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_posts/2018-12-12-announcing-v0-3.md
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@ -2,7 +2,7 @@
layout: post layout: post
title: "Announcing Yggdrasil Network v0.3" title: "Announcing Yggdrasil Network v0.3"
date: 2018-12-12 00:00:00 -0000 date: 2018-12-12 00:00:00 -0000
author: Neil Alexander author: Neil Alexander, Arceliar
--- ---
### It's finally here ### It's finally here
@ -13,9 +13,10 @@ encrypted and scalable compact routing scheme modelled around the concept of a
global spanning tree. Many concept routing schemes that we have seen to date global spanning tree. Many concept routing schemes that we have seen to date
seem to have problems with scalability - after the network exceeds a certain seem to have problems with scalability - after the network exceeds a certain
size, they either fail to perform or they start to rely on centralised points in size, they either fail to perform or they start to rely on centralised points in
order to consolidate routing information. We wanted to build something that order to consolidate routing information. We want to figure out how to build something that
would not be subject to these limitations and to maintain decentralisation as would not be subject to these limitations, and to maintain decentralisation as
far as possible. To our knowledge, this hasn't quite been achieved before. far as possible, and the best way to test our ideas is to build that network.
To our knowledge, this hasn't quite been achieved before.
Throughout the course of 2018, Yggdrasil has gone from being a very early-stage Throughout the course of 2018, Yggdrasil has gone from being a very early-stage
project supporting only a single platform to a feature-strong and relatively project supporting only a single platform to a feature-strong and relatively
@ -72,12 +73,25 @@ beginning of November about CKR, which explains some more about how to configure
it and how it works. it and how it works.
In the background, we've made a substantial change from using a Kademlia-based In the background, we've made a substantial change from using a Kademlia-based
DHT to a Chord-based DHT. This has some advantages in that a node can bootstrap DHT to a Chord-based DHT. The chord-based appraoch allows us to do lookups with
and start working with far less state information than was needed before. `O(1)` (constant) state, and only depends on additional (`O(logn)`) state as a
Additional state, which we learn about automatically through searches, helps to performance optimization, which allows us to bootstrap more quickly after changes.
speed up DHT lookups. We also believe that using Chord can help us to reduce We also believe that using Chord can help us to reduce some idle DHT chatter
some idle DHT chatter on the network in the future, and to help nodes converge on the network in the future, which will save a little bandwidth, and may be
more quickly when they change their coordinates on the network. helpful on battery-powered devices.
The spanning tree is now constructed a little differently. Previously, in a stable
network, each node would select a new parent only if this reduced the length of
the path to the root of the tree, measured by the number of other Yggdrasil nodes
in the path. This has the virtue of simplicity, but it sometimes leads to poor
performance when a node replaces a few low-latency/high-bandwidth local links with
a comparatively high-latency/low-bandwidth link over the internet (or an anonymous
overlay like [tor](https://github.com/yggdrasil-network/public-peers/blob/master/other/tor.md)
or [i2p](https://github.com/yggdrasil-network/public-peers/blob/master/other/i2p.md)).
Starting with this release, nodes will switch to a new parent if it provides a
consistency lower latency path to the root, and its less eager to immediately switch
again after having just changed parents. This should lead to lower latency in stable
networks, and better reliability in unstable ones.
We've fixed a reasonable number of bugs and crashes, including in the DHT, We've fixed a reasonable number of bugs and crashes, including in the DHT,
switch and ICMPv6 code, and have made a number of additions to the admin socket switch and ICMPv6 code, and have made a number of additions to the admin socket