dump thread 文件分析
dump thead 出现大量如下线程，最后导致线程都不执行。请教一下出现这种问题怎么解决或下面的dump日志表示什么意思，问题原因是什么？ 谢谢
"mcloud-backend_30" daemon prio=10 tid=0x00002b6a100dd800 nid=0x5957 waiting on condition [0x00002b68ffbce000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00000006c05a0088> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2043)
at java.util.concurrent.ArrayBlockingQueue.take(ArrayBlockingQueue.java:374)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1068)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
