Microservice Architectures - Challenges with building Microservices


Microservices architectures are very popular today. In this article, we discuss the important challenges in developing a microservices architecture.

  • Identifying Microservice Boundaries - Implementing Bounded Context
  • Having Proper Configuration Management
  • Implementing Technology for Dynamic Scale Up And Scale Down
  • Ensuring High Visibility
  • Ensuring High Fault Tolerance

Free Courses - Learn in 10 Steps

Introduction to Cloud, Microservice - Challenges and Advantages

This is the fourth article in a series of five articles on cloud and microservices:

Identifying Microservice Boundaries - Implementing Bounded Context

We are aware that in a microservices architecture, instead of single big monolith application, we build a number of independent microservices talking with each other:

image info

An important question one faces while designing such a system is, how do we define the boundaries of individual microservices?

How do you decide what one service does, and what it should not do?

This is particularly difficult for a new application, as there may not be enough business knowledge to establish the right boundaries.

The task of deciding the boundaries of microservices is an evolving process. It is not something you necessarily get right the first time.

It often involves using domain driven design while playing around the functionality of the microservices. As you gain design knowledge, you need to put that knowledge back into the microservices architecture.

The best practices include following domain driven design.

Having Proper Configuration Management

Configuration management poses quite a stiff challenge in implementing microservices.

Suppose that in our system, we have a few microservices, each of which has multiple instances in each environment: image info

In a slightly larger system, there could be 10 microservices with 5 environments, and 50 instances at the least. We are talking about tons of configuration here!

This will involve a lot of work for the operations team, just to maintain all these configuration.

Typically, centralized configuration helps you manage configuration.

Implementing Technology for Dynamic Scale Up And Scale Down

For a microservices architecture, establishing the technology to do dynamic scaling of infrastructure, is a mountain to scale in itself.

The loads on different microservices could be different, at different instances of time: image info

At a particular point of time, you may need 2 instances of Microservice2. However at a later point in time, that need may go up to 4. Again, it could shoot up to 10 later. In essence, we need to bring up new instances of a microservices when they are in demand, and bring them down when no longer needed.

All this scaling needs to be done with dynamic load balancing. At the point of time shown in the diagram, the load from Microservice1 needs to be distributed among the 4 instances of Microservice2. Later, when there are 10 instances of Microservice2, there needs to be another load redistribution among those 10 instances.

Building an architecture for this involves a number of technical components - Naming Server, Load Balancers, Monitoring tools to identify whether to scale in or scale out.

Ensuring High Visibility

Ensuring visibility is one of the most important challenges that needs to be addressed.

image info

If we say that the functionality of the above system needs to be distributed among 10 microservices, but there is a bug, how do you identify where the bug is? There is clearly a need for a centralized log, where we need to find out what happened with a specific request.

We also need to have effective monitoring across the microservices.

Ensuring High Fault Tolerance

If not well designed, a microservices architecture can behave like a pack of cards. A microservice at the end of such a chain would be fundamental to the system behaving well.

Therefore, it is very important for you to have sufficient fault tolerance in place, in your system.

Do check out our video on the same topic:

image info


In this article, we looked at the various challenges that need to be addressed, while designing a microservices architecture. We covered areas such as bounded context, configuration management, dynamic scale up and scale down, visibility and fault tolerance.

Best Selling Udemy Courses

Image Image Image Image Image Image Image Image Image

Join 450,000 Learners and 30+ Amazing Courses

350,000 Learners are learning everyday with our Best Selling Courses : Spring Boot Microservices, Spring, Spring Boot, Web Services, Hibernate, Full Stack React, Full Stack Angular, Python, Spring Interview Guide, Java Interview, Java Functional Programming, AWS, Docker, Kubernetes, PCF, AWS Fargate and Azure

Do not know where to start your learning journey? Check out our amazing learning paths:
Learning Path 01 - Spring and Spring Boot Web Applications and API Developer,
Learning Path 02 - Full Stack Developer with Spring Boot, React & Angular,
Learning Path 03 - Cloud Microservices Developer with Docker and Kubernetes,
Learning Path 04 - Learn Cloud with Spring Boot, AWS, Azure and PCF and
Learning Path 05 - Learn AWS with Microservices, Docker and Kubernetes



Related Posts

Oauth2.0 - Resource Owner Password Credentials grant workflow

Let us understand the Oauth2.0 Resource Owner Password Credentials grant workflow

Oauth2.0 - Implicit grant workflow

Let us understand the Oauth2.0 implicit grant workflow

Oauth2.0 - Client Credentials grant workflow

Let us understand the Oauth2.0 client credentials grant workflow

Oauth2.0 - Authorization grant workflow

Let us understand the Oauth2.0 authorization grant workflow

Writing Integration Tests for Rest Services with Spring Boot

Setting up a basic REST Service with Spring Boot is a cake walk. We will go one step further and add great integration tests!

Integrating Spring Boot and Spring JDBC with H2 and Starter JDBC

Learn using Spring Boot Starter JDBC to connect Spring Boot to H2 (in memory database) using Spring JDBC. You will create a simple project with Spring Boot. You will add code to the project to connect to a database using Spring JDBC. You will learn to implement the basic CRUD methods.

JUnit Tutorial for Beginners in 5 Steps

JUnit Tutorial for Beginners in 5 Steps. Setting up a basic JUnit example and understanding the basics of junit.

JPA and Hibernate Tutorial For Beginners - 10 Steps with Spring Boot and H2

JPA and Hibernate in 10 Steps with H2 - Setting up a basic project example with Spring Boot and in memory database H2. Its a cake walk.

Spring Boot Tutorial For Beginners in 10 Steps

Introduction to Spring Boot in 10 Steps. Learn the basics of Spring Boot setting up a basic project example with Spring Boot.

Spring Framework Tutorial for Beginners - Your First 10 Steps

Learn the basics of Spring Framework setting up a very simple example.