RE: DRP and content identifiers.

Jeff's proposal works just fine with globally unique tags, they don't
need to be specifically references. That is kind of the beauty of
e-tags, you just use them. If one is globally unique, so much the
better.
			Yaron

> -----Original Message-----
> From:	Arthur van Hoff [SMTP:avh@marimba.com]
> Sent:	Monday, October 06, 1997 5:35 PM
> To:	Yaron Goland
> Cc:	Jeff Mogul; Push Workshop; DRP Mailing List
> Subject:	Re: DRP and content identifiers.
> 
> Hi Yaron,
> 
> Thanks for the pointer. I was aware of the earlier work done 
> by Jeff Mogul. It is referenced from the DRP proposal because
> it validates a lot of the observations that we have made during
> our work on differential updates here at Marimba. I wasn't aware
> of the HTTP implementation proposal which is described in Jeff
> Mogul's paper. 
> 
> Jeff's proposal is similar to the solution proposed by DRP. Although
> there are a lots of similarities, there are also some differences. 
> The DRP proposal suggests some new HTTP headers, like the
> "Delta-base" header, we suggest the use of "Differential-ID". This,
> combined with the "Content-ID" header gives us a way to make delta 
> caching work on existing HTTP/1.1 servers (the details are described 
> in the DRP proposal). Unfortunately, it appears that defining
> new headers is not acceptable to the HTTP working group, so we are 
> moving away from that.
> 
> One important difference is that we would like to introduce 
> the notion of globally unique entity tags. That will allow
> intermediate proxies identify resources in the cache by content
> rather than just by name and version. We have found that there
> are significant benifits when resources from different locations
> can be substituted when entity tags match. This is often the
> case in software distribution where many applications may contain 
> the same libraries. Although Jeff's proposal doesn't address this
> specifically, it seems that it would be compatible with globally 
> unique entity tags.
> 
> By the way, besides notational differences it seems like the
> two proposals achieve similar goals. I would be happy to use
> Jeff's proposal, if it is accepted. However, I hope we can get
> globally unique entity tags incorporated into it.
> 
> Have fun,
> 
> 	Arthur van Hoff << File: Card for Arthur van Hoff >>

Received on Monday, 6 October 1997 20:38:53 UTC