long running socketwrite

Wed, 30 Mar 2016 08:55:30 -0700 

Tomcat 7.0.47, JDK 7
I have following long running socketwrite thread (more than 10 sec). Wondering what could cause this so I can further look and investigate. 


"http-bio-28080-exec-1497" daemon prio=10 tid=0x00007f812c230800 
nid=0x72fa runnable [0x00007f80010f9000]

   java.lang.Thread.State: RUNNABLE
        at java.net.SocketOutputStream.socketWrite0(Native Method)

        at 
java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:113)

        at java.net.SocketOutputStream.write(SocketOutputStream.java:159)

        at 
org.apache.coyote.http11.InternalOutputBuffer.realWriteBytes(InternalOutputBuffer.java:215)
        at 
org.apache.tomcat.util.buf.ByteChunk.flushBuffer(ByteChunk.java:480)
        at 
org.apache.coyote.http11.InternalOutputBuffer.flush(InternalOutputBuffer.java:119)
        at 
org.apache.coyote.http11.AbstractHttp11Processor.action(AbstractHttp11Processor.java:805)

        at org.apache.coyote.Response.action(Response.java:174)

        at 
org.apache.catalina.connector.OutputBuffer.doFlush(OutputBuffer.java:366)
        at 
org.apache.catalina.connector.OutputBuffer.flush(OutputBuffer.java:333)
        at 
org.apache.catalina.connector.CoyoteOutputStream.flush(CoyoteOutputStream.java:101)
        at 
org.springframework.security.web.context.SaveContextOnUpdateOrErrorResponseWrapper$SaveContextServletOutputStream.flush(SaveContextOnUpdateOrErrorResponseWrapper.java:354)
        at 
com.sun.jersey.spi.container.servlet.WebComponent$Writer.flush(WebComponent.java:308)
        at 
com.sun.jersey.spi.container.ContainerResponse$CommittingOutputStream.flush(ContainerResponse.java:146)

        at sun.nio.cs.StreamEncoder.implFlush(StreamEncoder.java:297)
        at sun.nio.cs.StreamEncoder.flush(StreamEncoder.java:141)
        - locked <0x000000075a610750> (a java.io.OutputStreamWriter)
        at java.io.OutputStreamWriter.flush(OutputStreamWriter.java:229)
        at java.io.BufferedWriter.flush(BufferedWriter.java:254)
        - locked <0x000000075a610750> (a java.io.OutputStreamWriter)

        at 
com.sun.jersey.core.util.ReaderWriter.writeToAsString(ReaderWriter.java:191)
        at 
com.sun.jersey.core.provider.AbstractMessageReaderWriterProvider.writeToAsString(AbstractMessageReaderWriterProvider.java:128)
        at 
com.sun.jersey.core.impl.provider.entity.StringProvider.writeTo(StringProvider.java:88)
        at 
com.sun.jersey.core.impl.provider.entity.StringProvider.writeTo(StringProvider.java:58)
        at 
com.sun.jersey.spi.container.ContainerResponse.write(ContainerResponse.java:302)
        at 
com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1510)
        at 
com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1419)
        at 
com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1409)
        at 
com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:409)
        at 
com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:558)
        at 
com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:733)

        at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)



This is during slow response times where many threads were opened 
(Tomcat configured with 500). Also, thread dump shows that 240 of tomcat 
threads are in following state which suggests that they are idle.



"http-bio-28080-exec-1230" daemon prio=10 tid=0x00007f812c361800 
nid=0x29a0 waiting on condition [0x00007f810a7e6000]

   java.lang.Thread.State: TIMED_WAITING (parking)
        at sun.misc.Unsafe.park(Native Method)

        - parking to wait for  <0x000000071d193f50> (a 
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
        at 
java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:226)
        at 
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2082)
        at 
java.util.concurrent.LinkedBlockingQueue.poll(LinkedBlockingQueue.java:467)

        at org.apache.tomcat.util.threads.TaskQueue.poll(TaskQueue.java:86)
        at org.apache.tomcat.util.threads.TaskQueue.poll(TaskQueue.java:32)

        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:744)

Any clues would help. Thanks.



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