message-queues

Idempotent consumers deduplicate asynchronous messaging processing even if messages are delivered multiple times. You implement them by standardizing queue-based patterns with explicit dedup checks to ensure each message is processed exactly once.

The transactional outbox pattern ensures reliable asynchronous messaging by performing atomic writes to both the database and published events. This transactional outbox usage guarantees consistency and prevents lost messages across projects.

Dead letter queues collect and surface asynchronous messaging failures for investigation and recovery. You handle retries by implementing exponential backoff with jitter, creating resilient systems that avoid thundering herd effects.

Yes, tenant-aware envelopes isolate and route messages by tenant_id. The pattern guides technology choices across RabbitMQ, Redis Streams, and Kafka to implement safe acknowledgement semantics for multi-tenant contexts.

The best way to prevent duplicate asynchronous messages is standardizing queue-based patterns with idempotent consumers and dead letter queues. This approach ensures safe acknowledgement semantics and surfaces failures for recovery.