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Understanding Resiliency in Applications & Services: What It Is and How to Build It

Updated: Feb 14, 2023

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Understanding Resiliency in Applications & Services: What It Is and How to Build It - The Geeky Minds
Understanding Resiliency in Applications & Services: What It Is and How to Build It

Businesses and organizations in today's digital world rely significantly on technology to keep their operations running properly. It is vital to make sure that apps and services are resilient given the growing relevance of technology.

Applications and services that are resilient are able to bounce back from setbacks, adjust to shifting situations, and carry on offering services to users despite challenging circumstances. In this blog, we will explore the concept of resiliency and its significance in ensuring the success and longevity of applications and services in the tech-driven world.

Let's dive right in -

Introduction: Defining Resiliency for Applications & Services

Resiliency is an essential factor when it comes to applications and services. Resiliency is a term that is often used in the context of computer systems, and it refers to the ability of a system to continue functioning despite the occurrence of unexpected events or failures. In other words, resiliency is the system's ability to maintain its performance and avoid downtime in the face of adverse conditions or issues.

Resiliency - The Geeky Minds

It is a measure of how well an application or service can continue to function in the event of failures or disruptions. A resilient application has a higher uptime resulting in the best user experience.

A crucial element of the resilience of applications and services is high availability. Organizations can guarantee that their applications are always available even in the event of disruption or failure by building their apps and services with resiliency in mind. In this manner, businesses can ensure that their customers will always be able to access their services without interruption.

What Are the Most Common Aspects of Application/Service Resiliency?

Some of the most common features of application/service resiliency are fault tolerance, disaster recovery planning, elasticity, and scalability.

  • A system with fault tolerance can function even when some of its components fail.

  • Planning for disaster recovery helps applications in getting ready for unforeseen emergencies.

  • Elasticity and scalability allow applications to adjust resources according to changing workloads and user demands.

A fault tolerant System
A Fault Tolerant System

Organizations should make sure that their apps and services are resilient enough to manage any unforeseen disasters or disruptions by putting these components in place.

How to Implement Application/Service Resiliency at the Design Phase

Implementing resiliency during the design phase can help to minimize downtime and ensure that users have access to the service without interruption. A system can become resilient through a variety of strategies. Important ones among them are :

  • Redundancy: Implementing redundancy is one of the most popular methods for achieving resilience. This includes setting up multiple copies of essential system components so that, in the event of a failure, the others will take over. For example, having multiple servers in a load-balanced configuration provides a level of redundancy that helps ensure high availability.

  • Load Balancing: Another tactic for achieving resilience is load balancing, which helps distribute traffic equally among several servers, lowering the possibility of one server being overloaded and failing.

  • Monitoring and Alerting: Being able to keep an eye out for problems and failures in the system and being informed when they do is essential to building resilience. This enables system administrators to act swiftly in response to problems and stop downtime.

  • Disaster Recovery Planning: Disaster recovery planning is a crucial component of resiliency since it aids organizations in preventing and responding to unforeseen catastrophes like hardware failures, cyberattacks, and other failures. This can include installing backup and disaster recovery technologies as well as creating a thorough disaster recovery plan.

  • Architecture Design: The design of the system architecture is also critical to achieving resiliency. This can involve implementing microservices, which provide a level of modularity that makes it easier to isolate and recover from failures. Additionally, the use of containers, such as Docker, can help ensure that the system remains operational, even if one component fails.

  • Automation can help reduce manual interventions which can lead to errors.

Example of a redundant fault tolerant system
Example of a Redundant Fault Tolerant System

Organizations may make sure that their apps and services are dependable and robust even in times of crisis or unforeseen events by applying these steps during the design phase.

How to Test & Monitor Application/Service Resiliency?

When creating a web application or service, resilience is a key consideration. It is critical to guarantee that the application or service can handle any unexpected occurrences, such as sudden spikes in user traffic or system breakdowns.

To do this, developers must test and keep track of the resilience of their applications and services using tools for load testing, performance benchmarking, and availability testing. Such tools are widely available. Simply perform a Google search!

What Advantages Do Highly Resilient Applications or Services Offer?

Resiliency helps to ensure that any unexpected or unusual events do not cause disruption and downtime. Businesses can benefit from decreased downtime expenses, increased customer satisfaction and loyalty, improved customer loyalty, increased productivity, and increased efficiency with a highly robust application or service.

Applications and services that are highly resilient are designed to be able to manage unforeseen catastrophes without being interrupted. This means that they can continue to function even if there are issues with the system's foundational infrastructure or individual component parts.

This makes it possible for applications to continue operating normally, which improves customer satisfaction and loyalty and boosts productivity and efficiency.

Some key benefits of resiliency in system design are:

  • Improved reliability: Because resilient systems are less likely to fail, they are more dependable and capable of offering users regular, dependable services.

  • Improved availability: Because resilient systems can keep working in the face of failures or other unfavorable circumstances, they are more accessible and can give users the services they require.

  • Increased stability: Resilient systems are more stable because they can tolerate failures or unfavorable circumstances without collapsing or experiencing protracted downtime.

  • Better user experience: Users of resilient systems are less likely to experience service interruptions or outages, which can improve the user experience.

  • Increased trust: Users and stakeholders have more faith in resilient systems since they are aware that they will keep working even in the face of failures or unfavorable circumstances.

A resilient system builds Trust
A resilient system builds Trust

Because it helps to ensure that systems are dependable, available, stable, and able to provide a pleasant user experience even in the event of failures or unfavorable circumstances, resilience is an essential component of system design.

Avoid These Common Mistakes When Creating a Resilient System

When building a resilient system, it's important to avoid common pitfalls that can compromise the resilience of the system. A few of these are:

  • Neglecting the significance of resiliency can lead to a system that is not resilient because resiliency was not given enough attention during the design and development process.

  • Strictly concentrating on availability can make a system less resistant to other types of failures, such as data loss or system crashes, even though availability is crucial.

  • Underestimating the difficulty of resilience can lead to systems that are less resilient than expected. Building a resilient system can be complicated, and doing so can involve a lot of resources and work.

  • Relying on a single component or service for essential functionality can make a system vulnerable to failure. This is known as a single point of failure.

  • Not taking into account the human element: Since both people and processes can lead to failure, it's critical to take into account the human element and implement processes to reduce the risk of human mistakes.

  • Neglecting testing and validation: A system may not be as resilient as planned if testing and validation of its resilience are neglected.

  • Neglecting routine maintenance and upgrades might lead to a system that ages more slowly and becomes less resilient.

In order to create a robust system, it's crucial to avoid these typical mistakes by prioritizing resilience, taking into account all possible failure scenarios, accepting the complexity of resilience, avoiding single points of failure, taking into account the human component, extensively testing and validating the system, and maintaining and updating the system over time.

Conclusion – Increase the Resilience of Your Applications

We talked about how crucial it is to make your apps more resilient. There are various approaches to ensure your apps remain resilient and reliable, from implementing redundancy and failover strategies to integrating AI and machine learning. You can make sure that your applications are ready for any situation by taking the time to carefully examine any potential risks and weaknesses.

And that's a wrap! Hi, I am Gourav Dhar, a software developer and I write blogs on Backend Development and System Design. Subscribe to my Newsletter and learn something new every week -



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