What is Event-Driven Architecture (EDA)? In Event-Driven Architecture, services: Produce events when something happens Consume events asynchronously Do not wait for each other 👉 Services are loosely coupled. 📌 Example…
Why Distributed Transactions Are a Problem? In microservices: Each service has its own database Traditional 2PC (XA transactions) don’t scale well High latency & tight coupling 👉 So we use…
Authentication vs Authorization Authentication → Who are you? (identity) Authorization → What can you access? (permissions) 🔹 Challenge in Microservices Multiple services Stateless REST APIs Shared security logic Avoid session…
What is Service Discovery? In microservices, service instances: Scale up/down dynamically Change IPs frequently 👉 Service Discovery helps services find each other dynamically without hard-coded URLs. 🔹 Types of Service…
Problem Without Centralized Configuration In microservices: Each service has its own application.properties Environment changes (dev/qa/prod) require redeployment Configuration drift occurs Security risk (secrets in code) 🔹 What is Spring Cloud…
What is Load Balancing in Microservices? Load balancing means distributing incoming requests across multiple instances of a service to: Improve performance Increase availability Avoid overloading a single instance 📌 Example:Order…
What is Inter-service Communication? How one microservice talks to another to: Fetch data Trigger actions Share events There are two main approaches: Synchronous (REST/HTTP) Asynchronous (Messaging – Kafka/RabbitMQ) 🔹 1️⃣…
What is an API Gateway? An API Gateway is a single entry point for all client requests in a microservices architecture. Instead of clients calling multiple microservices directly, they call…
Step 1: Understand the Business Requirement Before writing code, clarify: What problem does the service solve? What is its single responsibility? 👉 Example:“Order Service” → only handles order creation, update,…
What is Monolithic Architecture? A monolithic application is built as one single unit where: UI Business logic Database accessare all tightly coupled and deployed together. 📌 Example:One WAR/JAR contains user…
