[tahoe-dev] Node correlations - [Was] best practice for wanting to setup multiple tahoe instances on a single node

[Greg Troxel]

  I'd suggest that a plan of what is needed/wanted is the first step. How do
  we do this? The wiki??? I know you main devs seem to use irc, but I'm not
  in the US, so I can't easily contribute via that medium (i.e. tz issues).

I'd say write up a plan and send it to the list.

  As a first though to be knocked about:
  - can we use the multi-introducer developments to manage node clustering?

I don't see how that helps.  What I think is needed is:

1) Decide if we are going to trust storage nodes to express the
variables that are correlated honestly.  I think it's at least near
impossible not to trust them and make progress.

2) Decide if we are going to have each node express its correlation
state, or put this in the introducer or similar.  I vote for per-node
config.

3) Design a mechanism by which a server node can advertise some
properties to clients, like "location=US/Massachusetts/Cambridge/BBN".
Display this in the WUI, and make it obtainable in the CLI.

4) Design a first-cut protocol for encoding what we care about into
properties.  I sent a zeroth-cut proposal in the previous paragraph :-)

5) Design a way to take a list of nodes with their location properties
and make the peer selector/balancer spiffier.  I think this is replacing
'shares.happy' with a more nuanced claim.   Perhaps just have a way for
people to write their own rules and link it in, and we can experiment
for a while.   A possible rule is "on at least 4 servers that differ in
city".   Or "at least 5 servers, with at least 3 cities, and no 2 of
which share a site".  This rapidly gets messy.  But it can be
individualized code as long as it's easy to write.
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