Category: Spring

Posted on: June 24, 2025 Posted by: rahulgite Comments: 0

Distributed Transaction Management – 2 & 3PC Interview Notes

What is a Transaction? A transaction is a logical unit of work that either completes entirely or fails completely. It follows the ACID properties to ensure data reliability in database systems. ACID Properties Monolithic vs. Microservices Transactions Monolithic Architecture Microservices Architecture Distributed Transaction Management In a microservices setup, a transaction might span across multiple independent services. There are two broad categories: 1. Synchronous Transaction Management 2. Asynchronous Transaction Management Two-Phase…

Posted on: June 24, 2025 Posted by: rahulgite Comments: 0

Microservices Interview Notes: Handling Failures, Tracing, and Data Consistency

1. Handling Partial Failures in Microservices The Problem In a distributed microservices architecture, services are independently deployed and communicate over the network. Due to this, partial failures become common. One service may be operational, while another it depends on may be down. Unlike monolithic applications where a single database transaction can be rolled back completely, microservices require more sophisticated strategies to maintain data integrity across service boundaries. The Solution: Saga…

Posted on: June 24, 2025 Posted by: rahulgite Comments: 0

Microservices Interview Notes: Scenario-Based Breakdown & Best Practices

1. Challenges Faced While Migrating to or Implementing Microservices Architecture a. Network Complexity and Latency b. Distributed Transaction Management c. Monitoring and Debugging d. Operational Complexity 2. Importance of Containerization and Microservices a. Addressing Diverse Technology Stacks b. Resource Isolation c. Scalability d. Development Velocity e. Technology Diversity 3. Logging and Monitoring in Microservices a. Centralized Logging b. Alerting 4. Implementing Data Consistency Across Microservices a. Saga Pattern b. Eventual…

Posted on: June 24, 2025 Posted by: rahulgite Comments: 0

Microservices Scenario-Based Interview Notes

Scenario 1: Service Communication and Data Consistency Problem: When multiple microservices (e.g., A → B → C) interact synchronously, and one service (e.g., B) fails, it may lead to cascading failures and inconsistent state. Solutions: Tool Summary: Scenario 2: Distributed Transactions and Consistency Problem: In a distributed system (e.g., e-commerce), ensuring atomicity of operations like placing an order, processing payment, and updating inventory is difficult. Solutions: Final Solution Summary: Scenario…

Posted on: June 24, 2025 Posted by: rahulgite Comments: 0

Micrometer in Spring Boot 3 – Detailed Interview Notes

✅ Introduction to Micrometer in Spring Boot 3 Micrometer is a metrics and observability library integrated into Spring Boot 3. It helps collect, expose, and export application signals such as: It provides a vendor-neutral API, allowing integration with tools like Prometheus, Datadog, New Relic, Zipkin, and more. 🧱 Three Core Pillars of Observability 1. 📊 Metrics 2. 📍 Tracing 3. 📄 Logs 🍽️ Metrics with Restaurant Analogy Metric Type Restaurant…

Posted on: April 21, 2025 Posted by: rahulgite Comments: 0

REST Interview Question

How can we implement a REST endpoint using a GET request to filter Employee entities based on any of their fields, considering the Employee class may have 100+ attributes, making individual @RequestParams impractical? Answer: To support dynamic filtering via a GET request without listing all 100+ fields as @RequestParam, we can use a single JSON-based query parameter (e.g., filter) and deserialize it into a filter object on the backend. This…

Posted on: March 8, 2025 Posted by: rahulgite Comments: 0

API Gateway, Service Discovery, Circuit Breaker , and Load Balancer in Microservices

Microservices architecture requires efficient communication and traffic management. API Gateways, Service Discovery, and Load Balancers play key roles in managing traffic, ensuring scalability, and maintaining service availability. 1. API Gateway What is an API Gateway? An API Gateway acts as a single entry point for client requests, managing authentication, routing, load balancing, caching, and monitoring. It simplifies microservices communication by providing a unified interface for multiple services. Features of API…

Posted on: March 8, 2025 Posted by: rahulgite Comments: 0

Ways to Communicate Between Microservices

Microservices communicate using different mechanisms based on their architecture and use cases. Below are the primary communication patterns: 1. Synchronous Communication a. REST APIs (HTTP Communication) Pros: Simple, widely used, language-independent. Cons: Tight coupling, request/response delay, network overhead. b. Feign Client (Declarative REST Communication) Pros: Reduces boilerplate, built-in load balancing (with Spring Cloud LoadBalancer), integrates well with Spring Boot. Cons: Requires service discovery, introduces additional dependencies. c. HTTP Client (Spring…

Posted on: March 4, 2025 Posted by: rahulgite Comments: 0

Microservices Architecture with Spring Boot 3

1. Overview This document provides an overview of a Microservices Architecture implemented with Spring Boot 3. The architecture includes key components such as API Gateway, Load Balancer, Service Discovery, Databases, Message Broker, Caching, Monitoring, and Logging. 2. Architecture Diagram Below is a high-level architecture diagram representing the microservices setup: 2.1 Diagram: Flow Between API Gateway, Load Balancer, and Service Discovery [Client] → [API Gateway] → [Load Balancer] → [Service Discovery]…

Posted on: February 8, 2025 Posted by: rahulgite Comments: 1

Spring Autowiring

1. What is Autowiring in Spring? Autowiring in Spring is the process of automatically injecting dependent beans into a Spring-managed component. It helps in reducing manual bean configuration in the Spring application. 2. Types of Dependency Injection (DI) in Spring Spring supports three primary types of dependency injection: 3. Autowiring in Spring Framework Spring provides the following ways to autowire dependencies: 3.1 Using @Autowired (Most Common Approach) The @Autowired annotation…