跨多个实例仅运行一次计划作业 [英] Running Only Once A Schedule Job Across Multiple Instances

问题描述

我有一个 schedule作业，该作业在每个月末运行.运行后，它将一些数据保存到数据库.

当我扩展应用程序(例如，具有2个实例)时，两个实例都运行计划作业并保存数据，并且一天结束时我的数据库具有相同的数据.

因此，我希望计划作业仅运行一次，而不管云中的实例数如何.

解决方案

您可以在方法中使用@SnapLock批注，以确保任务仅运行一次.请参阅此版本库中的文档 https://github.com/luismpcosta/snap-scheduler

示例:导入Maven依赖项

 < dependency>< groupId> io.opensw.scheduler</groupId>< artifactId>快照调度程序核心</artifactId>< version> 0.3.0</version></dependency> 

导入maven依赖项后，您需要创建所需的表表.

最后，在下面看到如何注释方法，该方法保证仅使用@SnapLock注释运行一次:

  import io.opensw.scheduler.core.annotations.SnapLock;...@SnapLock(键="UNIQUE_TASK_KEY"，时间= 60)@Scheduled(fixedRate = 30000)公共无效reportCurrentTime(){...} 

通过这种方法，您还可以保证对任务执行情况进行审核.

I have a schedule job that run every end of the month. After running it saves some data to database.

When i scale the app(for example with 2 instances) both instances run the schedule job and both save the data and at the end of day my database has the same data.

So i want the schedule job only run one time regardless of instances numbers at cloud.

解决方案

You can use @SnapLock annotation in your method which guarantees that task only runs once. See documentation in this repo https://github.com/luismpcosta/snap-scheduler

Example: Import maven dependency

<dependency>
  <groupId>io.opensw.scheduler</groupId>
  <artifactId>snap-scheduler-core</artifactId>
  <version>0.3.0</version>
</dependency>

After importing maven dependency, you'll need to create the required tables tables.

Finally, see bellow how to annotate methods which guarantees that only runs once with @SnapLock annotation:

import io.opensw.scheduler.core.annotations.SnapLock;
...

  @SnapLock(key = "UNIQUE_TASK_KEY", time = 60)
  @Scheduled(fixedRate = 30000)
  public void reportCurrentTime() {
    ...
  }

With this approach you also guarantee audit of the tasks execution.

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