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author | Nick Mathewson <nickm@torproject.org> | 2008-07-02 19:17:51 +0000 |
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committer | Nick Mathewson <nickm@torproject.org> | 2008-07-02 19:17:51 +0000 |
commit | 77ee247de2f368c57816e2cc5d9d747daf7e31d9 (patch) | |
tree | 62388744ce999270a9d4886712a6f4d4a123bfec /proposals/147-prevoting-opinions.txt | |
parent | 369f99df5653bf20052c35ecf5f1cf3641c112dc (diff) | |
download | torspec-77ee247de2f368c57816e2cc5d9d747daf7e31d9.tar.gz torspec-77ee247de2f368c57816e2cc5d9d747daf7e31d9.zip |
r16666@tombo: nickm | 2008-07-02 15:17:46 -0400
Mark 145 and 146 open (oops). Add new proposal 147 about making v2 directories less needed.
svn:r15607
Diffstat (limited to 'proposals/147-prevoting-opinions.txt')
-rw-r--r-- | proposals/147-prevoting-opinions.txt | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/proposals/147-prevoting-opinions.txt b/proposals/147-prevoting-opinions.txt new file mode 100644 index 0000000..db66d3e --- /dev/null +++ b/proposals/147-prevoting-opinions.txt @@ -0,0 +1,54 @@ +Filename: 147-prevoting-opinions.txt +Title: Eliminate the need for v2 directories in generating v3 directories +Version: $Revision$ +Last-Modified: $Date$ +Author: Nick Mathewson +Created: 2-Jul-2008 +Status: Open + +Overview + + We propose a new v3 vote document type to replace the role of v2 + networkstatus information in generating v3 consensuses. + +Motivation + + When authorities vote on which descriptors are to be listed in the + next consensus, it helps if they all know about the same descriptors + as one another. But a hostile, confused, or out-of-date server may + upload a descriptor to only some authorities. In the current v3 + directory design, the authorities don't have a good way to tell one + another about the new descriptor until they exchange votes... but by + the time this happens, they are already committed to their votes, + and they can't add anybody they learn about from other authorities + until the next voting cycle. That's no good! + + The current Tor implementation avoids this problem by having + authorities also look at v2 networkstatus documents, but we'd like + in the long term to eliminate these, once 0.1.2.x is obsolete. + +Design: + + We add a new value for vote-status in v3 consensus documents in + addition to "consensus" and "vote": "opinion". Authorities generate + and sign an opinion document as if they were generating a vote, + except that they send it to one another earlier than they send + votes. + + Authorities don't need to generate more than one opinion document + per voting interval, but may. They should send it to the other + authorities they know about, at the regular vote upload URL, before + the authorities begin voting, so that enough time remains for the + authorities to fetch new descriptors. + + Upon receiving an opinion document, authorities scan it for any + descriptors that: + - They might accept. + - Are for routers they don't know about, or are published more + recently than any descriptor they have for that router. + Authorities then begin downloading such descriptors from authorities + that claim to have them. + + Authorities MAY cache opinion documents, but don't need to. + + |