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Subject: Re: how http connector backlog attribute works?
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侯树成 wrote:
> Hi,
> I find a problem of http bio connector,I need help.
> You can find it in flowing steps:
> 
> 1.set tomcat connector like this:
>     <Connector port="8080" protocol="HTTP/1.1"
>                connectionTimeout="20000"
>                redirectPort="8443" acceptCount="1" maxThreads="1"
> minSpareThreads="1"/>
> 
> 2. deploy a war file, which contains a servlet that will sleep 60s in it's
> doPost method
> 
> 3. use LR or JMeter send 5 requests to the serlvet above
> 
> 4. use command jstack print current thread stack
> 
> NOTE: now the main acceptor thread stack like this:
> "http-bio-8080-Acceptor-0" daemon prio=6 tid=0x04b49800 nid=0x1a88 waiting
> on condition [0x0536f000]
>    java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for  <0x29a06cd0> (a
> org.apache.tomcat.util.threads.LimitLatch$Sync)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:156)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:811)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:969)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1281)
> at
> org.apache.tomcat.util.threads.LimitLatch.countUpOrAwait(LimitLatch.java:115)
> at
> org.apache.tomcat.util.net.AbstractEndpoint.countUpOrAwaitConnection(AbstractEndpoint.java:733)
> at org.apache.tomcat.util.net.JIoEndpoint$Acceptor.run(JIoEndpoint.java:210)
> at java.lang.Thread.run(Thread.java:662)
> 
> Now, In the 5 requests, 3 request will served correctly, but another 2
> requests will received "Connection refused error" like this
> 
> Caused by: java.net.ConnectException: Connection refused: connect
> at java.net.PlainSocketImpl.socketConnect(Native Method)
> at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)
> at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)
> at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)
> at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
> at java.net.Socket.connect(Socket.java:529)
> 
> Why the 2 requests not entering the thread pool executor or taskQueue, but
> get refused quickly?
> 
> Thanks in advance.
> 
Which java and Tomcat versions ?


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