# Duplicate Side Effects

> Reprocessing a message so its side effects run more than once, corrupting state when not idempotent.

Record: `lexicon:duplicate-side-effects`
Kind: anti-pattern
Layer: [Execution Core](https://banes-lab.com/records/layer/execution-core.md)
Canonical: https://banes-lab.com/ontology/lexicon#lexicon-duplicate-side-effects

Listed in [Lexicon terms](https://banes-lab.com/api/records/lexicon.md), after [Direct Point-to-Point Calls](https://banes-lab.com/records/lexicon/direct-point-to-point-calls.md) and before [Global ACID Transaction](https://banes-lab.com/records/lexicon/global-acid-transaction.md).

## Category

- [Event Messaging Async](https://banes-lab.com/records/lexicon-category/event-messaging-async.md)

## Negated by

- [Idempotent Consumer](https://banes-lab.com/records/architecture/idempotent-consumer.md)

## Linked from

- [Event / Messaging / Asynchronous Architecture](https://banes-lab.com/ontology/principles/architecture-category-event-messaging-asynchronous-architecture.md)