一直存在的DubboResponseTimeoutScanTimer

一直存在的DubboResponseTimeoutScanTimer

基于dubbo2.5.3

每次通过jstack pid出来的结果中都有:

"DubboResponseTimeoutScanTimer" daemon prio=10 tid=0x00007f5990002800 nid=0x7ba6 sleeping[0x00007f59fe5d1000]
   java.lang.Thread.State: TIMED_WAITING (sleeping)
	at java.lang.Thread.sleep(Native Method)
	at com.alibaba.dubbo.remoting.exchange.support.DefaultFuture$RemotingInvocationTimeoutScan.run(DefaultFuture.java:300)
	at java.lang.Thread.run(Thread.java:745)

   Locked ownable synchronizers:
	- None

在DefaultFuture.java中:

static {
   Thread th = new Thread(new RemotingInvocationTimeoutScan(), "DubboResponseTimeoutScanTimer");
   th.setDaemon(true);
   th.start();
}

而RemotingInvocationTimeoutScan是DefaultFuture中的一个静态内部类，随着启动就加载完成，成为守护线程