Re: [cks-devl] Sync thoughts (fwd)

[John Goerzen]

"M. Drew Streib" <address@hidden> writes:

> On Tue, Sep 04, 2001 at 02:13:21PM -0400, V Alex Brennen wrote:
>> system A syncs key 12345678 to system B, system B syncs that key to
>> system C, which might then send it to D.  But what if D is configured
>> to sync to A?  Would we have a nasty loop here?
> 
> The answer is no, if A tagged the update with a "BeenThere"/Path style
> header, so that D would realize that A had already seen it and not
> resend. This is how pksd works.

Right.  That's what I was proposing without even knowning that pksd
used it.  VAB, I think that if we consider e-mail syncing only at the
moment, that it could be done entirely without recording anything in
the database on a per-key basis.  Key comes in from e-mail, update
local copy and shove it out to all peers that haven't already seen it,
noting first that we've seen it.  If the key comes in via web or cksd,
send out to all peers if anything updated.

Not sure how the pksd HTTP sync would work since AFAIK there is no
provision for BeenThere in that protocol...

-- John