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