AWS SQS vs SNS vs EventBridge? When to use what?
3 min read
AWS SQS, SNS, and EventBridge are all messaging services offered by Amazon Web Services that allow for communication between different applications and systems. Each service serves a different purpose and is best suited for different use cases. In this blog post, we will discuss each service in detail, provide examples of when to use each one, and explain how they can be used together to create a robust and powerful messaging system.
Simple Queue Service (SQS)
Simple Queue Service (SQS) is a fully managed message queuing service that enables you to send, store, and receive messages between distributed software systems. SQS is ideal for use cases where messages need to be stored and processed asynchronously, such as in a distributed system where different components need to communicate with one another without being tightly coupled.
For example, let's say you have an e-commerce website that needs to process customer orders. You can use SQS to decouple the order processing component from the rest of the system, by sending orders to an SQS queue for processing. This way, if the order processing component goes down, the rest of the system can continue to function, and the orders can be processed once the component is back online.
Simple Notification Service (SNS)
Simple Notification Service (SNS) is a fully managed messaging service that enables you to send push notifications to mobile devices and email, or send messages to other distributed systems via SQS or HTTP/S. SNS is ideal for use cases where messages need to be delivered in real-time, such as for sending alerts or notifications to users.
For example, let's say you have a weather forecasting application that needs to send notifications to users when severe weather is forecasted. You can use SNS to send push notifications to users' mobile devices in real time, providing them with timely information about severe weather.
Formerly called Amazon CloudWatch Events
EventBridge is a fully managed event bus that makes it easy to connect applications together using data from your own applications, SaaS applications, and AWS services. EventBridge enables you to process and route events across data streams and AWS services, making it ideal for cases where you need to process and route events in real time.
For example, let's say you have a serverless application that needs to process and route events from different sources. You can use EventBridge to route events from different sources to targets based on specific conditions. This way, you can process and route events in real time and take appropriate actions based on the event.
It is important to note that these services can also work together to create a robust and powerful messaging system. For example, you could use SNS to send real-time notifications to users, SQS to store those notifications asynchronously and EventBridge to route those notifications to specific targets based on certain conditions.
In conclusion, AWS SQS, SNS, and EventBridge are all powerful messaging services that can be used to build robust and scalable systems. Each service has its own strengths and weaknesses, and the best choice will depend on the specific requirements of your use case. SQS is best suited for asynchronous messaging and decoupling systems, SNS is best suited for real-time messaging and notifications, and EventBridge is best suited for real-time event-driven architectures and connecting different services. By understanding how these services can be used together and the specific use cases they are suitable for, you can create a messaging system that meets the needs of your application.