Guides
Learn how to build reliable distributed systems with QueueBear. These guides cover patterns for eventual consistency, failure handling, and multi-service coordination.
Eventual Consistency
Design systems that guarantee eventual consistency across microservices, even when services experience prolonged downtime or intermittent failures.
- Delivery semantics (at-least-once with deduplication)
- Step caching for exactly-once execution
- Idempotency keys and deduplication IDs
- Consistency windows and timing
Saga Patterns
Implement saga patterns for distributed transactions with compensating transactions to maintain data consistency across services.
- Orchestration vs choreography
- Compensating transactions with try/catch
- Idempotent compensation steps
- Long-running sagas with human approval
Handling Downtime
Strategies for handling prolonged service unavailability, from retry configuration to Dead Letter Queue recovery.
- Retry behavior and exponential backoff
- Dead Letter Queue monitoring and recovery
- Event-based waiting for dependencies
- Workflow checkpoint and resume
Multi-Service Orchestration
Coordinate operations across multiple microservices using workflows as central coordinators.
- Sequential and parallel orchestration
- Event-driven coordination
- Handling partial failures
- Complete e-commerce example with 5 services