Question

我注意到,我的java申请(在编外6号上)发现了许多没有终止的read。

因此,我制造了一条read子堆放场,并注意到有吨的read子等待着。

"pool-1-thread-22" prio=5 tid=101b4b000 nid=0x127122000 waiting on condition [127121000]
   java.lang.Thread.State: WAITING (parking)
    at sun.misc.Unsafe.park(Native Method)
    - parking to wait for  <6c340cee0> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:156)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1987)
    at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:399)
    at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:947)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
    at java.lang.Thread.run(Thread.java:680)
   Locked ownable synchronizers:
    - None

Now the question is: WHAT are these threads waiting for? I have suspect class which seems to spawn these threads but I don t know what exactly is making these threads stuck.

除了按行割裂阶级线和保持监测深层行为之外,我是否能够找到这一原因?

Answer 1

On tomcat, they re usually request worker threads waiting for someone to connect. Nothing to worry about. They re ready to handle those 100 users connecting at once to your server.

Answer 2

Those threads are part of a ThreadPool. More specificaly java.util.concurrent.ThreadPoolExecutor. The thread is waiting on a Runnable/Callable to be submitted to the pool. For example

ExecutorService e = Executors.newFixedThreadPool(10);

Will create 10 threads that will sit an wait until

e.submit(new Runnable(){
  public void run(){ ...}
});

然后将通知一个线索并援引该线。对我来说,他们正在使用什么是无法说的。你们必须找到开始的read子。或许会向应用程序服务器提出处理客户的请求。

友情链接