Re: [squid-users] Going into hit-only-mode for 5 minutes... and wrong urls

On 1/08/2012 6:01 p.m., Dmitry Melekhov wrote:
> Hello!
>
> I switched to 3.HEAD-20120627-r12185 from 2.6 two days ago and now I
> see in log something like:
>
>
> 2012/08/01 08:25:48 kid1| Failed to select source for
> 'http://izavia.su/favicon.ico'
> 2012/08/01 08:25:48 kid1| always_direct = DENIED
> 2012/08/01 08:25:48 kid1| never_direct = DENIED
> 2012/08/01 08:25:48 kid1| timedout = 0
> 2012/08/01 08:28:47 kid1| Failure Ratio at 1.017
> 2012/08/01 08:28:47 kid1| Going into hit-only-mode for 5 minutes...
>
>
> Yes, this is situation described in FAQ, but this is just wrong url-
> user mistake, not DNS or connectivity problem.
> Is there any way to avoid this?

It *is* a DNS problem. Out of *all* recent requests 101 out of the last
102 requests failed to resolve or did resolve and TCP conection to them
failed. Regardless of the reason being users pounding your Squid at high
speed with non-existent URLs or connectivity being down - you have a
problem outside of Squid to fix.

It's hard to tell how many requests are required to get the ratio up
over 1.0, should be something like 100 sequential failures with zero
successes of any kind or a 100:1 ration. For now the fix is to prevent
your users doing that.

Amos
Received on Wed Aug 01 2012 - 07:09:48 MDT