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From "Joe Hammerbacher (JIRA)" <j...@apache.org>
Subject [jira] [Created] (NET-510) FTPSClient.storeFile() hangs indefinitely if network connection fails
Date Wed, 19 Jun 2013 20:50:19 GMT
Joe Hammerbacher created NET-510:
------------------------------------

             Summary: FTPSClient.storeFile() hangs indefinitely if network connection fails
                 Key: NET-510
                 URL: https://issues.apache.org/jira/browse/NET-510
             Project: Commons Net
          Issue Type: Bug
          Components: FTP
    Affects Versions: 3.3
         Environment: Java 7, CentOS 6.4, commons.net 3.3
            Reporter: Joe Hammerbacher
            Priority: Blocker


Background:

I'm attempting to add some level of fault tolerance to an application that uses FTPSClient
to transfer files. If the connection between the client and server fails, I'd like to capture
the produced exception/return code, log the details, and attempt to reconnect/retry the transfer.

What works:

The retrieveFile() method. If the connection fails, (i.e. I disable the server's public interface),
I receive a CopyStreamException caused by a SocketTimeoutException after the amount of time
I specified as the timeout. Which makes sense if SO_TIMEOUT is getting set correctly...

>From the Javadocs:

"Enable/disable SO_TIMEOUT with the specified timeout, in milliseconds. With this option set
to a non-zero timeout, a read() call on the InputStream associated with this Socket will block
for only this amount of time. If the timeout expires, a java.net.SocketTimeoutException is
raised, though the Socket is still valid. The option must be enabled prior to entering the
blocking operation to have effect. The timeout must be > 0. A timeout of zero is interpreted
as an infinite timeout."

What doesn't work (as expected):

The storeFile() method. If I initiate a transfer via storeFile() and disable the NIC on the
server, the storeFile() method blocks/hangs indefinitely without throwing any exceptions.
I think that this is the result of nothing listening on the DataSocket, which makes sense
because I don't think there is anything being sent back to the client over the DataSocket.


So, it doesn't appear to be possible for the write() to ever timeout if the connection fails.

Am I missing something?

Thanks,

Joe

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