Re: [GNUnet-developers] How Activemigration works

[Christian Grothoff]

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On Monday 24 March 2003 11:16 am, eric haumant wrote:
Eric's mail got delayed in the spam-filter (and somehow I did not get notified 
that administrator approval is required). Oh well, better late than never :-)

> Hello,
>
> I'm working on benchmaking the activemigration system of GNUnet. And I have
> some question about the way GNUnet refers a block of a file. If all the
> part of a file insterted in GNUnet have been migrate to other nodes, can a
> search request bring back the whole file while the file initial's node is
> unreachable ?

Yes, if all parts have been migrated, this is possible.

> If all the file except the root block have been migrated to other node, is
> the file downloadable while file initial's node is unreachable ?

Well, you could obviously download everything but the root block. But since 
you don't know the root block and since you can not obtain it from the 
network, you will not be able to download anything if the root block is 
missing.

> In fact I don't really understand how the block.c source code works.

Try reading the "Efficient Sharing of Encrypted Data" paper and the 
encoding.php3 webpage. They describe the encoding scheme in detail. 

Christian
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