How to ensure that @Scheduled timing tasks are executed only once in Spring Boot multi-node environment?

A strategy to prevent repeated execution of @Scheduled timed tasks in Spring Boot multi-node environment

In Spring Boot applications, the @Scheduled annotation is often used to configure timing tasks. However, how to avoid repeated execution of timing tasks becomes an important challenge when applications are deployed in multi-node environments. This article discusses how to ensure that tasks are executed only once in a multi-node environment while retaining the @Scheduled annotation.

Spring Boot's @Scheduled annotation relies on TaskScheduler for task scheduling, and ThreadPoolTaskScheduler is a commonly used implementation. In order to achieve task uniqueness in a multi-node environment, we can customize ThreadPoolTaskScheduler .

The specific method is to extend its functions when configuring ThreadPoolTaskScheduler to acquire the Redis distributed lock before the task is executed. Only the node that has obtained the lock can perform the task and release the lock after execution. In this way, even if multiple nodes are running at the same time, only one node can perform the task, effectively avoiding repeated execution.

This method can easily extend single-node timing tasks to multi-node environments without modifying the original @Scheduled annotation, ensuring the uniqueness of the task and the stable operation of the system.

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