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From "Scott Stanton (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HTTPCORE-334) https request to a non-responsive but alive port results in a busy loop in one thread
Date Sat, 16 Feb 2013 00:59:14 GMT
Scott Stanton created HTTPCORE-334:
--------------------------------------

             Summary: https request to a non-responsive but alive port results in a busy loop
in one thread
                 Key: HTTPCORE-334
                 URL: https://issues.apache.org/jira/browse/HTTPCORE-334
             Project: HttpComponents HttpCore
          Issue Type: Bug
          Components: HttpCore NIO
    Affects Versions: 4.2.4
         Environment: Windows 8 64-bit
JDK 1.7.0_11
            Reporter: Scott Stanton


Steps to reproduce:

* Start a process that listens on a socket, accepts the connection, but does not read any
data
* In a second processs, establish an https connection 

At this point, one reactor thread will go into a busy loop getting writable events but not
writing any data.  As far as I can tell, this continues indefinitely until either the client
or the server closes the port.  Ideally this scenario would result in no cpu overhead as the
selector should only be waiting for read events if it doesn't have any data to write.  Eventually
it should hit an idle timeout so the client can recover from a non responsive server.

Here is a stack snapshot for the busy thread:

Agent-003 [RUNNABLE, IN_NATIVE] CPU time: 39s
com.yourkit.probes.Table.createRow()
com.yourkit.probes.Table.createRow(int)
com.yourkit.probes.builtin.Sockets$SocketChannel_write_Probe.onEnter(SocketChannel)
sun.nio.ch.SocketChannelImpl.write(ByteBuffer)
org.apache.http.nio.reactor.ssl.SSLIOSession.sendEncryptedData()
org.apache.http.nio.reactor.ssl.SSLIOSession.outboundTransport()
org.apache.http.impl.nio.reactor.AbstractIODispatch.outputReady(IOSession)
org.apache.http.impl.nio.reactor.BaseIOReactor.writable(SelectionKey)
org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvent(SelectionKey)
org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvents(Set)
org.apache.http.impl.nio.reactor.AbstractIOReactor.execute()
org.apache.http.impl.nio.reactor.BaseIOReactor.execute(IOEventDispatch)
org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run()
java.lang.Thread.run()
com.electriccloud.util.EcThread.run()



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