优雅关机

application.yml

server:
  shutdown: graceful # 开启优雅关机，默认IMMEDIATE是立即关机
  
management:
  endpoint:
    shutdown:
      enabled: true
  endpoints:
    web:
      exposure:
        include: "shutdown"
      base-path: /monitor

在使用若依框架实践中发现，似乎不需要此配置也可以实现优雅停机；而此并不会等待线程池的任务完成才关闭，需要再进行以下配置

优雅关闭线程池

    @Bean
    public ThreadPoolTaskExecutor collectThreadPoolExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setCorePoolSize(16);
        executor.setMaxPoolSize(96);
        executor.setQueueCapacity(1024);
        executor.setKeepAliveSeconds(30);
        executor.setThreadNamePrefix("xxxx任务");
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        executor.initialize();
        
        // 优雅关闭线程池
        executor.setWaitForTasksToCompleteOnShutdown(true);
        executor.setAwaitTerminationSeconds(60);
        
        return executor;
    }

参考

• Java 并发编程 - 线程池优雅关闭（四） - 掘金 (opens new window)
• 线程池：ThreadPoolExecutor 和 ThreadPoolTaskExecutor 简述 – 古红色阿尔卑斯棒棒糖 (opens new window)

记一个坑

在实践中发现，使用在 Linux 下使用 kill -2 pid 并不是实现优雅关闭程序，需要配合 actuator

参考

• How to gracefully handle the SIGKILL signal in Java - Stack Overflow (opens new window)