spring 启动计划任务挂起

Question

我使用 spring 引导和 @Scheduled 有一段时间了，但最近我发现有一个危险的潜在威胁，如下所述：我多次发现作为应用程序运行s 和计划任务运行，有许多线程仍在等待但未完成，这在 'kill -3' 的线程堆栈跟踪中显示。为了清除任何可能导致这个问题的东西，我做了一个完全虚拟的任务：

    @Component
public class TestJob
{
    /**
     * LOGGER
     */
    private static Logger log = LogManager.getLogger(TestJob.class);

    @Scheduled(fixedDelay = 60000, initialDelay = 1000)
    public void test()
    {
        log.info("---------------[{}]", Thread.currentThread().getId());
    }
}

这是我的日志：

20151102 11:54:50.660 | INFO | pool-3-thread-2 | ---------------[26] | TestJob.test(TestJob.java:19) 20151102 11:55:50.662 | INFO | pool-3-thread-4 | ---------------[28] | TestJob.test(TestJob.java:19) 20151102 11:56:50.664 | INFO | pool-3-thread-5 | ---------------[33] | TestJob.test(TestJob.java:19) 20151102 11:57:50.666 | INFO | pool-3-thread-6 | ---------------[37] | TestJob.test(TestJob.java:19)

线程堆栈跟踪：

"pool-3-thread-2" #26 prio=5 os_prio=0 tid=0x00007fbea0cd9800 nid=0x74f2 waiting on condition [0x00007fbf0d3d2000] java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method) - parking to wait for <0x0000000763ed3710> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039) at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1088) at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809) at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745)

"pool-3-thread-4" #28 prio=5 os_prio=0 tid=0x00007fbea0783800 nid=0x74f4 waiting on condition [0x00007fbf0d1d0000] java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method) - parking to wait for <0x0000000763ed3710> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039) at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1088) at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809) at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745)

计划的 javadoc 说

Processing of @Scheduled annotations is performed by registering a ScheduledAnnotationBeanPostProcessor.

我自己没有命名这个 class，只是用 @EnableScheduling 注释了 main class.

有人知道如何解决这个问题吗？

更新：

我附上一张Eclipse调试截屏的图片，池在增加，所有旧线程都在运行宁...希望它能澄清我的问题。

更新：我想这次我做对了。 spring 启动调度程序的默认池大小为 100，所有线程都处于运行ning 状态。我真的不明白，运行宁在什么？我认为应该等待某事，为什么不呢？有谁知道如何配置 spring boot scheduled pool size with annotation？我没有在我的应用程序中使用 xml，也不愿意只为调度程序引入它。

Answer 1

我在您的示例中看到了绝对正常的行为。您有计划任务，它每分钟由线程池中的不同线程执行。线程池中的线程处于线程池预期的等待（停放）状态。如果你想减少线程数，你可以配置： http://docs.spring.io/spring/docs/4.0.x/spring-framework-reference/htmlsingle/#scheduling

<task:scheduler id="scheduler" pool-size="2"/>

spring 启动计划任务挂起

spring boot scheduled task get hanging

spring

spring-scheduled

spring-boot