服务器跑着跑着线程池都挂了java.lang.Thread.State: TIMED_WAITING (parking)

喜欢ヅ旅行 2022-12-17 01:21 134阅读 0赞

解决办法：增加了服务器的cpu数量和内存扩容，当然如果你是集群部署，可以考虑的是加服务器，降低目前的服务器的压力。

解决过程如下：  
通过一顿top，  
top -Hp pid，  
print “%x\\n” tid，  
jstack pid |grep tid -A 50  
的操作看见了如下异常堆栈，堆栈有所不同，但是终都是挂阻塞在Unsafe.park()的有限时长等待这里，这是一个本地方法，有限时长等待，就算它因为等待不到它要的条件或者资源，那么到时间了自然也会返回，但是奇怪的是，它们永远停在了这里

因为只有测试环境才频繁出现这个问题，正式环境一直运行良好，它们的差别在于cpu和内存的差异，测试环境使1核2G的，我不得不说一句：太抠了。。。。。

因为内存过小，所以考虑是不是因为内存太小，导致了大量的Gc从而使这些等待得不到cpu，因为确实然后就这样挂了，因为确实发现了频繁的GC，Full GC所以对内存扩容到了8G，但事后还是发生了这个事情，并且挂得更快了，那就加了cpu到2核，到目前已经一个多月过去了，没有再出现这个问题

java.lang.Thread.State: TIMED_WAITING (parking)
    	at sun.misc.Unsafe.park(Native Method)
    	- parking to wait for  <0x00000000af662cf0> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    	at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
    	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
    	at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1093)
    	at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809)
    	at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
    	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
    	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    	at java.lang.Thread.run(Thread.java:748)

TID: 2310 STATE: TIMED_WAITING
    sun.misc.Unsafe.park(Native Method)
    java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
    java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedNanos(AbstractQueuedSynchronizer.java:1037)
    java.util.concurrent.locks.AbstractQueuedSynchronizer.tryAcquireSharedNanos(AbstractQueuedSynchronizer.java:1328)
    java.util.concurrent.CountDownLatch.await(CountDownLatch.java:277)
    org.elasticsearch.client.RestClient$SyncResponseListener.get(RestClient.java:898)
    org.elasticsearch.client.RestClient.performRequest(RestClient.java:227)
    org.elasticsearch.client.RestHighLevelClient.performRequest(RestHighLevelClient.java:1256)
    org.elasticsearch.client.RestHighLevelClient.performRequestAndParseEntity(RestHighLevelClient.java:1231)
    org.elasticsearch.client.RestHighLevelClient.search(RestHighLevelClient.java:730)
    com.changjia.commodity.task.es.impl.EsSearchServiceImpl.search(EsSearchServiceImpl.java:31)
    
    ```cpp
    TID: 118 STATE: TIMED_WAITING
    sun.misc.Unsafe.park(Native Method)
    java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
    java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedNanos(AbstractQueuedSynchronizer.java:1037)
    java.util.concurrent.locks.AbstractQueuedSynchronizer.tryAcquireSharedNanos(AbstractQueuedSynchronizer.java:1328)
    com.aliyun.openservices.shade.com.alibaba.rocketmq.common.CountDownLatch2.await(CountDownLatch2.java:114)
    com.aliyun.openservices.shade.com.alibaba.rocketmq.common.ServiceThread.waitForRunning(ServiceThread.java:116)
    com.aliyun.openservices.shade.com.alibaba.rocketmq.client.impl.consumer.RebalanceService.run(RebalanceService.java:40)
    java.lang.Thread.run(Thread.java:748)