On ĵaÅ, 2003-02-06 at 20:38, Philipp W. wrote:
> > over occasionally. I'm uncertain what kind of granularity we can get
> > with MySQL's replication; can we leave out the user table (in whole or
> > in part) for instance? Not a big deal if it's just to another of Jimbo's
> > machines, but I'd be leery of shipping e-mail addresses and password
> > hashes over the internet to a third-party mirror site.
>
> mysql supports ssl-encryption, so.... this should't be a problem.
That's only part of the problem; the other part is trusting the mirror
site to maintain privacy and security at least as well as we do on the
main server. I.e. there is an expectation that we will not give out (or
sell!) a user's e-mail address without their consent and knowledge. And
certainly it seems unsafe to toss password hashes around.
If we fully trust the mirrors with thousands of peoples' addys and
passwords, then no problem. If we let anyone mirror willy-nilly, then
I'm rather more concerned.
Hmm...
http://www.mysql.com/doc/en/Replication_Options.html There's an option "replicate-ignore-table" for the *slave*, but as far
as I can tell the smallest granularity we can get for the replicatable
data from the *master* end is "binlog-ignore-db". Unless we move
sensitive user data into its own database, I don't think we can exclude
it.
> > Notes; I'm not sure how much bandwidth would be required just for
> > database traffic, or for updates. I'll check into that tonight. If it's
> > within an internal network, it shouldn't be a problem.
>
> it's about twice the real data, but mysql and ssh supports compression!
The binary update log from the latest server run (about 22:00 to 05:00)
is currently at 46,222,269 bytes. That's an average of about 6 megs per
hour, or 150 megs per day. Gzip compression should take that down a fair
bit. (This is for all languages combined.)
Hmm, note to self: don't gzip the *current* log file to see how big it
is; now updates to it are going into magical deleted file land.
Fortunately we don't need them yet. :) (Actually, I can free up a huge
load of disk space if I just dump the older binlogs; if we set up
replication it'll be from a clean dump.) In any case, it compresses to
about 7 megs, so we might estimate 24 megs per day as a minimum.
As far as traffic between posited separate db and web servers at
Wikipedia Central:
| Bytes_received | 995768056 |
| Bytes_sent | 1471733779 |
| Uptime | 27260 |
That's about 90kb per second average. Should be fine over local network.
-- brion vibber (brion @ pobox.com)