Why Microservices required

 Before understand microservice requirement lets understand how     systems was worked without microservices.

  Before microservice architecture  application was designed such a way where it can utilize all resources of system e.g. servers and keep application on one place .

In such applications it was many issues like .
1- Developer dependency 
2- System dependency  
3- Changes are slow 

Monolithic structures make changes to the application extremely slow. Modifying just a small section of code can require a completely rebuilt and deployed version of software.

If developers wish to scale certain functions of an application, they must scale the entire application, further complicating changes and updates. Microservices help to solve these challenges.

   

Why Microservices required:

Applications built as a set of independent, modular components are easier to test, maintain, and understand. They enable organizations to:

• Increase agility
• Improve workflows
• Decrease the amount of time it takes to improve production

While each independent component increases complexity, the component can also have added monitoring capabilities to combat it.

Here are the most common pros of microservices, and why so many enterprises already use them.

Developer independence

Each microservice will often be assigned a single dev team to maintain it. Thus, there is greater developer freedom and independence.

Small teams that are working in parallel can iterate faster than larger teams. When a single service takes off in popularity, the smaller team can also scale the services on their own without having to wait for a larger and more complex team.

Isolation & resilience

If one of the components should fail, due to issues like outdated technology or inability to further develop the code, developers are able to spin up another component while the rest of the application continues to function independently.

This capability gives developers the freedom to develop and deploy services as needed, without having to wait on decisions concerning the entire application.

Scalability

Because microservices are made of much smaller components, they can take up fewer resources and therefore more easily scale to meet increasing demand of that specific component.

As a result of their isolation, microservices can properly function even during large changes in size and volume, making it ideal for enterprises dealing with a wide range of platforms and devices.

Autonomously developed

As opposed to monoliths, individual components are much easier to fit into continuous delivery pipelines and complex deployment scenarios. Only the pinpointed service needs to be modified and redeployed when a change is needed. If a service should fail, the others will continue to function independently.

Its autonomous nature benefits teams because it:

• Enables scaling and development
• Doesn’t require much coordination with other teams

Microservices are a particular advantage when companies become more distributed and workers more remote.

Relationship to the business

Microservice architectures are split along business domain boundaries, organized around capabilities such as logistics, billing, etc. This increases independence and understanding across the organization: different teams are able to utilize a specific product and then own and maintain it for its lifetime.