multi-region active architecture on AWS

AWS Multi-Region Use Cases

When creating and constructing services, dependability and resilience are crucial. REST APIs are frequently used in businesses to deploy IoT devices and keep them connected to Wi-Fi. A multi-region active architecture can be very useful and efficient. So, let’s learn about the advantages of a multi-region active architecture and how you can build it.

Benefits of a Multi-region Active AWS Architecture

With high-speed connection and reliability across a variety of network segments and geographies, AWS offers a stylish, global network. These extensive worldwide networks can be used by businesses to create distributed system architectures and connect with customers throughout the world. AWS multi-region architectures benefit businesses in a number of important ways.

  • Firstly, they are always active-active arrangements and work simultaneously in 2 zones or more. With multiple availability zones and resilience for essential workloads, this distributed approach can improve the continuity of operations and spread the risk across geographically remote regions.
  • Secondly, AWS multi-region designs can improve application performance and user experience (UX). This architecture brings consumers closer to the application to address the potential disturbances and delays that arise when people visit an app from a distant location.
  • Finally, because they can disrupt the process with data integration and replication, each zone can retain its own distinct data set. However, the isolation allows organizations to observe data preservation and protection procedures.

Remember that creating and maintaining a multi-region active-active architecture effectively is challenging and requires certain expertise. What we will be discussing here is merely an introduction to building this awesome application architecture.

How to Build a Multi-region Active Architecture on AWS

All of the services on the client’s request pathway are distributed across various AWS Regions using a multi-region active-active architecture. Several factors must be met for this to succeed.

  1. Fast and dependable data replication across zones is needed.
  2. For your various areas to be connected, you require a global network architecture.
  3. Services must be neutral and should distribute information among all regions; they should not include localized regions.
  4. When possible, synchronized cross-regional communications ought to be eliminated. 
  5. Applications must make use of nearby facilities.
  6. Using DNS routing may allow for a variety of circumstances.

Continue reading to dig deeper into these requirements.

Efficient Data Replication

If you don’t already know of the CAP theorem, here is a quick overview.

According to the CAP theorem (Consistency, Availability, and Partition tolerance), no distributed database system can offer more than 2 of these 3 characteristics at once. But specifically, one must decide between availability and consistency in the case of a network partition.

Therefore, we end up with 2 options; we either give up consistency and benefit from the high availability of the system, or we give up availability which means the system remains consistent.

In our case, which is building a multi-region architecture, we cannot give up availability. So, we have to accept and forgo consistency and adopt asynchronous replication and systems.

When developing applications, it is important to understand the impact of asynchronous replication because, in addition to having an impact on architecture, it can also affect how users interact with the client user interface.

No spinning or loading notifications that stay on the screen indefinitely. Requests made to the server ought to be completely independent of the user interface. Additionally, this “trick” will deceive users into thinking the application is faster than it actually is, concealing transmission delay and even full-service breakdown.

This is also known as “graceful degradation,” and Netflix employs it to minimize a few breakdowns.

Global Network Architecture

In contrast to the open network, AWS Regions are linked to a private worldwide network infrastructure, which offers reduced costs and more reliable cross-region networking delays with many advantages, including:

  • improved packet delay, latency, and general quality
  • prevents issues with network connectivity bandwidth
  • higher level of operational control

Stateless Apps

In a stateless design, the servers handle every customer request separately from previous sessions or requests and shouldn’t save any local records of client interactions. A stateless program, therefore, gives every end user the same outcome when provided the same inputs.

Due to the fact that any request can be serviced by any computer resources available, stateless systems can scale widely.

Avoid International Calls And Make Use Of Local Resources

As was earlier stated, it is essential for apps to avoid increased latencies. To minimize latency, it is crucial to steer clear of simultaneous cross-region calls and ensure that resources are always accessible locally.

Strengthen your disaster recovery capacities by isolating writes from reads across several regions. This will also enable you to extend read processes into a location that is closest to your customers and make it simpler to migrate between regions.

This structure’s fundamental requirement is that all essential writes must route through a host computer system in the region where they originated.

DNS Routing

We have to employ a Domain Name System (DNS), which has adjustable routing protocols, to direct traffic across regions.

Domain name registration, health-checking web services, and DNS) are all offered by Amazon Route 53. The flexibility for traffic flow across a number of routing protocols, all of which may be paired with DNS redundancy, is, however, what matters the most about our application purpose.

Our Final Thoughts

If your application demands minimal latencies for users everywhere, multi-region active architectures are absolutely necessary, even though they are challenging to build, expensive, and difficult to maintain.

Now we have learned to adopt asynchronous architectures and designs, build apps that are completely stateless, and deploy all the functions on the client request pathway across various AWS Regions in order to devise a multi-region active architecture. Of course, if we want to ensure accurate data replication, we should use widely available services like DynamoDB or Amazon S3 that take advantage of the worldwide infrastructure that Amazon has built.

Further blogs within this AWS Multi-Region Use Cases category.