Re: Joining squid-dev List

Bug w/ patch for 2.HEAD at:
  http://bugs.squid-cache.org/show_bug.cgi?id=2931

On 18/05/2010, at 4:33 PM, Henrik Nordström wrote:

> tis 2010-05-18 klockan 15:12 +1000 skrev Mark Nottingham:
>
>> /*
>> * The 'need_validation' flag is used to prevent forwarding
>> * loops between siblings. If our copy of the object is stale,
>> * then we should probably only use parents for the validation
>> * request. Otherwise two siblings could generate a loop if
>> * both have a stale version of the object.
>> */
>> r->flags.need_validation = 1;
>>
>> Is the code in Squid3 roughly the same?
>
> Should be.
>
>> I'm tempted to get rid of the need_validation flag, as there are other
>> ways that Squid does loop suppression (e.g., only-if-cached on peer
>> requests, icp_stale_hit). What do people think of this? Is this howyou
>> addressed it.
>
> Don't get rid of the flag, but an option to not skip siblings based on
> it unless the sibling is configured with allow-miss
> (peer->options.allow_miss) is fine.
>
> When using ICP or Digests forwarding loop conditions is quite common,
> triggered by clients sending their own freshness requirements or slight
> difference in configuration between the siblings.
>
> Regards
> Henrik
>
Received on Sat May 22 2010 - 03:54:05 MDT