On Fri, Apr 12, 2002 at 01:28:01PM +1000, Martin Pool wrote: > On 12 Apr 2002, Brian May <[EMAIL PROTECTED]> wrote: > > > I think some more details is required regarding rproxy. [...] > > AFAIK, it solves all the problems regarding server load discussed in > > rsync, doesn't it??? > > Why did you think that? > > rproxy addresses a rather different problem to rsync: for example, it > transfers only one file at a time, not whole directories. No, rproxy > does not have a magic way to do the delta computation in zero time. > Compared to rsync, rproxy has the advantage of cleaner code (imho), > but the disadvantage that no optimization work has been done.
The big problem with rproxy is it's implemented in perl (perl: crypto for algorithms). librsync on the other hand is a nice piece of work and _should_ be used for a re-implementation of rproxy and/or rsync. I have recently got sponsorship to add a python front-end to librsync as an extension to my pysync code, which I should have done by end of next week. After this I will probably do some work on adding rproxy http extensions into something like medusa or twisted. If rproxy includes the signature in a HEAD responce, and supports ranged requests, delta calculation can be moved to the client with no changes to rproxy as follows; 1) client sends HEAD request to get upstream signature. 2) client does reverse-delta calculation. 3) client applies reverse-delta using ranged-requests to fetch required parts from upstream. You touched on this in your page, but not in relation to rproxy. I believe the client-side delta stuff you mentioned was not using rproxy http extensions at all, just adding some sort of cgi that returns signatures for objects on the server. -- ---------------------------------------------------------------------- ABO: finger [EMAIL PROTECTED] for more info, including pgp key ---------------------------------------------------------------------- -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
