vtex-io-events-and-workers

To make VTEX IO event handlers idempotent, you must explicitly record durable processing state and handle partial failures to prevent inconsistent side effects when duplicate broadcast events are delivered.

The best way to process background jobs in VTEX IO without blocking requests is using async event handlers and workers, which isolate expensive work from the main request path and ensure retry-safe processing.

VTEX IO background workers duplicate side effects on retry because delivery is at-least-once. Without explicit handler idempotency and durable processing state, replayed events trigger duplicate external syncs.

Yes, you need explicit async input contracts for VTEX IO event handlers. Using explicit async payload inputs instead of request-bound context keeps handlers independent from HTTP-only assumptions and ensures stable async processing.

To record partial-failure in VTEX IO batch processing, you implement clear partial-failure recording within your event handlers, ensuring durable processing state tracks which items failed to allow safe targeted retries.

Yes, you can use VTEX IO workers for cross-service fan-out integration. They support event-driven integrations and delayed jobs, requiring durable processing state to manage at-least-once delivery safely.