OnUploadEnd being called twice

[Vinicius Carvalho <vi...@gmail.com>]

Hello there! We have an FTP server running for the last 4 months. It's quite
stable, but a few weeks ago we noticed a strange behavior. When sending
large files (we experienced this with files larger than 100mb). The client
side gets an acknowledge, but on the server side there's an error:

[31/12/09 11:12:45:045 BRST] ERROR
org.apache.ftpserver.impl.DefaultFtpHandler: Exception caught, closing
session
java.io.IOException: Connection reset by peer
    at sun.nio.ch.FileDispatcher.read0(Native Method)
    at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:21)
    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:236)
    at
org.apache.mina.transport.socket.nio.NioProcessor.read(NioProcessor.java:179)
    at
org.apache.mina.transport.socket.nio.NioProcessor.read(NioProcessor.java:41)
    at
org.apache.mina.core.polling.AbstractPollingIoProcessor.read(AbstractPollingIoProcessor.java:585)
    at
org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:563)
    at
org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:552)
    at
org.apache.mina.core.polling.AbstractPollingIoProcessor.access$400(AbstractPollingIoProcessor.java:56)
    at
org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.run(AbstractPollingIoProcessor.java:891)
    at
org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:64)
    at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:619)

And because of this, the onuploadend is called twice. We can reproduce this
with several clients, with large files, on all of them, the error happens.
The problem is that our FTPLet depends on the onuploadend to process the
file sent.

Is there a reason for this? Is there any other info needed to help me on
this?

Regards

-- 
The intuitive mind is a sacred gift and the
rational mind is a faithful servant. We have
created a society that honors the servant and
has forgotten the gift.

Re: OnUploadEnd being called twice

[David Latorre <dv...@gmail.com>]

Hello Vinicius,

 I haven't experienced this error when sending large files; can you
provide us with some more information? Like FTPServer version used,
JVM, OS & machine etc. and any modifications that you made to
FTPServer like a custom file manager. Also, the log file when this
problem occurred (in debug mode) would be helpful.

If nothing of this helps in figuring out the reason of the "Connection
reset by peer" error, you might run a sniffer to see if anything
strange happened.  The problem with onUploadEnd being called twice
should be studied on its own, of course.



2009/12/31 Vinicius Carvalho <vi...@gmail.com>:
> Hello there! We have an FTP server running for the last 4 months. It's quite
> stable, but a few weeks ago we noticed a strange behavior. When sending
> large files (we experienced this with files larger than 100mb). The client
> side gets an acknowledge, but on the server side there's an error:
>
> [31/12/09 11:12:45:045 BRST] ERROR
> org.apache.ftpserver.impl.DefaultFtpHandler: Exception caught, closing
> session
> java.io.IOException: Connection reset by peer
>    at sun.nio.ch.FileDispatcher.read0(Native Method)
>    at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:21)
>    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:236)
>    at
> org.apache.mina.transport.socket.nio.NioProcessor.read(NioProcessor.java:179)
>    at
> org.apache.mina.transport.socket.nio.NioProcessor.read(NioProcessor.java:41)
>    at
> org.apache.mina.core.polling.AbstractPollingIoProcessor.read(AbstractPollingIoProcessor.java:585)
>    at
> org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:563)
>    at
> org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:552)
>    at
> org.apache.mina.core.polling.AbstractPollingIoProcessor.access$400(AbstractPollingIoProcessor.java:56)
>    at
> org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.run(AbstractPollingIoProcessor.java:891)
>    at
> org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:64)
>    at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>    at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>    at java.lang.Thread.run(Thread.java:619)
>
> And because of this, the onuploadend is called twice. We can reproduce this
> with several clients, with large files, on all of them, the error happens.
> The problem is that our FTPLet depends on the onuploadend to process the
> file sent.
>
> Is there a reason for this? Is there any other info needed to help me on
> this?
>
> Regards
>
> --
> The intuitive mind is a sacred gift and the
> rational mind is a faithful servant. We have
> created a society that honors the servant and
> has forgotten the gift.
>