Hello everyone,
So, recently I have been learning Amazon EventBridge as part of my continuous cloud learning journey. I'm a DevOps engineer exploring how we can build event-driven architecture on AWS, and EventBridge felt like one of those underrated tools that deserves more spotlight.
In this post, I'll walk you through what things I have learned about Amazon EventBridge in simple words.
Before directly learning about the tool, I first understood the concept of Event-Driven Architecture, like exactly what is it.
What is Event-Driven-Architecture (EDA)?
-> In simple words, Event-Driven-Architecture is a software design pattern where services communicates asynchronously through events, allowing for flexibility or loose coupling.
You may think that okay, we got the concept of EDA, but what is an event actually here in EDA..
What is an Event in EDA?
-> In Event-Driven Architecture (EDA), an event represents a significant change in state of an occurrence within a system or service. Events are used to trigger an action or communicate with different parts of other services or system.
After this, I got a clear understanding of the concept. And then I started learning about the tool.
Let's understand now about the Amazon EventBridge.
What is Amazon EventBridge?
-> Amazon EventBridge is a serverless service. It allows different services — AWS, custom apps, or even SaaS — to talk to each other through events instead of direct API calls. It helps you work smarter by letting you filter events, change them if needed, and send them exactly where they need to go.
So there, you may have a question that When do we have to use this tool..
AWS EventBridge can be used for different tasks, like:
- Integrating AWS services like Lambda and CloudWatch to respond to events.
- Real-time data processing by triggering actions instantly.
- Automating event-driven architectures with decoupled services.
- Scheduling tasks using built-in scheduler rules.
- Monitoring & auditing via CloudWatch metrics and logs.
- Connecting SaaS apps and third-party event sources seamlessly.
After doing so much of task by one single tool, you may think that Amazon EventBridge does so much, I think it may be costly. But you are very much wrong here. EventBridge is not that expensive as you think.
Amazon EventBridge Pricing
- Pricing is usage-based, not rule/schema-based.
- AWS events (on default event bus) are free.
- Custom, third-party, or cross-account events cost $1 per million events.
- Additional charges may apply for event replays and data processing.
- It’s a serverless model, so you only pay for what you use.
Amazon EventBridge has Key Features, let's look at the most important features and components of EventBridge.
1. Event Bus
Amazon EventBridge acts as an intelligent event broker called an event bus, receiving JSON-formatted events from various sources and forwarding them to targets based on rules. Each event bus supports up to 300 rules and can route events to a maximum of 5 targets. The default event bus in every AWS account handles events from AWS services, while custom event buses can be created for applications or third-party SaaS integrations. For example, an event bus can listen for S3 upload events and trigger a Lambda function to process the uploaded object automatically.
2. Pipes
Amazon EventBridge Pipes provide point-to-point, asynchronous communication between specific AWS services. Each pipe connects a single source (like DynamoDB Streams, Kinesis, Amazon MQ, MSK, Kafka, or SQS) to a single target, with optional filtering and enrichment. Unlike event buses, pipes don’t use rules—instead, they filter events using schema-based patterns. If needed, events can be enriched before reaching the target using Lambda functions, Step Functions, API Gateway, or API Connections. This allows additional data to be fetched or transformed, making the event ready for the target system.
3. Schedulers
Amazon EventBridge Scheduler allows events to be triggered on a fixed schedule rather than by actions. It supports time-based or recurring schedules and can target over 300 AWS services, including specific actions like "invoke" in AWS Lambda. Users define the payload in JSON to be sent during the trigger. It’s useful for automating periodic tasks like backups or keeping Lambda functions warm to avoid cold starts.
4. Schema Registry
Amazon EventBridge offers a Schema Registry feature that helps manage complex event structures. Since events are in JSON and can be deeply nested, schemas act as templates that define the structure of events from a source. Developers can generate code bindings in languages like Python or Go, making it easier to write logic for processing these events. EventBridge can also automatically discover schemas and store them in a registry, helping simplify development and integration with other services.
5. Replays
Amazon EventBridge supports event replays by allowing you to archive and manually reprocess past events. This is helpful for debugging or retrying failed events without disrupting the system. You can set up archives on event buses with a defined retention period, making past events available for replay as needed.
That’s a Wrap!
These notes covered the core building blocks of Amazon EventBridge. Whether you're just exploring serverless architecture or actively building event-driven workflows, EventBridge offers the flexibility and power to automate with precision.
Keep experimenting, keep automating — the cloud’s the limit!
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