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42 lines
1.8 KiB
Plaintext
42 lines
1.8 KiB
Plaintext
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Long and Short Router Descriptors
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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 with
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long descriptors, we'd have to ensure that they stayed in sync with the
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short ones somehow.) We can ensure that the short descriptors are used by
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only recommending those in the network 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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* 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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