Re: [squid-users] Seeing a lot of RELEASE entries store.log for cache that really shouldn't be releasing much at all.

On 23/07/11 09:49, Dan Ford wrote:
> We have our cache setup in the following manner:
>
> cache_dir ufs /cache_dir 100000 16 256
> refresh_pattern . 10512000 100% 10512000
>
> While testing everything looked good but after putting a bit of load on
> the cache we're seeing a lot of RELEASE entries in the log (non FFFFFFFF
> entries) and I don't understand why this would be the case, since our
> refresh pattern basically says to keep entries in as long as possible.
> The cache isn't being hit with any special expiry or no-cache headers,
> just the User-Agent, Connection, Keep-Alive and Host headers. Here are

The reply header are more relevant to the refresh_pattern. Check what
they are and maybe enable debug level 22,3 to see what refreshCheck is
deciding.

> some examples of the RELEASE messages from our store.log.
>
> 1311359725.359 RELEASE 00 00019ACB 324E9C9538B7DE8EA5D8DCB7925E668B 200
> 1311225933 0 -1 audio/mpeg 80875/80875 GET
> http://10.0.21.15:8080/TranscodingInterface/preview/RABFaaTI
>
> 1311359737.598 RELEASE 00 00015642 312792582E333AD8185F95EDC0C04DCF 200
> 1311264767 0 -1 audio/aac 72865/72865 GET
> http://10.0.21.15:8080/TranscodingInterface/preview/RAC2iWNP
>
> 1311359737.747 RELEASE 00 000198C3 0A560353D2B2F834CE8225F7A429339E 200
> 1311357210 -1 1311457210 x-squid-internal/vary -1/0 GET
> http://10.0.21.15:8080/TranscodingInterface/preview/aHR0cDovL2NvbnRlbnQuOXNxdWFyZWQuY29tL21lZGlhL21wMy9wb2x5LzI3MDg3Ny5tcDM
>
>
> If the content is hit with a different User-Agent will this cause the
> cache to release the object as the result from the origin server will
> differ in size / content with a different User-Agent?

Depends on which user agents are involved with the cached version and
the new request. Whether the new agents details match the Vary: details
the cachesd request was generated from.

Amos

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