Re: [squid-users] Proactive refreshment in squid

On Thursday 28 August 2003 01.41, Hendy Harsono wrote:
> Hi,
>
> Does squid support proactive refresment?

No.

What probably will be supported in a later Squid version is relaxed
refreshes where Squid will give a slightly old object to some clients
while refreshing cached objects. This will however only make a
difference on frequently accessed object where there is more than one
concurrent request for the same URL as there still will be the
requirement that there is a active client for each refresh (only the
second client while the object is refreshed can be optimized by this
approach).

The problem with proactive refreshes is bandwidth management. All
implementations in other cache servers known to the Squid developers
tends to end up wasting very large amounts of bandwidth on objects
which in the end is never accessed again by the clients, and until a
reasonable approach to avoid this is found the Squid developers does
not find any reason why to implement proactive refreshes in Squid.

Regards
Henrik

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