[Spread-users] Increasing MAX_GROUP_NAME leads to message header corruption?

[Mike Perik]

Have you rebuilt everything (ie spread daemon, library) with this new size?




--- On Sun, 4/27/08, Sebastian Wrede <swrede at techfak.uni-bielefeld.de> wrote:

> From: Sebastian Wrede <swrede at techfak.uni-bielefeld.de>
> Subject: [Spread-users] Increasing MAX_GROUP_NAME leads to message header corruption?
> To: spread-users at lists.spread.org
> Date: Sunday, April 27, 2008, 11:11 AM
> Hi,
> 
> in order to allow for URIs that map to group names with a
> length that is
> significantly longer than 32 characters, we encode these as
> MD5 hashes. 
> 
> In order to do so, we increased the value of MAX_GROUP_NAME
> by 1 to 33
> characters because it seems that in the default of 32 chars
> the zero
> termination symbol is included. Because spuser now allows
> us to join,
> send to and receive messages from an "MD5" group,
> which it did not
> before this modification I assume the zero termination
> assumption is
> correct, isn't it?
> 
> The issue now is that once we change the group length in
> SpreadConnection.java to 33 characters, too, it is not
> possible to send
> any longer any messages from a java client to the spread
> daemon. As soon
> as the message is written to the socket, an exception
> (broken pipe) is
> thrown. The spread daemon warns about an "Invalid
> Hint" message field,
> probably suggesting that the message protocol seems broken.
> 
> I've already scanned the mail archives for similar
> problems, but could
> not find an appropriate answer. It would be great if anyone
> could point
> us in the right direction to solve this problem.
> 
> BTW: We use spread-4.0.0 on an Ubuntu 7.10 linux
> distribution configured
> for testing purposes with a segment containing only the
> local host. We
> applied the source changes in /include/sp.h
> /daemon/spread_params.h and
> SpreadConnection.java.
> 
> 
> Best regards,
> 
> Sebastian
> 
> 
> -- 
> Dipl.-Inform. Sebastian Wrede                  phone
> +49-521-106-5148
> Research Institute on Cognition and Robotics,
> Bielefeld University, Germany            
> http://www.techfak.uni-bielefeld.de/~swrede/
> 
> 
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