On Thursday 10 Feb 2011 12:42:25 Volodya wrote: > On 02/10/2011 01:19 PM, Thomas Anderson wrote: > > I am very new to freenet. I read wiki[1] and some doc saying that > > freenet implements dht protocol. > > > > I am going to learn something about dht based on freenet, so I have a > > few questions. > > > > 1st, is it possible for a node (supposed it is located in a data > > center) querying to know if other nodes contain a specific data/ doc > > (maybe search by e.g. file name)? So the node who issues the query > > can, for instance, do a simple counting, such as how many nodes > > currently holds the filename called license.txt. > > > > 2nd, what would the right place (in source code) to start checking the > > dht related stuff? I check out the source code but do not find dht > > related comment or function. Also, freenet wiki search returns `no > > matches for dht'. > > > > I appreciate any advice. > > Thank you. > > > > > > [1]. Wikipedia. > > http://en.wikipedia.org/wiki/Distributed_hash_table#DHT_protocols_and_implementations > > That's not how Freenet works. Everything that is inserted in the global > datastore is first encrypted and error correction is added, it also splits > everything into 32K pieces each of which is inserted separately. > > Therefore it is impossible to search Freenet proper for DHT hash of the > specific > file. Because you only have pieces which are encrypted, and you don't know > what > they mean until you have enough of them and you have also the decryption key. > > Now if you do possess the decryption key, you could, on the Opennet, start > connecting to people's nodes one at the time and send them requests for pieces > that you know comprise that file. > > There's much more, maybe others will help you also.
Right. Freenet is DHT-like but it's not a classic DHT. It's sort of vaguely a heuristic DHT. :) It also distributes files for swarming and redundancy, as VolodyA explained, and no, it doesn't provide a definitive "this key must be on this node" (although there are nodes where it should be stored), nor does it provide a probing operation that doesn't transfer the key.
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