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From "John Hearn (JIRA)" <j...@apache.org>
Subject [jira] Created: (FTPSERVER-260) IOException under high load
Date Thu, 08 Jan 2009 16:04:59 GMT
IOException under high load
---------------------------

                 Key: FTPSERVER-260
                 URL: https://issues.apache.org/jira/browse/FTPSERVER-260
             Project: FtpServer
          Issue Type: Bug
          Components: Core
    Affects Versions: 1.0.0-M4, 1.0.0-M3
         Environment: Windows XP SP3
            Reporter: John Hearn


Under high load I noticed that strange IOExceptions started appearing in the server log:

java.io.IOException: Se ha anulado una conexión establecida por el software en su equipo
host.
	at sun.nio.ch.SocketDispatcher.read0(Native Method)
	at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:25)
	at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:233)
	at sun.nio.ch.IOUtil.read(IOUtil.java:206)
	at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:207)
	at org.apache.mina.transport.socket.nio.NioProcessor.read(NioProcessor.java:175)
	at org.apache.mina.transport.socket.nio.NioProcessor.read(NioProcessor.java:42)
	at org.apache.mina.core.polling.AbstractPollingIoProcessor.read(AbstractPollingIoProcessor.java:561)
	at org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:540)
	at org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:532)
	at org.apache.mina.core.polling.AbstractPollingIoProcessor.access$400(AbstractPollingIoProcessor.java:58)
	at org.apache.mina.core.polling.AbstractPollingIoProcessor$Worker.run(AbstractPollingIoProcessor.java:857)
	at org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:51)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
	at java.lang.Thread.run(Thread.java:595)

(The message is in spanish because I am in Spain. I believe the exception in english is "Software
caused connection abort" but I may be wrong).  

I couldn't find a related bug so as a test I set up a JMeter test rig with a Thread Group
and a basic (passive) FTP Request (user admin, RETR README.txt). Sure enough when I increase
the concurrent threads this error starts appearing. In fact the error can appear occacionally
with a single thread downloading many files consecutively.

I have tried this with the latest versions of both JMeter and FtpServer and the error is the
same.


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