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POP2P overlay networks since 2001?
 

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    <p>What has been happening with the four big P2P distributed hash table (DHT) overlay networks — <strong>Pastry</strong>, <strong>CAN</strong>, <strong>Chord</strong>, and <strong>Tapestry</strong> — since they all came out in 2001? </p> <p>I know that academic projects continued for a few years, and sporadic maintenance releases still appear for some of them, but did any ever end up in major-scale, non-academic use? Is there still an active dev community around any of them?</p> <p>I've take a few journeys through Google and Wikipedia, but there's no real information about what has happened recently, and their web sites are all moribund.</p> <p><strong>Update:</strong> I see that Chimera (the successor to Tapestry) is still under active development, with recent research publications: <a href="http://current.cs.ucsb.edu/projects/chimera/index.html" rel="noreferrer">http://current.cs.ucsb.edu/projects/chimera/index.html</a></p> <p><strong>Update #2:</strong> given someone's -1 for the question, I should be more clear about the programming side - I'm interested in a general-purpose P2P overlay-network library and associated standards that would make a firm foundation for a P2P social networking app. All the existing ones I've looked at, including Chimera, seem too weakly-developed and supported and/or too out-of-date to form a solid infrastructure layer. I'd like to know what other options I have.</p> <p><strong>Update #3:</strong> Mainline DHT seems to generate a few questions here. It's based on Kademlia, and as far as I now, has specialized use mainly as a distributed search protocol for Bittorrent.</p>
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    1. COThis is a perfectly reasonable question, and the OP has clearly done some research. Not sure what the -1 was for, so +1.
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    2. COThe BitTorrent DHT has ~7M nodes, I would say that counts as major-scale use. It's not used for searches as you say though, it's simply a lookup mechanism to find peers participating in a specific swarm (identified by an SHA1 hash). Some other filesharing networks use DHTs too.
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    3. COThe response (or lack thereof) to this question is pretty disappointing. I can hardly believe that the only large scale use of p2p overlays is in bittorrent and the old version of skype... Also, fwiw, chimera's last release seems to be from 2008; hardly active development :/
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