What is durable execution? fault tolerance guide

Durable execution is a programming model that ensures workflow states are automatically saved and can resume from the point of failure in case of crashes or infrastructure issues, preventing the need to re-execute already completed steps. This model is crucial for long-running workflows like order processing and payment systems, where retries can be costly and inefficient, especially when side effects such as sending emails or charging credit cards occur. The mechanism relies on event sourcing, where every workflow action is recorded in a persistent log, allowing workflows to recover and continue by replaying this log without repeating external calls. Platforms like Temporal, Azure Durable Functions, and Restate facilitate durable execution, each offering varying levels of integration and operational overhead. In AI automation, CodeWords uses Redis for state persistence to support workflows that maintain state across executions, though it leverages Temporal for more critical durable execution needs, integrating with AI processing tools such as OpenAI and Anthropic to enhance workflow efficiency without the hassle of API key management.

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