Re: I had some troubles with all the changes lately, upgrade and other stuff. need help with this patch review

On 11/5/2012 9:28 PM, Eliezer Croitoru wrote:
> On 11/5/2012 8:03 PM, Alex Rousskov wrote:
>> On 11/05/2012 08:55 AM, Eliezer Croitoru wrote:
>>
>>> As I mentioned about the TCP_SWAP_FAIL_MISSS if someone can explain
>>> literally or give an example of this kind of a case (outside of
>>> store_url) and what should cause it?(I'm a bit confused about it).
>>
>> Does the following explanation help?
>> http://www.squid-cache.org/mail-archive/squid-users/200104/0948.html
>>
>> As for a specific example, I can speculate that manually removing a ufs
>> file corresponding to a cached entry should cause TCP_SWAP_FAIL_MISSS if
>> that entry is later requested and found in store index (but not on disk).
>>
>>
>> HTH,
>>
>> Alex.
>>
> Thanks Alex,
>
> Helped me to settle a bit with my speculations.
> it's kind of weird since I can see that the file is there in the store
> dir and can be accessed.
>
> From what was explained before the store index stores keys and not url,
> am I right?
>
> Based on that what I did was to touch only the key\hash related code.
> Now I'm thinking about the missing store stuff I dont know since from
> ram it works fine.
> The only problem I see is with ufs storage(tested ram and ufs not others).
>
> I understood the problem same as mentioned in the mail-archive since it
> was one of the sources I saw before and also basic review of *some* code.
>
> just throwing into the air, what are the steps when trying to find a
> file in cache and serve it?
> 1. predict the hash of the request.(if store_url present to use it)
> 2. lookup for the hash(get and head..) in the index?(memory? ufs? are
> the same?)
> 3. read the file mentioned in the index from disk? by what?
> (I have seen some code but not sure if it's the point I should look at)
>
> Thanks,
> Eliezer
BUMP
Received on Tue Nov 13 2012 - 17:20:38 MST