Re: [9fans] Interested in improving networking in Plan 9

While that sounds interesting and may be useful in its own right, a
centralized server isn't really desirable -- part of the nice thing of
zeroconf is moving to a decentralized environment, and ideally doing
it in a scalable fashion (which isn't trivial on hundreds of thousands
of cores, we certainly don't want unrestricted multicast in such an
environment lest we drown in our own vomit of multicast queries and
responses). Inferno also has a dynamic registry service available as
another example implementation. However -- I think embracing some
internet standards wouldn't be a bad thing -- DNS is certainly an
existing example of an external protocol we support even though we
could have invented our own. Extending the DNS support to mDNS and
DNS-SD shouldn't be that big of a deal -- and most of the hard work is
in defining the Plan 9 interface not actually writing the protocol
support. It would allow us to play nice with other systems, which may
be very beneficial in xcpu environments (which also currently suffers
from a static configuration), and in particular on our Blue Gene work
where front-end nodes are typically Linux or MacOSX workstations.

dns is a bad protocol to build on. it's not really secure
and the security measures are onerous.

not to be confused with a technical argument for or
against building on top of dns, but it's worth noting
that ndb/dns has been pushed just about as far as it
can go. it tends to suffer from cache funnies and
can leak memory.

i'm hoping that i can get a chance to build a thread
library based dns server in the near future.

- erik

.

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