具有corePoolSize = 0的ScheduledThreadPoolExecutor导致一个CPU核心上的100%负载

给出以下配置,ScheduledThreadPoolExecutor每五秒运行一个简单的任务:

int corePoolSize = 0;
ScheduledExecutorService executor = new ScheduledThreadPoolExecutor(corePoolSize);

Runnable task = () -> System.out.println("XXX");
executor.scheduleAtFixedRate(task, 5, 5, TimeUnit.SECONDS);

在Oracle JRE上1.8.0_66,由一个线程创建的线程ScheduledThreadPoolExecutor不断导致一个CPU内核100%负载.调查线程转储会显示以下堆栈跟踪:

"pool-1-thread-1" - Thread t@10
   java.lang.Thread.State: RUNNABLE
    at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.poll(ScheduledThreadPoolExecutor.java:809)
    at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1066)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

由于corePoolSize = 1池中仍有一个线程.但是,线程基本上始终处于状态TIMED_WAITING并因此处于空闲状态.

ScheduledThreadPoolExecutor具有corePoolSize = 0已知功能,未经验证的错误配置甚至是错误的行为是什么？

看起来你已经打JDK-8129861已经固定在Java中9.它也可以与JDK-8022642.