Amazon EventBridge is a serverless event bus service that enables you to build event-driven architectures by connecting applications using events. In the context of workload migration and modernization, EventBridge plays a crucial role in decoupling application components and facilitating seamless …Amazon EventBridge is a serverless event bus service that enables you to build event-driven architectures by connecting applications using events. In the context of workload migration and modernization, EventBridge plays a crucial role in decoupling application components and facilitating seamless integration between legacy systems and modern cloud-native services.
EventBridge receives events from various sources including AWS services, custom applications, and SaaS partners. These events are routed to target services based on rules you define, enabling real-time responses to changes in your environment.
Key features relevant to migration and modernization include:
**Event Buses**: You can create custom event buses to organize events from different applications or environments, making it easier to manage hybrid architectures during migration phases.
**Schema Registry**: EventBridge automatically discovers and stores event schemas, simplifying integration efforts when connecting new and existing systems.
**Archive and Replay**: Events can be archived and replayed, which is valuable for testing modernized applications against historical data patterns.
**Cross-Account and Cross-Region**: EventBridge supports sending events across AWS accounts and regions, facilitating gradual migration strategies and multi-account architectures.
**Integration Patterns**: During modernization, EventBridge helps break down monolithic applications by enabling microservices to communicate through events rather than tight coupling.
For Solutions Architects, EventBridge is essential when designing loosely coupled, scalable architectures. It integrates natively with services like Lambda, Step Functions, SNS, SQS, and API Gateway, allowing you to build sophisticated workflows.
Common use cases during migration include triggering automated responses to infrastructure changes, coordinating data synchronization between on-premises and cloud systems, and enabling real-time analytics on application events.
EventBridge supports content-based filtering, allowing precise routing of events to appropriate targets based on event content, reducing unnecessary processing and costs while maintaining responsive architectures.
Amazon EventBridge - Complete Guide for AWS Solutions Architect Professional
What is Amazon EventBridge?
Amazon EventBridge is a serverless event bus service that enables you to build event-driven architectures by connecting applications using events. It was formerly known as Amazon CloudWatch Events and has evolved into a more powerful service for integrating AWS services, SaaS applications, and custom applications.
Why is Amazon EventBridge Important?
EventBridge is crucial for modern cloud architectures because it:
• Enables loose coupling between microservices and applications • Reduces operational overhead by eliminating the need to manage messaging infrastructure • Supports event-driven architectures that scale automatically • Integrates with 100+ AWS services and third-party SaaS providers • Facilitates workload modernization by decoupling legacy systems from new applications
How Amazon EventBridge Works
Core Components:
1. Event Bus - A router that receives events and delivers them to targets. You can have: • Default event bus (receives events from AWS services) • Custom event buses (for your applications) • Partner event buses (for SaaS integrations)
2. Events - JSON objects that represent a change in state or an update. Events contain: • Source (who generated the event) • Detail-type (type of event) • Detail (event-specific information)
3. Rules - Match incoming events and route them to targets. Rules use event patterns to filter events.
4. Targets - AWS services or resources that process events (Lambda, Step Functions, SNS, SQS, Kinesis, etc.)
• Schema Registry - Automatically discovers and stores event schemas, enabling code generation • Archive and Replay - Store events and replay them for debugging or reprocessing • Cross-account and Cross-region - Send events between AWS accounts and regions • Event Patterns - Content-based filtering using JSON patterns • Input Transformation - Modify event data before sending to targets • Dead Letter Queues - Capture events that fail to reach targets • Scheduled Events - Trigger targets on a schedule using cron or rate expressions
Common Use Cases
• Triggering Lambda functions based on AWS service events • Building event-driven microservices architectures • Integrating SaaS applications with AWS workflows • Automating operational tasks and remediation • Fan-out patterns to multiple consumers • Cross-account event sharing in multi-account architectures
Exam Tips: Answering Questions on Amazon EventBridge
Scenario Recognition:
• When you see "event-driven" or "loosely coupled" - think EventBridge • When you see "react to state changes" in AWS services - EventBridge is likely the answer • When you see "schedule-based triggers" for Lambda or Step Functions - consider EventBridge • When you see "SaaS integration" with AWS - EventBridge partner integrations • When you see "cross-account events" - EventBridge supports this natively
EventBridge vs. Other Services:
• EventBridge vs. SNS: EventBridge offers content-based filtering on event attributes; SNS uses topic-based routing. Choose EventBridge for complex routing logic. • EventBridge vs. SQS: EventBridge is for routing and filtering; SQS is for queuing and buffering. They often work together. • EventBridge vs. Kinesis: Kinesis is for high-volume streaming data; EventBridge is for discrete events with routing logic.
Key Limits to Remember:
• Up to 300 rules per event bus • Up to 5 targets per rule • Events are retained for 24 hours by default • Maximum event size is 256 KB
Architecture Patterns:
• For fan-out to multiple services based on event content - use EventBridge with multiple rules • For audit and compliance - use Archive feature to store all events • For disaster recovery testing - use Replay to test event processing • For multi-account architectures - use cross-account event buses with resource policies
Common Exam Traps:
• Do not confuse EventBridge with Step Functions - Step Functions orchestrates workflows, EventBridge routes events • Remember that EventBridge Scheduler (separate feature) is for one-time or recurring scheduled tasks • EventBridge Pipes provide point-to-point integrations with filtering and enrichment - different from event buses