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Re: Hit Metering - report of 0/0

From: Patrick McManus <mcmanus@appliedtheory.com>
Date: Wed, 27 Nov 1996 12:08:43 -0500 (EST)
Message-Id: <199611271708.MAA15469@pat.appliedtheory.com>
To: Jeffrey Mogul <mogul@pa.dec.com>
Cc: mcmanus@appliedtheory.com, http-wg%cuckoo.hpl.hp.com@hplb.hpl.hp.com
X-Mailing-List: <http-wg@cuckoo.hpl.hp.com> archive/latest/1974
In a previous episode Jeffrey Mogul said...
::     In the absence of a specific server request for any minimum return
::     count, the proxy cannot know if the report is worth sending. Some
::     servers may not believe that a return connection is worth the
::     overhead of receiving a 1/0 report, just as some servers may insist
::     on seeing a 0/0 report to know that the proxy's 'best-effort' is
::     succeeding.
:: It would not complicate things too much to add a Meter response-directive
:: along the lines of
:: 	Meter: want-report= MIN/MAX
:: as long as the default was to NOT send this, and that the default
:: MIN is equal to 1 and the default MAX is equal to infinity.

This satisfies my interest in the matter. The only point I might
question in the fact that we have lost the use/re-use granularity in
this response-directive that is maintained elsewhere throughout the
proposal. This breaks that pattern relying on aggregates instead, but
I can't see an alternative short of 3 different directives
(report-use-count, report-reuse-count, report-aggregate-count) and I
don't really like that as an option.

:: I'm really reluctant to add something from the proxy to the server
:: to indicate the proxy's "willingness to report" limits, since it's
:: hard to imagine that a proxy cache with non-infinite disk space
:: could actually guarantee a minimum. 

I'm convinced on this issue. The above mechanism should be sufficient

Patrick R. McManus - Applied Theory Communications -	Software Engineering
http://pat.appliedtheory.com/~mcmanus			Programmer Analyst
mcmanus@AppliedTheory.com	'Prince of Pollywood'	Standards, today!
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Received on Wednesday, 27 November 1996 09:31:57 UTC

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