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- Filename: 138-remove-down-routers-from-consensus.txt
- Title: Remove routers that are not Running from consensus documents
- Version: $Revision$
- Last-Modified: $Date$
- Author: Peter Palfrader
- Created: 11-Jun-2008
- Status: Closed
- Implemented-In: 0.2.1.2-alpha
- 1. Overview.
- Tor directory authorities hourly vote and agree on a consensus document
- which lists all the routers on the network together with some of their
- basic properties, like if a router is an exit node, whether it is
- stable or whether it is a version 2 directory mirror.
- One of the properties given with each router is the 'Running' flag.
- Clients do not use routers that are not listed as running.
- This proposal suggests that routers without the Running flag are not
- listed at all.
- 2. Current status
- At a typical bootstrap a client downloads a 140KB consensus, about
- 10KB of certificates to verify that consensus, and about 1.6MB of
- server descriptors, about 1/4 of which it requires before it will
- start building circuits.
- Another proposal deals with how to get that huge 1.6MB fraction to
- effectively zero (by downloading only individual descriptors, on
- demand). Should that get successfully implemented that will leave the
- 140KB compressed consensus as a large fraction of what a client needs
- to get in order to work.
- About one third of the routers listed in a consensus are not running
- and will therefore never be used by clients who use this consensus.
- Not listing those routers will save about 30% to 40% in size.
- 3. Proposed change
- Authority directory servers produce vote documents that include all
- the servers they know about, running or not, like they currently
- do. In addition these vote documents also state that the authority
- supports a new consensus forming method (method number 4).
- If more than two thirds of votes that an authority has received claim
- they support method 4 then this new method will be used: The
- consensus document is formed like before but a new last step removes
- all routers from the listing that are not marked as Running.
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