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From Bill Stoddard <>
Subject Re: mod_proxy reverse proxy optimization/performance question
Date Wed, 20 Oct 2004 15:18:52 GMT
Graham Leggett wrote:

> Roman Gavrilov wrote:
>> In my opinion it would be more efficient to let one process complete 
>> the request (using maximum line throughput) and return some busy code 
>> to other identical, simultaneous requests  until the file is cached 
>> locally.
>> As anyone run into a similar situation? What solution did you find?
> In the original design for mod_cache, the second and subsequent 
> connections to a file that was still in the process of being downloaded 
> into the cache would shadow the cached file - in other words it would 
> serve content from the cached file as and when it was received by the 
> original request.
> The file in the cache was to be marked as "still busy downloading", 
> which meant threads/processes serving from the cached file would know to 
> keep trying to serve the cached file until the "still busy downloading" 
> status was cleared by the initial request. Timeouts would sanity check 
> the process.
> This prevents the "load spike" that occurs just after a file is 
> downloaded anew, but before that download is done.
> Whether this was implemented fully I am not sure - anyone?

It was never implemented.


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