Microservices need to communicate reliably. The choice between synchronous and asynchronous patterns affects performance, reliability, and complexity.
Communication Styles#
Synchronous:
- Request/Response
- Client waits for response
- REST, gRPC
- Simpler to understand
Asynchronous:
- Fire and forget or pub/sub
- Decoupled services
- Message queues, events
- Better resilience
REST API Communication#
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gRPC Communication#
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Message Queue Communication#
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Event-Driven Communication#
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Service Discovery#
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API Gateway Pattern#
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Saga Pattern#
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Best Practices#
Synchronous:
✓ Use for queries and real-time needs
✓ Implement timeouts
✓ Add circuit breakers
✓ Handle partial failures
Asynchronous:
✓ Use for background processing
✓ Ensure idempotency
✓ Implement dead letter queues
✓ Monitor queue depths
General:
✓ Use correlation IDs
✓ Version your APIs
✓ Document contracts
✓ Test failure scenarios
Conclusion#
Choose communication patterns based on requirements. Use synchronous for real-time needs, asynchronous for resilience. Implement proper error handling, retries, and monitoring regardless of pattern.