Pros and Cons of Microservices – The Trending Business Architecture
What is Microservices?
A microservices architecture is a suite of small, autonomous services which are independently self-contained and implemented to a single business capability.
- Services can be deployed independently. A team can update an existing service without rebuilding and redeploying the entire application.
- Services are responsible for persisting their own data or external state. This differs from the traditional model, where a separate data layer handles data persistence.
- Services communicate with each other by using well-defined APIs. Internal implementation details of each service are hidden from other services.
- Services don’t need to share the same technology stack, libraries, or frameworks.
What’s special about Microservices?
- Agility: These independently deployable services can be easily managed mainly during bug fixes and feature releases. Unlike traditional application, the service can be updated without redeploying the entire application.
- Small, focused teams: The microservices have short development cycles, which can be managed by a small development team eliminating dependency between teams that helps in promoting greater agility and increase productivity.
- Small code base: Each service is a separate code-base, that in turn minimizes dependencies, and that makes it easier to add new features.
- Mix of technologies: Teams can pick the technology that best fits their service, using a mix of technology stacks as appropriate.
- Scalability: Services can be scaled independently, letting you scale out subsystems that require more resources, without scaling out the entire application. Using an orchestrator such as Kubernetes or Service Fabric, you can pack a higher density of services onto a single host, which allows for more efficient utilization of resources.
- Data isolation: Contrast to monolithic applications, the schema updates can be easily updated without affecting the other parts of the application.
What are the Stumbling blocks in Microservices Architecture Integration?
The benefits of microservices don’t come for free. Here are some of the challenges to consider before embarking on a micro services architecture.
- Complexity: A microservices application has more moving parts than the equivalent monolithic application. Each service is simpler, but the entire system as a whole is more complex.
- Development and testing: Due to different runtime environment, each service requires individualized testing and monitoring, which means organizations have to consider automation tools.
- Lack of governance: The decentralized approach leads to the inclusion of different languages and frameworks, which in turn makes the maintenance difficult.
What is an API gateway?
The API gateway is the entry point for clients. Instead of calling services directly, clients call the API gateway, which forwards the call to the appropriate services on the back end.
Pros and Cons of using an API gateway include:
- It decouples clients from services. Services can be version-ed or re-factored without needing to update all of the clients.
- Services can use messaging protocols that are not web friendly, such as AMQP.
- The API Gateway can perform other cross-cutting functions such as authentication, logging, SSL termination, and load balancing.
- Complexity in client code as the track of multiple endpoints, and handle failures in a resilient way is difficult.
- A single operation might require calls to multiple services. That can result in multiple network round trips between the client and the server, adding significant latency.
- Each public-facing service must handle concerns such as authentication, SSL, and client rate limiting.
- Services must expose a client-friendly protocol such as HTTP or Web Socket.
- Services with public endpoints are a potential attack surface, and must be hardened.
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Going further, let’s see the Microservices architecture.Microservices Architecture:Microservices provides fine-grained services and lightweight protocols to follow.
It has plenty of other things except the Microservices themselves.Identity Provider:Manages the identity information and provides authentication services within a distributed network.Service Discovery:It is used to keep track of services, service addresses, and endpoints.Static Content:It stores static resources like pages and web content.Content Delivery Network (CDN):It serves static resources like web pages, web content, etc., in distributed networks.API Gateway:It serves as the client’s entry point and is a single point of contact for the client.
In turn it returns aggregated responses from underlying microservices.Management:It is used to maintain the nodes of services.Microservices architecture is used to build applications and each of these has certain characteristics.
They are:It fragments into many modular, loosely coupled components, and each of them performs discrete functions.These individual functions are useful to align with business capabilities.You can distribute these apps among the cloud and data centers.You can treat each function as an independent service that you can change, update, and delete without disrupting other applications.Microservices Vs. Monolithic What is Monolithic Architecture?A single unit is used to build monolithic architecture.
To build enterprise applications, there are three parts:Database: consisting of many tables usually in relational database management systems.Client-side user interface: consists of HTML pages or a JavaScript running in a browser.Server-side application: it will handle HTTP requests, execute domain-specific logic, retrieve and update data from the database, and use the HTML views which it sends to the browser.It is a single logical executable service.
To make any changes in the system the developer needs to build and deploy an updated version of the server-side application.With monolithic service, there are certain drawbacks:It has limited reuse across monolithic applications.Scaling monolithic applications is challenging.You can develop it using only a single development stack.What is Microservice:Whereas, as discussed above, Microservices is a collection of loosely coupled services.
What is microservices and why its important to enterprise growth?
If you are devoting funds to an app development process, just checkout several reasons of adopting microservices architecture.
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Migrating to Microservices has been beneficial to many Fortune 1000 companies, which confirms its transformation potential to a variety of industries.Our developers at Charter Global have expertise in Microservices, DevOps & QA Automation.
We have successfully implemented in several Fortune 1000 companies, including Financial, Healthcare, and Retail & Media.Charter Global recommends a practical three-step Microservices approach to focus on the business functionality allowing self-contained units to represent a module’s end-to-end functionality.Learn More about How to Implement Microservices Framework Developed by Charter GlobalMigration ApproachIn order to migrate to microservices, you must first make a decision on a microservices architecture.
Before trying to optimize its implementation, it is necessary to evaluate how the services will interact.
Next, continually optimize those speed gains that microservices architecture provides.
This requires flexibility in the tools used in deploying the architecture.To migrate to microservices, a practical three-step approach is suitable:Componentize: From your already existing applications, select a component and create a microservices implementation on a pilot basis.Collaborate: All stakeholders, programmers, and developers on the team should know about the techniques and lessons learned from the Pilot in Stage One.
This keeps them updated with new processes and initiatives.Connect: Complete the application and connect to users in a real-world scenario.Microservices BenefitsMicroservices Architecture comes with a lot of benefits.
The presence of an abundance of monochrome cathode ray tubes (CRTs) using P1 phosphor, resulted in the term ’green screen’.
The GUI was invented for distribution-based applications and it was not limited to 80 x 24 characters.
There are a handful of popular steps to application modernization that focus on a combination of microservices architecture, cloud migration, and exposing an application’s functionality via API.Dividing into microservicesApplication modernization can also involve dividing or breaking down a legacy application into a collection of smaller components or microservices.Source: https://www.ibm.com/In the illustration, a single application is divided into a collection of microservices or individual services within the app.
Each service would have its own database and data model.Mostly the strangler pattern is followed when dividing the application into parts.
Cloud migration for your IBM i application involves a complete plan, various migration options, and ROI calculation.Expose functionality via APIsA legacy IBM i application can be enhanced by securely exposing its functions or data via APIs without hampering its existing code.
This approach enables new, cloud native applications to leverage the capabilities of existing systems and data.
