transactions

  Reason about clocks, ordering, split brain, locks, CRDTs and transactions without promising impossible global certainty. ![Distributed correctness: clocks …

• ACID, Transactions & Locks

  … without a distributed lock. Locks, deadlocks and good habits Locks protect conflicting work, but long transactions hold them …

• Monolith vs Microservices

  … debug ❌ Distributed system complexity Calls between parts ✅ Fast, in-memory function calls ❌ Slow, unreliable network calls Transactions ✅ One …

• Data in Microservices: Sagas & the Outbox Pattern

  … We need other tools. Why not a distributed transaction (2PC)? Two-phase commit asks every participant "can you …

• SQL Language, Identifiers & Data Types

  … Many systems call COMMIT and ROLLBACK transaction-control statements. Q7: Identity, sequence and UUID An identity/auto-increment …

• SQL vs NoSQL Databases

  … when the network between servers breaks (a P artition), a distributed database must choose between: - C onsistency: refuse …

• Kafka vs RabbitMQ & the Kafka Ecosystem

  … side RabbitMQ Kafka --- --- --- Model Message broker with queues Distributed commit log After consumption Message is removed Message is …

• Message Queues & RabbitMQ

  … properties.messageId)) return channel.ack(msg); await db.transaction(async (tx) = { await doTheWork(tx, job); await tx.processedMessages …

• Event-Driven Architecture

  … when saving + publishing Transactional outbox pattern Hard to debug "what happened?" Correlation IDs, distributed tracing, an event catalog …