Compare Microservices Architecture with Monolithic Architecture: Trade-offs, Scalability, and Distributed Challenges.
Quick Revision Summary
Monoliths offer simplicity and strict ACID transactions at early stages; microservices deliver fault isolation and independent scalability at the expense of distributed complexity.
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Model Answer & Deep-Dive Explanation
Monolithic Architecture: The entire software application is built as a single, unified deployable unit sharing a single codebase and database.
- Pros: Simple development, straightforward end-to-end testing, zero network serialization latency, easy transactional consistency (ACID).
- Cons: High blast radius (one unhandled exception can crash the entire server), tight coupling, slow deployments, difficulty in scaling independent modules.
Microservices Architecture: The system is decomposed into small, autonomous, loosely coupled services organized around business capabilities, communicating over network protocols (gRPC, REST, Kafka).
- Pros: Independent deployability, fault isolation, heterogeneous tech stacks per domain, targeted horizontal auto-scaling.
- Cons: Distributed transaction complexity (requires Saga patte / eventual consistency), network latency and partial failure handling, distributed tracing and observability overhead.
Interviewer Evaluation Points & Scoring Rubric
- 1 1. Explains core trade-offs rather than dogmatic choices. 2. Addresses distributed data management (Saga pattern, eventual consistency). 3. Mentions network failure and observability requirements.
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