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60 lines
2.2 KiB
Plaintext
60 lines
2.2 KiB
Plaintext
Filename: 104-short-descriptors.txt
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Title: Long and Short Router Descriptors
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Version: $Revision$
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Last-Modified: $Date$
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Author: Nick Mathewson
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Created:
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Status: Open
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Overview:
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This document proposes moving unused-by-clients information from regular
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router descriptors into a special "long form" router descriptor.
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It presents options; it is not yet a complete proposal.
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Proposal:
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Some of the costliest fields in the current directory protocol are ones
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that no client actually uses. In particular, the "read-history" and
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"write-history" fields are used only by the authorities for monitoring the
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status of the network. If we took them out, the size of a compressed list
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of all the routers would fall by about 60%. (No other disposable field
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would save more than 2%.)
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One possible solution here is that routers should generate and upload a
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short-form and long-form descriptor. Only the short-form descriptor should
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ever be used by anybody for routing. The long-form descriptor should be
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used only for analytics and other tools. (If we allowed people to route
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with long descriptors, we'd have to ensure that they stayed in sync with
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the short ones somehow. So let's not do that.) We can ensure that the
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short descriptors are used by only recommending those in the network
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statuses.
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Another possible solution would be to drop these fields from descriptors,
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and have them uploaded as a part of a separate "bandwidth report" to the
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authorities. This could help prevent the mistake of using long descriptors
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in the place of short ones.
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Thoughts? -NM
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Migration:
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For long/short descriptors:
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* In 0.1.2.x:
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* Add a "long version" URL that tools can start using now. Need to
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design it first.
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* In 0.1.2.x:
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* Authorities should accept both, now, and silently drop short
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descriptors.
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* Routers should upload both once authorities accept them.
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* There should be a "long descriptor" url and the current "normal" URL.
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Authorities should serve long descriptors from both URLs.
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* Once tools that want long descriptors support fetching them from the
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"long descriptor" URL:
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* Have authorities remember short descriptors, and serve them from the
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'normal' URL.
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