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应用环境
springboot
dependencygroupIdorg.springframework.boot/groupId查看部署日志发现kill命令执行后应用pid还存在导致必须在60秒等待期后kill -9杀死springboot进程
应用环境
springboot
dependencygroupIdorg.springframework.boot/groupIdartifactIdspring-boot-starter/artifactIdversion2.6.3/version
/dependencyspringcloud
dependencygroupIdcom.alibaba.cloud/groupIdartifactIdspring-cloud-alibaba-dependencies/artifactIdversion2021.0.1.0/versiontypepom/typescopeimport/scope
/dependency监控
dependencygroupIdorg.springframework.boot/groupIdartifactIdspring-boot-starter-actuator/artifactIdversion2.6.3/version
/dependency原因分析
通过将全部日志调整为debug级别观察到有个定时任务线程在不断执行例子如下
SpringBootApplication
MapperScan(com.test.test.mapper)
public class TestApplication implements CommandLineRunner {static ScheduledExecutorService executor;public static void main(String[] args) {executor Executors.newScheduledThreadPool(1);SpringApplication.run(TestApplication.class, args);}private static void run(ScheduledExecutorService executor) {executor.scheduleAtFixedRate(() - {System.out.println(run);}, 0, 1, TimeUnit.SECONDS);Overridepublic void run(String... args) throws Exception {run(executor);}
}上述代码中由于线程定义默认是非守护线程执行优雅停机后在用户线程停止后非守护线程不会自动停止 解决办法
定义为守护线程 对于非业务逻辑例如监控数据上传日志记录这样做非常方便但对于系统业务这么做会导致未执行完成任务被丢弃。将线程池定义为springbean交予spring容器管理其生命周期
SpringBootApplication
MapperScan(com.test.test.mapper)
public class TestApplication implements CommandLineRunner {public static void main(String[] args) {SpringApplication.run(TestApplication.class, args);}private static void run(ScheduledExecutorService executor) {executor.scheduleAtFixedRate(() - {System.out.println(run);}, 0, 1, TimeUnit.SECONDS);}Beanpublic ScheduledExecutorService executor() {return Executors.newScheduledThreadPool(1);}Overridepublic void run(String... args) throws Exception {ScheduledExecutorService executor SpringUtil.getBean(ScheduledExecutorService.class);run(executor);}
}效果 弊端此类方式中由于线程池的工作线程属于非守护线程应用会等待所有任务执行完成后才关闭。由于容器已经关闭数据库连接池已经释放这时候任务再获取spring容器内容会报错因此这种方案只适用于用户日志记录监控等非业务功能效果如下
SpringBootApplication
MapperScan(com.test.test.mapper)
Slf4j
public class TestApplication implements CommandLineRunner {public static void main(String[] args) {SpringApplication.run(TestApplication.class, args);}private static void run(ExecutorService executor) {executor.execute(() - {log.info(start);try {TimeUnit.SECONDS.sleep(25);User user SpringUtil.getBean(IUserService.class).findById(10L);log.info(用户信息: user);} catch (Exception ex) {ex.printStackTrace();}log.info(end);});}Beanpublic ExecutorService executor() {return new ThreadPoolExecutor(10, 10, 10, TimeUnit.SECONDS,new ArrayBlockingQueue(1),r - {Thread thread new Thread(r);return thread;},new ThreadPoolExecutor.DiscardOldestPolicy());}Overridepublic void run(String... args) throws Exception {ExecutorService executor SpringUtil.getBean(ExecutorService.class);run(executor);}
}3.使用spring提供的ThreadPoolTaskExecutor线程池
SpringBootApplication
MapperScan(com.test.test.mapper)
Slf4j
public class TestApplication implements CommandLineRunner {public static void main(String[] args) {SpringApplication.run(TestApplication.class, args);}private static void run(ThreadPoolTaskExecutor executor) {executor.execute(() - {log.info(start);try {TimeUnit.SECONDS.sleep(25);User user SpringUtil.getBean(IUserService.class).findById(10L);log.info(用户信息: user);} catch (Exception ex) {ex.printStackTrace();}log.info(end);});}Beanpublic ThreadPoolTaskExecutor executor() {int core Runtime.getRuntime().availableProcessors();ThreadPoolTaskExecutor executor new ThreadPoolTaskExecutor();executor.setCorePoolSize(core 3 ? core 1 : core);int maxSize core 2;executor.setMaxPoolSize(maxSize);//使用同步队列避免任务进入等待队列排队导致耗时过长executor.setQueueCapacity(0);executor.setKeepAliveSeconds(30);executor.setWaitForTasksToCompleteOnShutdown(true);executor.setAwaitTerminationSeconds(25);executor.setThreadNamePrefix(async-);executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());executor.initialize();return executor;}Overridepublic void run(String... args) throws Exception {ThreadPoolTaskExecutor executor SpringUtil.getBean(ThreadPoolTaskExecutor.class);run(executor);}
}从上图可以看到应用会等待线程池任务执行完毕后才选择优雅关闭因此对于异步业务任务ThreadPoolTaskExecutor才是首选。 spring已经内置了ThreadPoolTaskExecutor 线程池实例我们可以尝试修改其配置参数简化代码来尝试例如
spring:task:execution:pool:queue-capacity: 0core-size: 2max-size: 16keep-alive: 30sthread-name-prefix: async-shutdown:await-termination: trueawait-termination-period: 25sSpringBootApplication
MapperScan(com.test.test.mapper)
Slf4j
public class TestApplication implements CommandLineRunner {public static void main(String[] args) {SpringApplication.run(TestApplication.class, args);}private static void run(ThreadPoolTaskExecutor executor) {executor.execute(() - {log.info(start);try {TimeUnit.SECONDS.sleep(25);User user SpringUtil.getBean(IUserService.class).findById(10L);log.info(用户信息: user);} catch (Exception ex) {ex.printStackTrace();}log.info(end);});}Overridepublic void run(String... args) throws Exception {ThreadPoolTaskExecutor executor SpringUtil.getBean(ThreadPoolTaskExecutor.class);run(executor);}
}效果与上述手动创建效果一样但是内置的ThreadPoolTaskExecutor线程池无法通过配置修改拒绝策略rejectedExecutionHandler队列满了之后默认是AbortPolicy会丢弃加入的任务并抛异常spring内置此线程池的初衷在于为定时任务使用例如Scheduled。
