kademlia

Kademlia Implementation in Java

由 青春壹個敷衍的年華 提交于 2019-12-12 04:14:31
问题 I want to setup a Kademlia network to connect peers and build a p2p network. I'm going to distribute processing power of nodes within the network. For network I found this Kademlia Java implemented Setup from git. https://github.com/JoshuaKissoon/Kademlia I want to know how to setup this and use to implement the network. I found that JKademliaNode kad1 = new JKademliaNode("Node1", new KademliaId("ASF45678947584567467"), 7574); JKademliaNode kad2 = new JKademliaNode("Node2", new KademliaId(

How to represent Kademlia distance metric as integer

由 安稳与你 提交于 2019-12-11 12:58:09
问题 I'm new in P2P networking and currently I try to understand some basic things specified by Kademlia papers. The main thing that I cannot understand is Kademlia distance metric. All papers define the distance as XOR of two IDs. The ID size is 160 bits, so the result is also has 160 bits. The question: what is a convenient way to represent this distance as integer? Some implementations, that I checked, use the following: distance = 160 - prefix length (where prefix length is number of leading

DHT Routing Table - Why use Buckets and not a map?

由 帅比萌擦擦* 提交于 2019-12-11 06:37:17
问题 Closest question to this I think. One obvious method of structuring a routing table is to simply maintain a literal table. Map(XOR,Node) Kademlia discusses the use of 'Buckets' which are organised by the most significant bit of the XOR. What is the actual purpose of 'buckets'? Why mess around with 'longest prefix' when we can simply hold the 'actual' XOR as a key in a map? Obviously the map could potentially be 2^160 large, but we could use some heuristics to limit the size of the map, rather

Bittorrent KRPC - Why are node ID's half the size of an info_hash and use every character a-z?

由 随声附和 提交于 2019-12-11 04:58:38
问题 This has seriously perplexed me. The original Kademlia offers that 160bit hex like a sha1 should be used for obvious reasons: When searching for peers relating to an infohash, you simple search nodeIDs as they should be equivalent to the same system as the sha1 infohash. But reading this: http://www.bittorrent.org/beps/bep_0005.html the id's are abcdefghi0123456789 which is: 1) Half the size 2) Uses more characters then standard hex encoding. So what am I missing? Why are node id's like this?

Why does Kademlia use UDP?

由 匆匆过客 提交于 2019-12-11 02:45:48
问题 Why does the Kademlia Distributed Hash Table use UDP as its network transport protocol, even though it's unreliable? 回答1: The main reason is that you rapidly query many nodes that you have never established contact to before and possibly will never see again during a lookup. Kademlia lookups are iterative, i.e. requests won't be forwarded. A forwarding DHT would be more suited to long-standing TCP connections. I.e. a large chunk of the traffic consists a short-lived exchange of a request and

Why does Kademlia structure its routing table how it does?

由 ╄→гoц情女王★ 提交于 2019-12-07 09:23:19
问题 I understand that the Kademlia routing table is made up of 160 buckets. Nodes are put into buckets 0-159, depending on their prefix length (which is the number of leading unset bits in the XOR of the local node key and the node). Why is this so, is there any performance benefits involved (other than the fact that iterating through 160*20 nodes to find the closest is infeasible)?. 回答1: Kademlia uses the XOR of 2 node IDs as a measure of their distance apart. The idea with the routing table

Kademlia routing table and distance metric

由 冷暖自知 提交于 2019-12-07 03:16:32
问题 Its been the first time I read about Kademlia today, and some points I don't think I got them right. The distance between nodes and keys is the xor of their values. So, if I have key x and node y, the distance between them is x xor y. But why what is the point to bucket the nodes I know about and order them by the prefix length ? That doesn't seem to be connected directly with the xor of node IDs to find closests nodes to me ? When I get a request for a value I search in the nodes in the

Adding new nodes to Kademlia, building Kademlia routing tables

由 安稳与你 提交于 2019-12-03 07:52:50
问题 I can't quite wrap my brain around the joining process of Kademlia DHTs. I've seen a few tutorials and presentations online, but they all seem to say things the same way and all psedo code etc is the same in most (actual copy/paste). Can somebody give a high level walk through on this? 回答1: I'm assuming you've read the Kademlia paper. Here's an excerpt from my article An Introduction to Kademlia DHT & How It Works Some background information: When you have a Kademlia network running, there

Adding new nodes to Kademlia, building Kademlia routing tables

由 纵然是瞬间 提交于 2019-12-02 21:20:42
I can't quite wrap my brain around the joining process of Kademlia DHTs. I've seen a few tutorials and presentations online, but they all seem to say things the same way and all psedo code etc is the same in most (actual copy/paste). Can somebody give a high level walk through on this? Joshua Kissoon I'm assuming you've read the Kademlia paper . Here's an excerpt from my article An Introduction to Kademlia DHT & How It Works Some background information: When you have a Kademlia network running, there should always be a node that every other node knows about in order for them to join the

What are the most recent bittorrent DHT implementation recommendations?

由 爷，独闯天下 提交于 2019-12-01 13:25:53
I'm working on implementing yet another bittorrent client and at this time struggling with DHT. It is implemented accordingly to this specification http://www.bittorrent.org/beps/bep_0005.html but starting debugging it I noticed that other nodes' responses on the network vary. For example, find_node is supposed to return either target node info or 8 closest nodes. Most of the nodes reply with 34 closest nodes and usually only 1 - 3 nodes from those 34 successfully reply to the consequent ping request. Is there another document with better implementation recommendation? May be it is already
订阅 kademlia