深入分析Tomcat无响应问题及解决方法

时间:2022-06-02 00:19:40

  问题描述

  生产环境下有几台tomcat,但突然某个时候发现所有的请求都不能响应了,由于我们的web server使用的是nginx,会将请求反向到tomcat上,所以起初怀疑是nginx就没有收到请求,但查看日志后发现,nginx中大量出现499的返回,这说明问题还是出在tomcat上.

  问题排查

  首先我想到的是不是CPU跑满了,虽说CPU没有报警但还是本能的top命令看下系统负载,发现系统只有0.x的负载,cpu,内存消耗都是正常的.

  由于CPU没有出现异常,所以应该不是GC出现了问题,但还是检查了下GC log,果然GC也没问题

  此时必须让jstack上场了,果然在使用jstack后发现很多线程都是WAITING状态

  

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"http-nio-127.0.0.1-801-exec-498" daemon prio=10 tid=0x00002ada7c14f800 nid=0x16a6 waiting on condition [0x00002ada9c905000]
 
  java.lang.Thread.State: WAITING (parking)
 
  at sun.misc.Unsafe.park(Native Method)
 
  - parking to wait for <0x00000007873e6990> (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 org.apache.http.pool.PoolEntryFuture.await(PoolEntryFuture.java:133)
 
  at org.apache.http.pool.AbstractConnPool.getPoolEntryBlocking(AbstractConnPool.java:282)
 
  at org.apache.http.pool.AbstractConnPool.access$000(AbstractConnPool.java:64)
 
  at org.apache.http.pool.AbstractConnPool$2.getPoolEntry(AbstractConnPool.java:177)
 
  at org.apache.http.pool.AbstractConnPool$2.getPoolEntry(AbstractConnPool.java:170)
 
  at org.apache.http.pool.PoolEntryFuture.get(PoolEntryFuture.java:102)
 
  at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.leaseConnection(PoolingHttpClientConnectionManager.java:240)
 
  at org.apache.http.impl.conn.PoolingHttpClientConnectionManager$1.get(PoolingHttpClientConnectionManager.java:227)
 
  at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:173)
 
  at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:195)
 
  at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:85)
 
  at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:108)
 
  at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:186)
 
  at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
 
  at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:106)
 
  at com.weimai.utils.HttpClientUtil.doGet(HttpClientUtil.java:105)
 
  at com.weimai.utils.HttpClientUtil.doGet(HttpClientUtil.java:87)
 
  at com.weimai.utils.WeiBoUtil.checkUser(WeiBoUtil.java:214)
 
  at com.weimai.web.UserInfoController.newWeiboLogin(UserInfoController.java:1223)
 
  at sun.reflect.GeneratedMethodAccessor390.invoke(Unknown Source)
 
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 
  at java.lang.reflect.Method.invoke(Method.java:606)

  此时意识到问题应该出现http连接上,马上用netstat查看下801端口的连接状态,果然发现很多请求都是CLOSE_WAIT,这里简单解释下CLOSE_WAIT状态,如果我们的client程序处于CLOSE_WAIT状态的话,说明套接字是被动关闭的,整个流程应该是这样

  因为如果是server端主动断掉当前连接的话,那么双方关闭这个TCP连接共需要四个packet

  server -> FIN -> client

  server <- ACK <- client

  这时候server端处于FIN_WAIT_2状态,而我们的程序处于CLOSE_WAIT状态

  server <- FIN <- client

  这时client发送FIN给server,client就置为LAST_ACK状态。

  server -> ACK -> client

  server回应了ACK,那么client的套接字才会真正置为CLOSED状态

  我们的请求处于CLOSE_WAIT状态,而不是LAST_ACK状态,说明还没有发FIN给server,那么很简单,去看HttpClientUtil中如何处理就知道了,果然在查看HttpClientUtil代码中发现对于非正常关闭的http连接没有做abort,补充完善好try catch finally块后问题得到解决.