GraphQL is a query language to retrieve data from a server. It is an alternative to REST, SOAP, or gRPC in some way.

GraphQL is a new API standard and offers a revolutionary approach to building data-driven applications. The project was first created by Facebook while they were shifting their mobile app from HTML5 to a native mobile app.

GraphQL follows the same set of constraints as REST APIs, but it organizes data into a graph using one interface. Objects are represented by nodes (defined using the GraphQL schema), and the relationship between nodes is represented by edges in the…

Microservices is an architectural design for building a distributed application using containers. Microservices get their name because each function of the application operates as an independent service. This architecture allows for each service to scale or update without disrupting other services in the application.

In this article, I will explain and implement bellow points

1. What are microservice and their importance?
2. Comparison between monolithic architecture and microservice architecture
3. How Netflix stack (Eureka, ZUUL, Ribbon, etc) are the life saviour in our case?
4. Details level descriptions of Netflix technology stack
5. Describe and implement our proposed microservice architecture (service discovery, API gateway routing…

Today we will cover bellow things

1. The importance of docker
2. Overview on docker
3. Dockerizing spring app with detailed explanations
4. Docker various operations eg: Image creation and deletion, container creation and deletion and so more
5. Monitor Docker images using command line and docker desktop apps
6. Advance part: Automotion of docker task eg: docker build, run and push to docker hub from Gradle command

Prerequisites: Before starting this article you must have knowledge of spring boot with Gradle dependencies. You can learn this from the below link

1. The importance of docker

• is a tool designed to make it easier to create, deploy…

In current days I worked on Redis lock-in distributed system. In distributed system Locking/concurrency management is a very important thing. Without prior knowledge, many unwanted problems may occur.

What we will learn here

1. Create a simple wallet backend with buggy architecture and code
2. Create the Race condition and identify the problem
3. Solve the problem using new architecture and implementation
4. Share the codebase with file descriptions

Here I am sharing an application architecture. Suppose this is a bank wallet application backend. Its architecture is very simple. It has a single app server, single app node, single Redis server, and a single database

More often during API design, each API may server respond after querying data from a database or from external API calling. Sometimes there are some tables those data are not frequently changed, which means those tables are not transactional.

Database query or external API calls are very much expensive. In this case, we may cache those data into faster storage and server our client from that storage instead of fetch from there.

To achieve this goal, Redis has come. It not only caches data but also persistent with the database periodically and also it works in the distributed system.

Redis…

From the beginning of the year 2020, more people than ever before began working from home, and quite suddenly. Organizations and individuals didn’t get enough time to prepare for remote work or think about the best ways to smooth transition teams, processes, and culture to an online-only environment.

Working from home strategies has both positive and negative impact. It is found that working from home might make employees happier as it lowers stress and boosts morale, which drives employee efficiency and increases the production rate.
There’s no one-size-fits-all formula for remote work. Everyone has different ways of working. Different times at…

A database may contain one or more tables, functions, and it has a unique name. Each table is also identified by a name (e.g., “User,” “Product,” “Order”). Each table contains table relevant records with data.

SQL stands for Structured Query Language. The query language is one kind of programming language designed and developed to retrieve specific information from databases based on a query criterion, and that’s appropriately what SQL does. To put it simply, SQL is the language of databases.

SQL is database-specific, so that it may vary its syntax based on the database driver. …

During an API call from a client, the server creates and assigns a thread of that request. This thread waits and is appointed until requests are served to that client.
Each server can open a limited number of threads, and if that number exceeds, then new clients request will store in the request queue of that server.
For the Tomcat server, its default number of threads maxThreads is 200, representing the maximum number of concurrent threads allowed to run at any given time.
There are other metrics, maxConnections, representing the total number of concurrent connections that the server will accept and process. Any…